[REGRESSION] Hang during backup with rsync

[REGRESSION] Hang during backup with rsync

[Martin Steigerwald]

Hi!

With Linux 4.0 I had a hang while backuping /home with my still rsync
based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
with one big BTRFS via Expresscard eSATA controller from Delock.

The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
no effect. I waited for a minute at least. Maybe it would have reacted after
a longer time, but I wanted my machine back. Disks where idle, if I remember
correctly. After reboot both filesystems mount okay.


Label: 'home'  uuid: 
        Total devices 2 FS bytes used 129.46GiB
        devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
        devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home

Label: 'steigerwald'
        Total devices 1 FS bytes used 1.18TiB
        devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1

merkaba:~> btrfs fi df /home
Data, RAID1: total=142.00GiB, used=126.70GiB
System, RAID1: total=32.00MiB, used=48.00KiB
Metadata, RAID1: total=4.00GiB, used=2.76GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

merkaba:~> btrfs fi df /mnt/steigerwald 
Data, single: total=1.34TiB, used=1.17TiB
System, DUP: total=8.00MiB, used=168.00KiB
System, single: total=4.00MiB, used=0.00B
Metadata, DUP: total=25.00GiB, used=11.17GiB
Metadata, single: total=8.00MiB, used=0.00B
GlobalReserve, single: total=512.00MiB, used=0.00B


I got this in kern.log:

Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!
Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP 
Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6 
Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0 
Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP 
Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7 
Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
Apr 30 17:58:47 merkaba kernel: [145040.868238] 
Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015



I unplugged and replugged the controller + cable several times before,
as I was not sure whether it was seated properly, and during this I got:

Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)

I didn´t see anything BTRFS related in there and am not sure whether it is
to the BTRFS hang.


I think I will try this tomorrow, cause, hey, I want to update my backup!

For safety I will run a scrub now.

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±ý»k~ÏâžØ^n‡r¡ö¦zË\x1aëh™¨è­Ú&£ûàz¿äz¹Þ—ú+€Ê+zf£¢·hšˆ§~†­†Ûiÿÿïêÿ‘êçz_è®\x0fæj:+v‰¨þ)ߣøm

Re: [REGRESSION] Hang during backup with rsync

[Duncan]

Martin Steigerwald posted on Thu, 30 Apr 2015 19:29:57 +0200 as excerpted:

> The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
> no effect. I waited for a minute at least. Maybe it would have reacted
> after a longer time, but I wanted my machine back. Disks where idle, if
> I remember correctly. After reboot both filesystems mount okay.

This response is in regard to what to do at an apparent hang, and has 
nothing directly to do with btrfs...

Two comments:

1) Depending on your graphics hardware and driver config, a modern 
"KMS" (kernel modesetting) setup is more likely to "soft" hang in X mode 
and not switch back to text mode, even when the system is otherwise not 
hung and a VT switch would have worked fine pre-KMS-era.

While I'm no kernel or graphics expert, the problem from here /seems/ to 
be that a modern KMS kernel generally uses high-res framebuffer mode at 
the CLI as well, and because the basic kernel handling is unified 
framebuffer and kernel-mode-switching for both X and CLI modes, switching 
from X to CLI doesn't involve switching to the entirely separate VGA mode 
driver and with it the forced hardware reset that it used to.  Without 
that driver switch and forced reset, even if the switch actually occurs 
successfully in terms of what you might type, what is actually displayed 
may remain frozen, such that if you only have a local session, you 
generally have to reboot anyway, but if you already have a CLI login 
going in the VT you tried to switch to or can login blind, sometimes you 
can at least manage a controlled reboot, by doing an init 6 or systemctl 
reboot or whatever, even if the display is frozen and shows nothing.  Of 
course it doesn't always work, but given the chance to avoid an unclean 
shutdown, try it and see.

So no response at an attempted VT switch (your ctrl-alt-F1) doesn't mean 
what it used to...

2) Along the same lines, there's the kernel's magic-sysrequest (sysrq/srq) 
functionality.  Assuming you have it enabled in your kernel, you can try 
a series of alt-sysrq-key sequences and very possibly use that to avoid 
an entirely uncontrolled shutdown, even when major functionality upto and 
including all of userspace is non-functional.

There's enough explanations written and googlable on the subject that 
I'll avoid a full explanation here, but the main point I have to make is 
that in addition to often allowing a semi-controlled shutdown/reboot, by 
using the keys in the prescribed sequence and noting at which point (if 
any) you actually get a response, you get at least some indication of how 
badly your system was actually locked up.

What I'd try first, right after the VT switch didn't work, is alt-srq-k.  
Called the secure-term sequence as it can be used to help avoid suspected 
keyloggers of certain (but not all) types, this tells the kernel to force-
kill anything running on your current VT and reset it.  This can be used 
to kill an unresponsive X, for instance, and normally you'll get 
automatically switched to a CLI login, either due to automatic switching 
back to a previous VT (in the case of X on its own VT), or to automatic 
respawning of the login after the kernel kills it along with whatever 
else you were doing if you were already at the CLI.

This alt-srq-k sequence is thus a good first fallback if ctrl-alt-Fx 
appears to do nothing, since it apparently forces the VT reset that 
switching to a VGAmode CLI used to, that switching to a KMS mode CLI 
doesn't.

If that doesn't work, it's time for the usual REISUB sequence,

* alt-srq-r (unraw the input, take out of X mode)

* alt-srq-e (tErminate, aka SIGTERM, all of userspace, allowing anything 
still alive to terminate gracefully if it can)

* alt-srq-i (kIll, aka SIGKILL, all userspace, forcefully killing 
anything that ignored the SIGTERM but still allowing the kernel to do 
normal cleanup if it can)

(Tho from my own experience, if the K and R sequences don't help, then 
the E and I sequences aren't likely to do much either, as they're 
probably locked up bad enough that nothing will be gained, but OTOH, 
nothing is lost by trying them, either.)

* alt-srq-s (Sync, force an emergency sync to storage of anything still 
write-cached)

alt-srq-s can be used at any time, without disrupting normal operation 
except for any I/O triggered by the forced sync.  I've come to use it 
regularly immediately before I do anything that I think /might/ trigger 
system instability, so everything's synced before I try it, just in 
case.  Think of this as a forced version of the sync command.

* alt-srq-u (remoUnt read-only, forcing all still functional filesystems 
read-only)

The S and U steps are critical to a semi-controlled shutdown, and where 
they work, can often mean the difference between a filesystem with no 
errors on reboot as the kernel saved and cleanly mounted read-only to the 
extent it could, and various filesystem corruptions, if these steps 
weren't done or if the kernel was badly enough corrupted it was afraid to 
write anything lest it make the problem worse.

* alt-srq-b (reBoot, force a reboot without any further cleanup).


Now:

* If the K/secure-term doesn't work you know there's some issue.  Often 
this can be graphics related, if the other steps work.

* Normally, on issue of the S/sync, you'll see a burst of storage device 
activity as the kernel syncs all dirty writebuffers.  If you have the 
common storage device activity LED, you'll see it there.

If you don't see activity on the S/sync and/or U/remoUnt steps, you know 
the system is pretty far dead, and can expect filesystem errors on reboot.

* Finally, if the kernel responds to the B/reBoot step, but you did *NOT* 
see activity at the S and/or U steps, then you know that the kernel was 
still alive enough to respond to magic-srq and do the reboot, but that it 
thought itself corrupted and thus feared to write to storage for the sync 
and remount steps as it couldn't guarantee it wouldn't scribble somewhere 
other than where it should be writing, thus risking corrupting things 
even worse than an unclean shutdown might.


So, when I see descriptions of apparent system hangs such as yours, 
above, a big thing I look for is whether the K/REISUB magic-srq sequences 
were tried, and if so, at which step, if any, the kernel responded.

* If the user was in X and the secure-term K sequence worked, the problem 
wasn't too bad, and may have been a graphics system issue.

* If the S and R sequences worked, then the problem was worse, but either 
wasn't storage related, or at least was minor enough that the kernel felt 
it safe to sync and remount.

* If only the B sequence responded, then at least the kernel was still 
alive, but it considered the situation serious enough that it dare not do 
the sync/remount writes lest it risk scribbling on other partitions, etc.

* If not even the B sequence responded, then the kernel was effectively 
dead as well, and the problem was very serious indeed!

Unfortunately, the above hang description doesn't mention trying magic 
sysrq at all, and assuming you didn't try them, not only did you 
potentially needlessly endanger your data (if the S/R steps would have 
worked), but now we are missing that key bit of information about how 
badly the kernel /itself/ thought things were.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

Re: [REGRESSION] Hang during backup with rsync

[Martin Steigerwald]

Am Donnerstag, 30. April 2015, 19:29:57 schrieb Martin Steigerwald:
> Hi!
> 
> With Linux 4.0 I had a hang while backuping /home with my still rsync
> based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
> with one big BTRFS via Expresscard eSATA controller from Delock.
> 
> The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
> no effect. I waited for a minute at least. Maybe it would have reacted after
> a longer time, but I wanted my machine back. Disks where idle, if I remember
> correctly. After reboot both filesystems mount okay.

I ran a scrub on both volumes and they are both okay.

Is it possible from the backtraces to see on which volume / filesystem BTRFS hung?

Thanks,
Martin
 
> Label: 'home'  uuid: 
>         Total devices 2 FS bytes used 129.46GiB
>         devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
>         devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home
> 
> Label: 'steigerwald'
>         Total devices 1 FS bytes used 1.18TiB
>         devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1
> 
> merkaba:~> btrfs fi df /home
> Data, RAID1: total=142.00GiB, used=126.70GiB
> System, RAID1: total=32.00MiB, used=48.00KiB
> Metadata, RAID1: total=4.00GiB, used=2.76GiB
> GlobalReserve, single: total=512.00MiB, used=0.00B
> 
> merkaba:~> btrfs fi df /mnt/steigerwald 
> Data, single: total=1.34TiB, used=1.17TiB
> System, DUP: total=8.00MiB, used=168.00KiB
> System, single: total=4.00MiB, used=0.00B
> Metadata, DUP: total=25.00GiB, used=11.17GiB
> Metadata, single: total=8.00MiB, used=0.00B
> GlobalReserve, single: total=512.00MiB, used=0.00B
> 
> 
> I got this in kern.log:
> 
> Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
> Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
> Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
> Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
> Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
> Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
> Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
> Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
> Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
> Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
> Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
> Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
> Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
> Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
> Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
> Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
> Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
> Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
> Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
> Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
> Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
> Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!
> Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP 
> Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
> Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
> Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
> Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
> Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
> Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
> Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
> Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
> Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
> Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
> Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
> Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
> Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6 
> Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
> Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
> Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
> Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0 
> Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP 
> Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
> Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
> Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
> Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
> Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
> Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
> Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
> Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
> Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
> Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
> Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
> Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
> Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
> Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
> Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7 
> Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
> Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
> Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
> Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
> Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
> Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.868238] 
> Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
> Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
> Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
> Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
> Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
> Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
> Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
> Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
> Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
> Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
> Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
> Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
> Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
> Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
> Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
> Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
> Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
> Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
> Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
> Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
> Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
> Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
> Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
> Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
> Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
> Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
> Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
> Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
> Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
> Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
> Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
> Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
> Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
> Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
> Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
> Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
> Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015
> 
> 
> 
> I unplugged and replugged the controller + cable several times before,
> as I was not sure whether it was seated properly, and during this I got:
> 
> Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
> Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
> Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
> Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
> Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
> Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
> Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
> Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
> Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
> Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
> Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
> Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
> Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
> Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
> Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
> Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
> Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> 
> I didn´t see anything BTRFS related in there and am not sure whether it is
> to the BTRFS hang.
> 
> 
> I think I will try this tomorrow, cause, hey, I want to update my backup!
> 
> For safety I will run a scrub now.
> 
> Ciao,
> 

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±ý»k~ÏâžØ^n‡r¡ö¦zË\x1aëh™¨è­Ú&£ûàz¿äz¹Þ—ú+€Ê+zf£¢·hšˆ§~†­†Ûiÿÿïêÿ‘êçz_è®\x0fæj:+v‰¨þ)ߣøm

Re: [REGRESSION] Hang during backup with rsync

[Martin Steigerwald]

Am Freitag, 1. Mai 2015, 01:48:23 schrieb Duncan:
> Martin Steigerwald posted on Thu, 30 Apr 2015 19:29:57 +0200 as 
excerpted:
> > The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1
> > had
> > no effect. I waited for a minute at least. Maybe it would have reacted
> > after a longer time, but I wanted my machine back. Disks where idle,
> > if
> > I remember correctly. After reboot both filesystems mount okay.
> 
> This response is in regard to what to do at an apparent hang, and has
> nothing directly to do with btrfs...
> 
> Two comments:
> 
> 1) Depending on your graphics hardware and driver config, a modern
> "KMS" (kernel modesetting) setup is more likely to "soft" hang in X mode
> and not switch back to text mode, even when the system is otherwise not
> hung and a VT switch would have worked fine pre-KMS-era.
> 
> While I'm no kernel or graphics expert, the problem from here /seems/ to
> be that a modern KMS kernel generally uses high-res framebuffer mode at
> the CLI as well, and because the basic kernel handling is unified
> framebuffer and kernel-mode-switching for both X and CLI modes,
> switching from X to CLI doesn't involve switching to the entirely
> separate VGA mode driver and with it the forced hardware reset that it
> used to.  Without that driver switch and forced reset, even if the
> switch actually occurs successfully in terms of what you might type,
> what is actually displayed may remain frozen, such that if you only
> have a local session, you generally have to reboot anyway, but if you
> already have a CLI login going in the VT you tried to switch to or can
> login blind, sometimes you can at least manage a controlled reboot, by
> doing an init 6 or systemctl reboot or whatever, even if the display is
> frozen and shows nothing.  Of course it doesn't always work, but given
> the chance to avoid an unclean shutdown, try it and see.
> 
> So no response at an attempted VT switch (your ctrl-alt-F1) doesn't mean
> what it used to...

I never read this. Also it is not obvious to me why a hardware reset would 
be needed if the embedded Intel gfx is initialized properly already. I do 
not believe that it was the GPU that hang.

I assume a simpler explaination: that X.org process was in D state and 
thus not able to respond to the keypress anymore. Or that the kernel was 
stuck in a way that it didn´t do anything anymore. Next time I may try a 
ping to the machine from my other laptop, cause from my experience in that 
case it doesn´t even respond to a ping anymore.

> 2) Along the same lines, there's the kernel's magic-sysrequest
> (sysrq/srq) functionality.  Assuming you have it enabled in your
> kernel, you can try a series of alt-sysrq-key sequences and very
> possibly use that to avoid an entirely uncontrolled shutdown, even when
> major functionality upto and including all of userspace is
> non-functional.

I didn´t try these, although I am aware they exist. I didn´t think of it 
and I didn´t memorize them. Maybe I dig for some kind of a reference card 
to stick to somewhere I can look up in that case.

Thing is, I wanted to have the machine back. Now. So I did the quickest 
way out. Yet, I still wanted to report what I could gather easily enough 
in a short time.

Thank you for your detailed explaination. I may just print your mail as a 
reference :)

But I had the plan that for the next backup attempt, I will quit X11 and 
have it running on TTY1, while also logging into TTY2 and TTY3 or to 
possible be able to issue some commands to gather further debug 
information. For that those sysrq combinations may be helpful.

> So, when I see descriptions of apparent system hangs such as yours,
> above, a big thing I look for is whether the K/REISUB magic-srq
> sequences were tried, and if so, at which step, if any, the kernel
> responded.
> 
> * If the user was in X and the secure-term K sequence worked, the
> problem wasn't too bad, and may have been a graphics system issue.
> 
> * If the S and R sequences worked, then the problem was worse, but
> either wasn't storage related, or at least was minor enough that the
> kernel felt it safe to sync and remount.
> 
> * If only the B sequence responded, then at least the kernel was still
> alive, but it considered the situation serious enough that it dare not
> do the sync/remount writes lest it risk scribbling on other partitions,
> etc.
> 
> * If not even the B sequence responded, then the kernel was effectively
> dead as well, and the problem was very serious indeed!
> 
> Unfortunately, the above hang description doesn't mention trying magic
> sysrq at all, and assuming you didn't try them, not only did you
> potentially needlessly endanger your data (if the S/R steps would have
> worked), but now we are missing that key bit of information about how
> badly the kernel /itself/ thought things were.

While I do think that these key combination can be helpful for further 
debugging I doubt they would have done anything for ensuring data 
integrity, cause…

… BTRFS was hung. And from my past experiences a issueing "sync" command 
from the shell, when it was still possible, just got the process of the 
"sync" command into D state and that was it.

When this happens usually after some time various parts of the KDE desktop 
stop responding as their processes try to write data to the BTRFS 
filesystem and get stuck in uninterruptible sleep.

Journaling and copy on write filesystems are supposed to deal with sudden 
interruption write operation just fine and it is a bug if they are 
corrupted afterwards. Only risk would be unwritten stuff, but, well, as I 
assumed BTRFS was frozen, and the backtraces seem to suggest that as well, 
it probably wouldn´t have written a single bit anyway anymore, unless I 
wait for it to eventually come out of the hang after some time. And this 
is the time I didn´t want to invest at that moment.

What was new this time compared to a regular BTRFS hang as they still 
happen when BTRFS allocated all space of the devices into chunks, that 
even the mouse pointer was frozen. Also here, clearly not all space of the 
devices was allocated into chunks, so what I have seen is a different 
issue.

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

Re: [REGRESSION] Hang during backup with rsync

[Filipe David Manana]

On Thu, Apr 30, 2015 at 6:29 PM, Martin Steigerwald <martin@lichtvoll.de> wrote:
> Hi!
>
> With Linux 4.0 I had a hang while backuping /home with my still rsync
> based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
> with one big BTRFS via Expresscard eSATA controller from Delock.
>
> The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
> no effect. I waited for a minute at least. Maybe it would have reacted after
> a longer time, but I wanted my machine back. Disks where idle, if I remember
> correctly. After reboot both filesystems mount okay.
>
>
> Label: 'home'  uuid:
>         Total devices 2 FS bytes used 129.46GiB
>         devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
>         devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home
>
> Label: 'steigerwald'
>         Total devices 1 FS bytes used 1.18TiB
>         devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1
>
> merkaba:~> btrfs fi df /home
> Data, RAID1: total=142.00GiB, used=126.70GiB
> System, RAID1: total=32.00MiB, used=48.00KiB
> Metadata, RAID1: total=4.00GiB, used=2.76GiB
> GlobalReserve, single: total=512.00MiB, used=0.00B
>
> merkaba:~> btrfs fi df /mnt/steigerwald
> Data, single: total=1.34TiB, used=1.17TiB
> System, DUP: total=8.00MiB, used=168.00KiB
> System, single: total=4.00MiB, used=0.00B
> Metadata, DUP: total=25.00GiB, used=11.17GiB
> Metadata, single: total=8.00MiB, used=0.00B
> GlobalReserve, single: total=512.00MiB, used=0.00B
>
>
> I got this in kern.log:
>
> Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
> Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
> Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
> Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
> Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
> Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
> Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
> Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
> Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
> Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
> Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
> Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
> Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
> Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
> Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
> Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
> Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
> Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
> Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
> Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
> Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
> Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/fs/btrfs/extent_io.c?id=refs/tags/v4.0.1#n4551

line 4551 -> BUG_ON(extent_buffer_under_io(eb));

Fixed recently by https://patchwork.kernel.org/patch/6261421/

And no, it's not a recent regression. Problem goes back to 2012, it's
just a very hard to hit race.



> Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP
> Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
> Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
> Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
> Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
> Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
> Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
> Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
> Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
> Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
> Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
> Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
> Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
> Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6
> Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
> Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
> Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
> Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0
> Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP
> Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
> Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
> Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
> Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
> Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
> Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
> Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
> Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
> Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
> Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
> Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
> Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
> Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
> Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
> Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7
> Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
> Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
> Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
> Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
> Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
> Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.868238]
> Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
> Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
> Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
> Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
> Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
> Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
> Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
> Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
> Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
> Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
> Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
> Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
> Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
> Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
> Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
> Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
> Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
> Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
> Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
> Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
> Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
> Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
> Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
> Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
> Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
> Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
> Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
> Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
> Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
> Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
> Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
> Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
> Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
> Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
> Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
> Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
> Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
> Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
> Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
> Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
> Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
> Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015
>
>
>
> I unplugged and replugged the controller + cable several times before,
> as I was not sure whether it was seated properly, and during this I got:
>
> Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
> Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
> Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
> Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
> Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
> Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
> Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
> Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
> Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
> Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
> Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
> Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
> Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
> Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
> Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
> Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
> Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
> Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
> Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
>
> I didn´t see anything BTRFS related in there and am not sure whether it is
> to the BTRFS hang.
>
>
> I think I will try this tomorrow, cause, hey, I want to update my backup!
>
> For safety I will run a scrub now.
>
> Ciao,
> --
> Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7



-- 
Filipe David Manana,

"Reasonable men adapt themselves to the world.
 Unreasonable men adapt the world to themselves.
 That's why all progress depends on unreasonable men."

Re: [BUG] Hang during backup with rsync

[Martin Steigerwald]

Am Freitag, 1. Mai 2015, 11:30:10 schrieb Filipe David Manana:
> On Thu, Apr 30, 2015 at 6:29 PM, Martin Steigerwald <martin@lichtvoll.de> wrote:
> > Hi!
> >
> > With Linux 4.0 I had a hang while backuping /home with my still rsync
> > based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
> > with one big BTRFS via Expresscard eSATA controller from Delock.
> >
> > The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
> > no effect. I waited for a minute at least. Maybe it would have reacted after
> > a longer time, but I wanted my machine back. Disks where idle, if I remember
> > correctly. After reboot both filesystems mount okay.
> >
> >
> > Label: 'home'  uuid:
> >         Total devices 2 FS bytes used 129.46GiB
> >         devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
> >         devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home
> >
> > Label: 'steigerwald'
> >         Total devices 1 FS bytes used 1.18TiB
> >         devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1
> >
> > merkaba:~> btrfs fi df /home
> > Data, RAID1: total=142.00GiB, used=126.70GiB
> > System, RAID1: total=32.00MiB, used=48.00KiB
> > Metadata, RAID1: total=4.00GiB, used=2.76GiB
> > GlobalReserve, single: total=512.00MiB, used=0.00B
> >
> > merkaba:~> btrfs fi df /mnt/steigerwald
> > Data, single: total=1.34TiB, used=1.17TiB
> > System, DUP: total=8.00MiB, used=168.00KiB
> > System, single: total=4.00MiB, used=0.00B
> > Metadata, DUP: total=25.00GiB, used=11.17GiB
> > Metadata, single: total=8.00MiB, used=0.00B
> > GlobalReserve, single: total=512.00MiB, used=0.00B
> >
> >
> > I got this in kern.log:
> >
> > Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
> > Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
> > Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
> > Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
> > Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
> > Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
> > Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
> > Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
> > Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
> > Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
> > Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
> > Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
> > Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
> > Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
> > Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> > Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> > Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
> > Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
> > Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
> > Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
> > Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
> > Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
> > Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
> > Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!
> 
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/fs/btrfs/extent_io.c?id=refs/tags/v4.0.1#n4551
> 
> line 4551 -> BUG_ON(extent_buffer_under_io(eb));
> 
> Fixed recently by https://patchwork.kernel.org/patch/6261421/
> 
> And no, it's not a recent regression. Problem goes back to 2012, it's
> just a very hard to hit race.

Wonderful. Thanks, Filipe.

So chances are when I run the backup again it will run through nicely?

Will this change be in 4.1-rc2? I don´t see it in git log from Linus tree so far.

Otherwise I would apply it manually.

Thanks,
Martin

> > Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP
> > Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> > Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
> > Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
> > Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
> > Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
> > Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
> > Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
> > Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> > Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
> > Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
> > Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
> > Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
> > Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
> > Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
> > Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6
> > Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
> > Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
> > Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
> > Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0
> > Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP
> > Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> > Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
> > Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
> > Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
> > Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
> > Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
> > Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
> > Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> > Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
> > Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
> > Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
> > Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
> > Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
> > Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
> > Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> > Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> > Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
> > Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
> > Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> > Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> > Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> > Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> > Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> > Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7
> > Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
> > Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
> > Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
> > Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
> > Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
> > Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.868238]
> > Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
> > Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
> > Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
> > Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
> > Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> > Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
> > Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
> > Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
> > Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
> > Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
> > Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
> > Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
> > Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
> > Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
> > Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
> > Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
> > Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
> > Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
> > Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> > Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> > Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
> > Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
> > Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> > Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> > Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> > Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> > Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> > Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
> > Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
> > Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
> > Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
> > Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
> > Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
> > Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
> > Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
> > Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
> > Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
> > Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
> > Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> > Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
> > Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
> > Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
> > Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
> > Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
> > Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
> > Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015
> >
> >
> >
> > I unplugged and replugged the controller + cable several times before,
> > as I was not sure whether it was seated properly, and during this I got:
> >
> > Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> > Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
> > Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> > Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
> > Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> > Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> > Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
> > Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
> > Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
> > Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
> > Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> > Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> > Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> > Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> > Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> > Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> > Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> > Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> > Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> > Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> > Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> > Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> > Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> > Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> > Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> > Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> > Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
> > Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> > Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
> > Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
> > Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> > Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
> > Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> > Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
> > Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> > Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> > Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
> > Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
> > Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
> > Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
> > Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> > Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> > Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> > Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> > Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> > Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> > Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> > Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> > Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> > Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> > Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> > Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> > Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> > Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> > Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> > Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> > Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
> > Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> >
> > I didn´t see anything BTRFS related in there and am not sure whether it is
> > to the BTRFS hang.
> >
> >
> > I think I will try this tomorrow, cause, hey, I want to update my backup!
> >
> > For safety I will run a scrub now.
> >
> > Ciao,
> > --
> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> > GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
> 
> 
> 
> 

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±ý»k~ÏâžØ^n‡r¡ö¦zË\x1aëh™¨è­Ú&£ûàz¿äz¹Þ—ú+€Ê+zf£¢·hšˆ§~†­†Ûiÿÿïêÿ‘êçz_è®\x0fæj:+v‰¨þ)ߣøm

Re: [BUG] Hang during backup with rsync

[Filipe David Manana]

On Fri, May 1, 2015 at 11:40 AM, Martin Steigerwald <martin@lichtvoll.de> wrote:
> Am Freitag, 1. Mai 2015, 11:30:10 schrieb Filipe David Manana:
>> On Thu, Apr 30, 2015 at 6:29 PM, Martin Steigerwald <martin@lichtvoll.de> wrote:
>> > Hi!
>> >
>> > With Linux 4.0 I had a hang while backuping /home with my still rsync
>> > based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
>> > with one big BTRFS via Expresscard eSATA controller from Delock.
>> >
>> > The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
>> > no effect. I waited for a minute at least. Maybe it would have reacted after
>> > a longer time, but I wanted my machine back. Disks where idle, if I remember
>> > correctly. After reboot both filesystems mount okay.
>> >
>> >
>> > Label: 'home'  uuid:
>> >         Total devices 2 FS bytes used 129.46GiB
>> >         devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
>> >         devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home
>> >
>> > Label: 'steigerwald'
>> >         Total devices 1 FS bytes used 1.18TiB
>> >         devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1
>> >
>> > merkaba:~> btrfs fi df /home
>> > Data, RAID1: total=142.00GiB, used=126.70GiB
>> > System, RAID1: total=32.00MiB, used=48.00KiB
>> > Metadata, RAID1: total=4.00GiB, used=2.76GiB
>> > GlobalReserve, single: total=512.00MiB, used=0.00B
>> >
>> > merkaba:~> btrfs fi df /mnt/steigerwald
>> > Data, single: total=1.34TiB, used=1.17TiB
>> > System, DUP: total=8.00MiB, used=168.00KiB
>> > System, single: total=4.00MiB, used=0.00B
>> > Metadata, DUP: total=25.00GiB, used=11.17GiB
>> > Metadata, single: total=8.00MiB, used=0.00B
>> > GlobalReserve, single: total=512.00MiB, used=0.00B
>> >
>> >
>> > I got this in kern.log:
>> >
>> > Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
>> > Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
>> > Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
>> > Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
>> > Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
>> > Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
>> > Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
>> > Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
>> > Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
>> > Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>> > Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
>> > Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
>> > Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
>> > Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
>> > Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
>> > Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>> > Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> > Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
>> > Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
>> > Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
>> > Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
>> > Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
>> > Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
>> > Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
>> > Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!
>>
>> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/fs/btrfs/extent_io.c?id=refs/tags/v4.0.1#n4551
>>
>> line 4551 -> BUG_ON(extent_buffer_under_io(eb));
>>
>> Fixed recently by https://patchwork.kernel.org/patch/6261421/
>>
>> And no, it's not a recent regression. Problem goes back to 2012, it's
>> just a very hard to hit race.
>
> Wonderful. Thanks, Filipe.
>
> So chances are when I run the backup again it will run through nicely?

Probably, if there aren't any other problems.

>
> Will this change be in 4.1-rc2? I don´t see it in git log from Linus tree so far.

Don't know, that's up to the maintainers.

>
> Otherwise I would apply it manually.
>
> Thanks,
> Martin
>
>> > Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP
>> > Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
>> > Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
>> > Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
>> > Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
>> > Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
>> > Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
>> > Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
>> > Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
>> > Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
>> > Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
>> > Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
>> > Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
>> > Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
>> > Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
>> > Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
>> > Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
>> > Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
>> > Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
>> > Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
>> > Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
>> > Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
>> > Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
>> > Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
>> > Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6
>> > Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
>> > Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
>> > Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
>> > Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
>> > Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0
>> > Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP
>> > Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
>> > Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
>> > Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
>> > Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
>> > Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
>> > Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
>> > Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
>> > Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
>> > Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
>> > Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
>> > Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
>> > Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
>> > Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
>> > Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
>> > Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
>> > Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
>> > Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
>> > Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
>> > Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
>> > Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
>> > Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
>> > Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
>> > Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
>> > Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
>> > Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
>> > Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
>> > Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
>> > Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
>> > Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
>> > Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
>> > Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
>> > Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
>> > Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
>> > Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
>> > Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
>> > Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7
>> > Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
>> > Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
>> > Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
>> > Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
>> > Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
>> > Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
>> > Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
>> > Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
>> > Apr 30 17:58:47 merkaba kernel: [145040.868238]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
>> > Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
>> > Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
>> > Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
>> > Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
>> > Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
>> > Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
>> > Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
>> > Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
>> > Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
>> > Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
>> > Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
>> > Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
>> > Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
>> > Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
>> > Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
>> > Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
>> > Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
>> > Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
>> > Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
>> > Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
>> > Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
>> > Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
>> > Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
>> > Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
>> > Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
>> > Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
>> > Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
>> > Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
>> > Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
>> > Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
>> > Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
>> > Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
>> > Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
>> > Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
>> > Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
>> > Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
>> > Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
>> > Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
>> > Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
>> > Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
>> > Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
>> > Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
>> > Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
>> > Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
>> > Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
>> > Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
>> > Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
>> > Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
>> > Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
>> > Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
>> > Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
>> > Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
>> > Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
>> > Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
>> > Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
>> > Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
>> > Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
>> > Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
>> > Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
>> > Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
>> > Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
>> > Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
>> > Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
>> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
>> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
>> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
>> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015
>> >
>> >
>> >
>> > I unplugged and replugged the controller + cable several times before,
>> > as I was not sure whether it was seated properly, and during this I got:
>> >
>> > Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
>> > Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
>> > Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
>> > Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
>> > Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
>> > Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
>> > Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
>> > Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
>> > Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
>> > Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
>> > Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
>> > Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
>> > Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
>> > Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
>> > Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
>> > Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
>> > Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
>> > Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
>> > Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
>> > Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
>> > Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
>> > Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
>> > Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
>> > Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
>> > Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
>> > Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
>> > Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
>> > Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
>> > Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
>> > Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
>> > Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
>> > Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
>> > Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
>> > Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
>> > Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
>> > Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
>> > Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
>> > Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
>> > Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
>> > Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
>> > Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
>> > Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
>> > Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
>> > Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
>> > Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
>> > Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
>> > Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
>> > Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
>> > Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
>> > Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
>> > Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
>> > Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
>> > Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
>> > Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
>> > Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
>> > Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
>> > Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
>> > Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
>> > Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
>> > Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
>> > Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
>> > Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
>> > Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
>> > Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
>> > Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
>> > Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
>> > Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
>> > Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
>> > Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
>> > Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
>> > Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
>> > Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
>> > Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
>> > Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
>> > Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
>> > Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
>> > Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
>> > Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
>> > Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
>> > Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
>> > Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
>> > Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
>> > Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
>> > Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
>> > Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
>> > Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
>> > Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
>> > Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
>> > Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
>> > Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
>> > Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
>> > Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
>> > Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
>> > Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
>> > Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
>> > Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
>> > Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
>> > Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
>> > Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
>> > Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
>> > Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
>> > Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
>> > Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
>> > Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
>> > Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
>> > Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
>> > Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
>> > Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
>> > Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
>> > Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
>> > Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
>> > Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
>> > Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
>> > Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
>> > Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
>> >
>> > I didn´t see anything BTRFS related in there and am not sure whether it is
>> > to the BTRFS hang.
>> >
>> >
>> > I think I will try this tomorrow, cause, hey, I want to update my backup!
>> >
>> > For safety I will run a scrub now.
>> >
>> > Ciao,
>> > --
>> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
>> > GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
>>
>>
>>
>>
>
> --
> Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7



-- 
Filipe David Manana,

"Reasonable men adapt themselves to the world.
 Unreasonable men adapt the world to themselves.
 That's why all progress depends on unreasonable men."

Re: [BUG] Hang during backup with rsync

[Martin Steigerwald]

Am Freitag, 1. Mai 2015, 11:43:26 schrieb Filipe David Manana:
> On Fri, May 1, 2015 at 11:40 AM, Martin Steigerwald <martin@lichtvoll.de> wrote:
> > Am Freitag, 1. Mai 2015, 11:30:10 schrieb Filipe David Manana:
> >> On Thu, Apr 30, 2015 at 6:29 PM, Martin Steigerwald <martin@lichtvoll.de> wrote:
> >> > Hi!
> >> >
> >> > With Linux 4.0 I had a hang while backuping /home with my still rsync
> >> > based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
> >> > with one big BTRFS via Expresscard eSATA controller from Delock.
> >> >
> >> > The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
> >> > no effect. I waited for a minute at least. Maybe it would have reacted after
> >> > a longer time, but I wanted my machine back. Disks where idle, if I remember
> >> > correctly. After reboot both filesystems mount okay.
> >> >
> >> >
> >> > Label: 'home'  uuid:
> >> >         Total devices 2 FS bytes used 129.46GiB
> >> >         devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
> >> >         devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home
> >> >
> >> > Label: 'steigerwald'
> >> >         Total devices 1 FS bytes used 1.18TiB
> >> >         devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1
> >> >
> >> > merkaba:~> btrfs fi df /home
> >> > Data, RAID1: total=142.00GiB, used=126.70GiB
> >> > System, RAID1: total=32.00MiB, used=48.00KiB
> >> > Metadata, RAID1: total=4.00GiB, used=2.76GiB
> >> > GlobalReserve, single: total=512.00MiB, used=0.00B
> >> >
> >> > merkaba:~> btrfs fi df /mnt/steigerwald
> >> > Data, single: total=1.34TiB, used=1.17TiB
> >> > System, DUP: total=8.00MiB, used=168.00KiB
> >> > System, single: total=4.00MiB, used=0.00B
> >> > Metadata, DUP: total=25.00GiB, used=11.17GiB
> >> > Metadata, single: total=8.00MiB, used=0.00B
> >> > GlobalReserve, single: total=512.00MiB, used=0.00B
> >> >
> >> >
> >> > I got this in kern.log:
> >> >
> >> > Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> >> > Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
> >> > Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
> >> > Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
> >> > Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
> >> > Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
> >> > Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
> >> > Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
> >> > Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
> >> > Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
> >> > Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
> >> > Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
> >> > Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
> >> > Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
> >> > Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
> >> > Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> >> > Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> >> > Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
> >> > Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
> >> > Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
> >> > Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
> >> > Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
> >> > Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
> >> > Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
> >> > Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!
> >>
> >> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/fs/btrfs/extent_io.c?id=refs/tags/v4.0.1#n4551
> >>
> >> line 4551 -> BUG_ON(extent_buffer_under_io(eb));
> >>
> >> Fixed recently by https://patchwork.kernel.org/patch/6261421/
> >>
> >> And no, it's not a recent regression. Problem goes back to 2012, it's
> >> just a very hard to hit race.
> >
> > Wonderful. Thanks, Filipe.
> >
> > So chances are when I run the backup again it will run through nicely?
> 
> Probably, if there aren't any other problems.
> 
> >
> > Will this change be in 4.1-rc2? I don´t see it in git log from Linus tree so far.
> 
> Don't know, that's up to the maintainers.

Heck, I compile a 4.1 between rc1 and rc2 right now, cause I want to ensure
I can update my backup :)

I will report back then.

Thanks,
Martin

> >
> > Otherwise I would apply it manually.
> >
> > Thanks,
> > Martin
> >
> >> > Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP
> >> > Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> >> > Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> >> > Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> >> > Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> >> > Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
> >> > Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
> >> > Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
> >> > Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
> >> > Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
> >> > Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
> >> > Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> >> > Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> > Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
> >> > Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
> >> > Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
> >> > Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
> >> > Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
> >> > Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
> >> > Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> >> > Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> >> > Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> >> > Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
> >> > Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> >> > Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> >> > Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6
> >> > Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
> >> > Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
> >> > Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
> >> > Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
> >> > Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0
> >> > Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP
> >> > Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> >> > Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> >> > Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> >> > Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> >> > Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
> >> > Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
> >> > Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
> >> > Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
> >> > Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
> >> > Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
> >> > Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> >> > Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> > Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
> >> > Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
> >> > Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
> >> > Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
> >> > Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
> >> > Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
> >> > Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> >> > Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
> >> > Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> >> > Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> >> > Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> >> > Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> >> > Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> >> > Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> >> > Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> >> > Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
> >> > Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> >> > Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> >> > Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7
> >> > Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
> >> > Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
> >> > Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
> >> > Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
> >> > Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
> >> > Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
> >> > Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868238]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> >> > Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
> >> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
> >> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
> >> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
> >> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015
> >> >
> >> >
> >> >
> >> > I unplugged and replugged the controller + cable several times before,
> >> > as I was not sure whether it was seated properly, and during this I got:
> >> >
> >> > Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> >> > Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> >> > Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> >> > Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> >> > Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
> >> > Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> >> > Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> >> > Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> >> > Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> >> > Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
> >> > Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> >> > Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
> >> > Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> >> > Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> >> > Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> >> > Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> >> > Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
> >> > Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> >> > Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> >> > Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> >> > Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> >> > Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
> >> > Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> >> > Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
> >> > Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> >> > Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> >> > Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> >> > Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> >> > Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
> >> > Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> >> > Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> >> > Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> >> > Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> >> > Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
> >> > Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> >> > Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> >> > Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
> >> > Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> >> > Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
> >> > Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> >> > Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> >> >
> >> > I didn´t see anything BTRFS related in there and am not sure whether it is
> >> > to the BTRFS hang.
> >> >
> >> >
> >> > I think I will try this tomorrow, cause, hey, I want to update my backup!
> >> >
> >> > For safety I will run a scrub now.
> >> >
> >> > Ciao,
> >> > --
> >> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> >> > GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
> >>
> >>
> >>
> >>
> >
> > --
> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> > GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
> 
> 
> 
> 

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±ý»k~ÏâžØ^n‡r¡ö¦zË\x1aëh™¨è­Ú&£ûàz¿äz¹Þ—ú+€Ê+zf£¢·hšˆ§~†­†Ûiÿÿïêÿ‘êçz_è®\x0fæj:+v‰¨þ)ߣøm

Re: [REGRESSION] Hang during backup with rsync

[Duncan]

Martin Steigerwald posted on Fri, 01 May 2015 12:13:55 +0200 as excerpted:

> Am Freitag, 1. Mai 2015, 01:48:23 schrieb Duncan:
>> Martin Steigerwald posted on Thu, 30 Apr 2015 19:29:57 +0200 as
> excerpted:
>> > The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1
>> > had no effect. I waited for a minute at least. Maybe it would have
>> > reacted after a longer time, but I wanted my machine back. Disks
>> > where idle, if I remember correctly. After reboot both filesystems
>> > mount okay.
>> 
>> This response is in regard to what to do at an apparent hang, and has
>> nothing directly to do with btrfs...
>> 
>> Two comments:
>> 
>> 1) Depending on your graphics hardware and driver config, a modern
>> "KMS" (kernel modesetting) setup is more likely to "soft" hang in X
>> mode and not switch back to text mode, even when the system is
>> otherwise not hung and a VT switch would have worked fine pre-KMS-era.
>> 
>> So no response at an attempted VT switch (your ctrl-alt-F1) doesn't
>> mean what it used to...
> 
> I never read this. Also it is not obvious to me why a hardware reset
> would be needed if the embedded Intel gfx is initialized properly
> already. I do not believe that it was the GPU that hang.

I did say nothing directly to do with btrfs...  My target here was thus 
broader than btrfs triggered hangs, and in my experience, speaking in 
general, graphics, or hung X, is indeed a reasonably frequent hang 
trigger.  When it happens, the system in general may be fine and 
responsive, only X and the display being hung, such that a VT switch 
doesn't change what's displayed and a graphics reset of some sort is 
necessary.

Tho for those with multiple networked machines and ssh or the like 
running, remote access can often be used to get into a (seemingly) 
crashed machine that's actually only (local) graphics frozen, as well.

(In that case, for magic-srq, it's possible to echo the appropriate 
letter into /proc/sysrq-trigger, since the actual sysrq key, and thus 
sequences using it, are local-only.  AFAIK this technique can also be 
used on exotic keyboard layouts too, since I /think/ it's hardware 
keycodes otherwise, with the letters based on the US layout, but 
generated by other letters where they don't correspond to the same US 
layout keys.)

> I assume a simpler explaination: that X.org process was in D state and
> thus not able to respond to the keypress anymore.

As I said, this was intended more as a generic guide...

>> 2) Along the same lines, there's the kernel's magic-sysrequest
>> (sysrq/srq) functionality.

> Thank you for your detailed explaination. I may just print your mail as
> a reference :)

Something I mentioned just above but forgot in the original reply...  I 
/think/ the sequences are based on hardware keycodes, and the letters may 
be different if the layout isn't US standard.  However, echoing the 
appropriate letter into /proc/sysrq-trigger should work, regardless, and 
unlike the literal srq sequences, that can be done remotely too. =:^)

> While I do think that these key combination can be helpful for further
> debugging I doubt they would have done anything for ensuring data
> integrity, cause… BTRFS was hung.

As I said, think generically.  This was intended for cases where it isn't 
the filesystem, or where you don't know what it is.

However, while it won't help save the data, knowing whether the kernel is 
actually still alive and able to at least respond to the B/reboot 
sequence, can provide at least some information you might not otherwise 
have.

Plus, if you're at the keyboard already, it's easier than actually 
hitting the reset switch, tho of course unlike the physical reset switch, 
if the kernel is clobbered the srq-b sequence won't work and you'll have 
to reset anyway.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

Re: [REGRESSION] Hang during backup with rsync

[Austin S Hemmelgarn]

[-- Attachment #1: Type: text/plain, Size: 7444 bytes --]

On 2015-04-30 21:48, Duncan wrote:
> Martin Steigerwald posted on Thu, 30 Apr 2015 19:29:57 +0200 as excerpted:
>
>> The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
>> no effect. I waited for a minute at least. Maybe it would have reacted
>> after a longer time, but I wanted my machine back. Disks where idle, if
>> I remember correctly. After reboot both filesystems mount okay.
>
> This response is in regard to what to do at an apparent hang, and has
> nothing directly to do with btrfs...
>
> Two comments:
>
> 1) Depending on your graphics hardware and driver config, a modern
> "KMS" (kernel modesetting) setup is more likely to "soft" hang in X mode
> and not switch back to text mode, even when the system is otherwise not
> hung and a VT switch would have worked fine pre-KMS-era.
>
> While I'm no kernel or graphics expert, the problem from here /seems/ to
> be that a modern KMS kernel generally uses high-res framebuffer mode at
> the CLI as well, and because the basic kernel handling is unified
> framebuffer and kernel-mode-switching for both X and CLI modes, switching
> from X to CLI doesn't involve switching to the entirely separate VGA mode
> driver and with it the forced hardware reset that it used to.  Without
> that driver switch and forced reset, even if the switch actually occurs
> successfully in terms of what you might type, what is actually displayed
> may remain frozen, such that if you only have a local session, you
> generally have to reboot anyway, but if you already have a CLI login
> going in the VT you tried to switch to or can login blind, sometimes you
> can at least manage a controlled reboot, by doing an init 6 or systemctl
> reboot or whatever, even if the display is frozen and shows nothing.  Of
> course it doesn't always work, but given the chance to avoid an unclean
> shutdown, try it and see.
>
> So no response at an attempted VT switch (your ctrl-alt-F1) doesn't mean
> what it used to...
>
Something else to try in this case is Ctrl-Alt-Backspace, (Most linux 
distros have that configured to outright kill X running on the current 
VT) followed by Ctrl-Alt-Delete, which defaults on all modern distros to 
be equivalent to running 'shutdown -r now' from a root shell.
Also, you may try Alt-SysRq-V, which is supposed to 'restore the 
framebuffer console' (except on ARM systems, where it is used to dump 
the contents of hardware tracing modules).
> 2) Along the same lines, there's the kernel's magic-sysrequest (sysrq/srq)
> functionality.  Assuming you have it enabled in your kernel, you can try
> a series of alt-sysrq-key sequences and very possibly use that to avoid
> an entirely uncontrolled shutdown, even when major functionality upto and
> including all of userspace is non-functional.
>
> There's enough explanations written and googlable on the subject that
> I'll avoid a full explanation here, but the main point I have to make is
> that in addition to often allowing a semi-controlled shutdown/reboot, by
> using the keys in the prescribed sequence and noting at which point (if
> any) you actually get a response, you get at least some indication of how
> badly your system was actually locked up.
So, this is great advice in theory, except that a large majority of 
distributions targeted at enterprise level usage (Fedora, Ubuntu, RHEL, 
SuSE, CentOS, etc) have this functionality disabled at runtime by 
default 'for security' (which is BS, because if an attacker has the kind 
of access required to use SysRq, then he has sufficient access to be 
able to bring the system to it's knees through other methods as well).
> What I'd try first, right after the VT switch didn't work, is alt-srq-k.
> Called the secure-term sequence as it can be used to help avoid suspected
> keyloggers of certain (but not all) types, this tells the kernel to force-
> kill anything running on your current VT and reset it.  This can be used
> to kill an unresponsive X, for instance, and normally you'll get
> automatically switched to a CLI login, either due to automatic switching
> back to a previous VT (in the case of X on its own VT), or to automatic
> respawning of the login after the kernel kills it along with whatever
> else you were doing if you were already at the CLI.
>
> This alt-srq-k sequence is thus a good first fallback if ctrl-alt-Fx
> appears to do nothing, since it apparently forces the VT reset that
> switching to a VGAmode CLI used to, that switching to a KMS mode CLI
> doesn't.
>
> If that doesn't work, it's time for the usual REISUB sequence,
>
> * alt-srq-r (unraw the input, take out of X mode)
>
> * alt-srq-e (tErminate, aka SIGTERM, all of userspace, allowing anything
> still alive to terminate gracefully if it can)
>
> * alt-srq-i (kIll, aka SIGKILL, all userspace, forcefully killing
> anything that ignored the SIGTERM but still allowing the kernel to do
> normal cleanup if it can)
>
> (Tho from my own experience, if the K and R sequences don't help, then
> the E and I sequences aren't likely to do much either, as they're
> probably locked up bad enough that nothing will be gained, but OTOH,
> nothing is lost by trying them, either.)
>
I've found that sometimes Alt-SysRq-J is needed at this point in the 
sequence to get things to correctly write data out (it resumes I/O to 
filesystems that have been frozen with the fsfreeze command or ioctl), 
and it has no negative impact if not needed, so it's generally a good 
idea to just use it anyway.
> * alt-srq-s (Sync, force an emergency sync to storage of anything still
> write-cached)
>
> alt-srq-s can be used at any time, without disrupting normal operation
> except for any I/O triggered by the forced sync.  I've come to use it
> regularly immediately before I do anything that I think /might/ trigger
> system instability, so everything's synced before I try it, just in
> case.  Think of this as a forced version of the sync command.
>
> * alt-srq-u (remoUnt read-only, forcing all still functional filesystems
> read-only)
>
> The S and U steps are critical to a semi-controlled shutdown, and where
> they work, can often mean the difference between a filesystem with no
> errors on reboot as the kernel saved and cleanly mounted read-only to the
> extent it could, and various filesystem corruptions, if these steps
> weren't done or if the kernel was badly enough corrupted it was afraid to
> write anything lest it make the problem worse.
>
> * alt-srq-b (reBoot, force a reboot without any further cleanup).
>

Secondarily, for the sake of completeness, you can also use Alt-SysRq-o 
in place of Alt-SysRq-b to (try) to get the system to power off instead 
of reboot.  Also, it's significant to note that the exact keys used vary 
depending on the keymap loaded in the kernel, on a Dvorak keyboard for 
example, the sequence is instead P.COGX (which IIRC is the same sequence 
of scancodes as on QWERTY keyboards).  Furthermore, if you were running 
under X, you may need to add the Ctrl key to the combination to get it 
properly acknowledged.

It's worth mentioning also that many laptop keyboards (and some other 
modern keyboards) need you to use Ctrl-Alt-PrintScreen (or even some 
other odd key combination, for example the Dell laptop that I'm typing 
this on needs Fn-Alt-Home) instead of Alt-SysRq



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Re: [REGRESSION] Hang during backup with rsync

[Duncan]

Austin S Hemmelgarn posted on Fri, 01 May 2015 08:25:22 -0400 as
excerpted:

> Also, you may try Alt-SysRq-V, which is supposed to 'restore the
> framebuffer console' (except on ARM systems, where it is used to dump
> the contents of hardware tracing modules).

Thanks.  That one's gotta be fairly new and is new to me, but it was 
needed... for all the reasons I touched on. =:^)

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

Re: [REGRESSION] Hang during backup with rsync

[Martin Steigerwald]

Am Freitag, 1. Mai 2015, 11:30:10 schrieb Filipe David Manana:
> On Thu, Apr 30, 2015 at 6:29 PM, Martin Steigerwald <martin@lichtvoll.de> wrote:
> > Hi!
> >
> > With Linux 4.0 I had a hang while backuping /home with my still rsync
> > based backup script. /home is BTRFS Dual SSD RAID 1, backup is 2 TiB disk
> > with one big BTRFS via Expresscard eSATA controller from Delock.
> >
> > The hang was: Mouse pointer in KDE not movable anymore, Ctrl-Alt-F1 had
> > no effect. I waited for a minute at least. Maybe it would have reacted after
> > a longer time, but I wanted my machine back. Disks where idle, if I remember
> > correctly. After reboot both filesystems mount okay.
> >
> >
> > Label: 'home'  uuid:
> >         Total devices 2 FS bytes used 129.46GiB
> >         devid    1 size 170.00GiB used 146.03GiB path /dev/mapper/msata-home
> >         devid    2 size 170.00GiB used 146.03GiB path /dev/mapper/sata-home
> >
> > Label: 'steigerwald'
> >         Total devices 1 FS bytes used 1.18TiB
> >         devid    1 size 1.82TiB used 1.39TiB path /dev/sdc1
> >
> > merkaba:~> btrfs fi df /home
> > Data, RAID1: total=142.00GiB, used=126.70GiB
> > System, RAID1: total=32.00MiB, used=48.00KiB
> > Metadata, RAID1: total=4.00GiB, used=2.76GiB
> > GlobalReserve, single: total=512.00MiB, used=0.00B
> >
> > merkaba:~> btrfs fi df /mnt/steigerwald
> > Data, single: total=1.34TiB, used=1.17TiB
> > System, DUP: total=8.00MiB, used=168.00KiB
> > System, single: total=4.00MiB, used=0.00B
> > Metadata, DUP: total=25.00GiB, used=11.17GiB
> > Metadata, single: total=8.00MiB, used=0.00B
> > GlobalReserve, single: total=512.00MiB, used=0.00B
> >
> >
> > I got this in kern.log:
> >
> > Apr 30 17:14:27 merkaba kernel: [142441.099236] ata11: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:29 merkaba kernel: [142443.118750] ata11: SATA link down (SStatus 0 SControl 0)
> > Apr 30 17:14:33 merkaba kernel: [142446.570437] ata11: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xe frozen
> > Apr 30 17:14:33 merkaba kernel: [142446.570443] ata11: irq_stat 0x00b40090, PHY RDY changed
> > Apr 30 17:14:33 merkaba kernel: [142446.570453] ata11: hard resetting link
> > Apr 30 17:14:43 merkaba kernel: [142456.579984] ata11: softreset failed (timeout)
> > Apr 30 17:14:43 merkaba kernel: [142456.579999] ata11: hard resetting link
> > Apr 30 17:14:45 merkaba kernel: [142458.745258] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
> > Apr 30 17:14:45 merkaba kernel: [142458.746785] ata11.00: ATA-8: Hitachi HDS5C3020ALA632, ML6OA580, max UDMA/133
> > Apr 30 17:14:45 merkaba kernel: [142458.746791] ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
> > Apr 30 17:14:45 merkaba kernel: [142458.748560] ata11.00: configured for UDMA/100
> > Apr 30 17:14:45 merkaba kernel: [142458.748590] ata11: EH complete
> > Apr 30 17:14:45 merkaba kernel: [142458.748829] scsi 11:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 A580 PQ: 0 ANSI: 5
> > Apr 30 17:14:45 merkaba kernel: [142458.750317] sd 11:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
> > Apr 30 17:14:45 merkaba kernel: [142458.750432] sd 11:0:0:0: [sdc] Write Protect is off
> > Apr 30 17:14:45 merkaba kernel: [142458.750447] sd 11:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> > Apr 30 17:14:45 merkaba kernel: [142458.750506] sd 11:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> > Apr 30 17:14:45 merkaba kernel: [142458.750596] sd 11:0:0:0: Attached scsi generic sg3 type 0
> > Apr 30 17:14:45 merkaba kernel: [142458.817366]  sdc: sdc1
> > Apr 30 17:14:45 merkaba kernel: [142458.818317] sd 11:0:0:0: [sdc] Attached SCSI disk
> > Apr 30 17:14:46 merkaba kernel: [142460.048718] BTRFS: device label steigerwald devid 1 transid 9964 /dev/sdc1
> > Apr 30 17:14:57 merkaba kernel: [142470.859313] BTRFS info (device sdc1): enabling auto defrag
> > Apr 30 17:14:57 merkaba kernel: [142470.859328] BTRFS info (device sdc1): disk space caching is enabled
> > Apr 30 17:57:46 merkaba kernel: [145039.790346] ------------[ cut here ]------------
> > Apr 30 17:57:46 merkaba kernel: [145039.796051] kernel BUG at fs/btrfs/extent_io.c:4551!
> 
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/fs/btrfs/extent_io.c?id=refs/tags/v4.0.1#n4551
> 
> line 4551 -> BUG_ON(extent_buffer_under_io(eb));
> 
> Fixed recently by https://patchwork.kernel.org/patch/6261421/
> 
> And no, it's not a recent regression. Problem goes back to 2012, it's
> just a very hard to hit race.

I redid the backup with 4.1 rc1 from yesterday plus your patch.

It worked.

No other issues so far, so

Reported-and-tested-by: Martin Steigerwald <martin@lichtvoll.de>

(if you want to take it so early, as you said its a hard to hit race)

Thanks,
Martin

> > Apr 30 17:57:46 merkaba kernel: [145039.802527] invalid opcode: 0000 [#1] PREEMPT SMP
> > Apr 30 17:57:46 merkaba kernel: [145039.808550] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:57:46 merkaba kernel: [145039.864382] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:57:46 merkaba kernel: [145039.871788] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:57:46 merkaba kernel: [145039.879273] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145039.887460] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> > Apr 30 17:57:46 merkaba kernel: [145039.895164] RIP: 0010:[<ffffffffc050986d>]  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145039.902849] RSP: 0018:ffff88011be93998  EFLAGS: 00010202
> > Apr 30 17:57:46 merkaba kernel: [145039.910531] RAX: 0000000000000001 RBX: ffff880380dea9d8 RCX: ffff8803d34e1d18
> > Apr 30 17:57:46 merkaba kernel: [145039.919232] RDX: 0000000000000000 RSI: ffff8803d34e1b60 RDI: ffff880380dea9d8
> > Apr 30 17:57:46 merkaba kernel: [145039.927049] RBP: ffff88011be939b8 R08: 0000000000000000 R09: 0000000000000036
> > Apr 30 17:57:46 merkaba kernel: [145039.935254] R10: 0000000000000018 R11: ffff88011be93970 R12: 0000000000000005
> > Apr 30 17:57:46 merkaba kernel: [145039.942956] R13: ffff880380dea9d8 R14: ffff8802b31a2800 R15: 0000000000000227
> > Apr 30 17:57:46 merkaba kernel: [145039.950884] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> > Apr 30 17:57:46 merkaba kernel: [145039.958780] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > Apr 30 17:57:46 merkaba kernel: [145039.966673] CR2: 00007f3bec0ed000 CR3: 0000000001a0b000 CR4: 00000000000406e0
> > Apr 30 17:57:46 merkaba kernel: [145039.974906] Stack:
> > Apr 30 17:57:46 merkaba kernel: [145039.982958]  ffff880380dea9d8 ffff88011b1ac000 ffff88011b1acd88 ffff8802b31a2800
> > Apr 30 17:57:46 merkaba kernel: [145039.991204]  ffff88011be939f8 ffffffffc05099bb 0000000000000003 ffff880380dea9f8
> > Apr 30 17:57:46 merkaba kernel: [145039.998900]  ffff88011be939f8 ffff880380dea9d8 ffff880380dea9d8 ffff880380deb3b0
> > Apr 30 17:57:46 merkaba kernel: [145040.007140] Call Trace:
> > Apr 30 17:57:46 merkaba kernel: [145040.015141]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.022895]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.030967]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.039149]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.047319]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.055483]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.063159]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.071046]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.078955]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.086360]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.093766]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.100945]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:57:46 merkaba kernel: [145040.108499]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.115728]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:57:46 merkaba kernel: [145040.122849]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:57:46 merkaba kernel: [145040.129947]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:57:46 merkaba kernel: [145040.137039]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:57:46 merkaba kernel: [145040.143867]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:57:46 merkaba kernel: [145040.150659]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:57:46 merkaba kernel: [145040.157258]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:57:46 merkaba kernel: [145040.163654]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:57:46 merkaba kernel: [145040.170036]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:57:46 merkaba kernel: [145040.176191] Code: 80 75 0b 48 8b 47 10 48 c1 e8 02 83 e0 01 5d c3 55 48 89 e5 41 56 41 55 49 89 fd 41 54 53 4c 8b 67 10 e8 c3 ff ff ff 85 c0 74 02 <0f> 0b 49 8b 75 08 49 8b 7d 00 e8 40 ae ff ff 48 85 c0 49 89 c6
> > Apr 30 17:57:46 merkaba kernel: [145040.188172] RIP  [<ffffffffc050986d>] btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:57:46 merkaba kernel: [145040.192620]  RSP <ffff88011be93998>
> > Apr 30 17:57:46 merkaba kernel: [145040.223617] ---[ end trace 37e2d6f90374a311 ]---
> > Apr 30 17:57:46 merkaba kernel: [145040.223752] BUG: unable to handle kernel paging request at ffffffffffffffd8
> > Apr 30 17:58:47 merkaba kernel: [145040.233898] IP: [<ffffffff81058161>] kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.243119] PGD 1a0c067 PUD 1a0e067 PMD 0
> > Apr 30 17:58:47 merkaba kernel: [145040.251934] Oops: 0000 [#2] PREEMPT SMP
> > Apr 30 17:58:47 merkaba kernel: [145040.259693] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:58:47 merkaba kernel: [145040.335818] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:58:47 merkaba kernel: [145040.344323] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:58:47 merkaba kernel: [145040.354449] task: ffff8802d6501890 ti: ffff88011be90000 task.ti: ffff88011be90000
> > Apr 30 17:58:47 merkaba kernel: [145040.364822] RIP: 0010:[<ffffffff81058161>]  [<ffffffff81058161>] kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.373127] RSP: 0018:ffff88011be93630  EFLAGS: 00010002
> > Apr 30 17:58:47 merkaba kernel: [145040.379901] RAX: 0000000000000000 RBX: ffff88041e292c80 RCX: 000000000000000f
> > Apr 30 17:58:47 merkaba kernel: [145040.386431] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8802d6501890
> > Apr 30 17:58:47 merkaba kernel: [145040.393815] RBP: ffff88011be93648 R08: ffff88041e292ce8 R09: ffffffff81bd7400
> > Apr 30 17:58:47 merkaba kernel: [145040.403602] R10: ffffffff81c49844 R11: 000000000000bf56 R12: 0000000000000001
> > Apr 30 17:58:47 merkaba kernel: [145040.412894] R13: ffff8802d6501e10 R14: 0000000000000001 R15: ffff88041e292c80
> > Apr 30 17:58:47 merkaba kernel: [145040.422987] FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
> > Apr 30 17:58:47 merkaba kernel: [145040.433054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > Apr 30 17:58:47 merkaba kernel: [145040.442755] CR2: 0000000000000028 CR3: 00000000c5e41000 CR4: 00000000000406e0
> > Apr 30 17:58:47 merkaba kernel: [145040.453039] Stack:
> > Apr 30 17:58:47 merkaba kernel: [145040.463202]  ffffffff81054504 ffff88041e292c80 0000000000012c80 ffff88011be93698
> > Apr 30 17:58:47 merkaba kernel: [145040.473543]  ffffffff814c2452 ffff88011be93688 ffff8802d6501890 ffff8803a45da5a0
> > Apr 30 17:58:47 merkaba kernel: [145040.483955]  ffff88011be93fd8 ffff8802d6502030 ffff88011be93270 ffff8802d6501cf0
> > Apr 30 17:58:47 merkaba kernel: [145040.494213] Call Trace:
> > Apr 30 17:58:47 merkaba kernel: [145040.504372]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> > Apr 30 17:58:47 merkaba kernel: [145040.514807]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> > Apr 30 17:58:47 merkaba kernel: [145040.525013]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145040.535351]  [<ffffffff81043474>] do_exit+0x920/0x966
> > Apr 30 17:58:47 merkaba kernel: [145040.545437]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.555437]  [<ffffffff81005cad>] die+0x55/0x5e
> > Apr 30 17:58:47 merkaba kernel: [145040.565562]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> > Apr 30 17:58:47 merkaba kernel: [145040.575500]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> > Apr 30 17:58:47 merkaba kernel: [145040.584971]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.593350]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.603484]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> > Apr 30 17:58:47 merkaba kernel: [145040.613596]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> > Apr 30 17:58:47 merkaba kernel: [145040.623956]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> > Apr 30 17:58:47 merkaba kernel: [145040.634365]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.644968]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.655198]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.665069]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.674839]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.684508]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.694094]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.703562]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.712966]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.722421]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.731626]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.740529]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.749132]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.757469]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:58:47 merkaba kernel: [145040.765548]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.773297]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:58:47 merkaba kernel: [145040.780701]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:58:47 merkaba kernel: [145040.787774]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.794697]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.801326]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:58:47 merkaba kernel: [145040.807770]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:58:47 merkaba kernel: [145040.814183]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145040.820544]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:58:47 merkaba kernel: [145040.826770]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145040.832971] Code: 48 8b 04 25 80 a9 00 00 48 8b 80 10 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 48 8b 87 10 05 00 00 55 48 89 e5 5d <48> 8b 40 d8 c3 55 ba 08 00 00 00 48 89 e5 48 83 ec 10 48 8b b7
> > Apr 30 17:58:47 merkaba kernel: [145040.847356] RIP  [<ffffffff81058161>] kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.854365]  RSP <ffff88011be93630>
> > Apr 30 17:58:47 merkaba kernel: [145040.861220] CR2: ffffffffffffffd8
> > Apr 30 17:58:47 merkaba kernel: [145040.867964] ---[ end trace 37e2d6f90374a312 ]---
> > Apr 30 17:58:47 merkaba kernel: [145040.867970] Fixing recursive fault but reboot is needed!
> > Apr 30 17:58:47 merkaba kernel: [145040.867978] BUG: scheduling while atomic: kworker/u8:14/6061/0x00000004
> > Apr 30 17:58:47 merkaba kernel: [145040.867981] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:58:47 merkaba kernel: [145040.868230] Preemption disabled at:[<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.868238]
> > Apr 30 17:58:47 merkaba kernel: [145040.868247] CPU: 1 PID: 6061 Comm: kworker/u8:14 Tainted: G      D W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:58:47 merkaba kernel: [145040.868252] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:58:47 merkaba kernel: [145040.868279]  0000000000012c80 ffff88011be932e8 ffffffff814c0a2a 0000000080000004
> > Apr 30 17:58:47 merkaba kernel: [145040.868289]  ffff88041e292c80 ffff88011be932f8 ffffffff8105cdd5 ffff88011be93348
> > Apr 30 17:58:47 merkaba kernel: [145040.868297]  ffffffff814c236c ffff88011be93368 ffff8802d6501890 0000000000000000
> > Apr 30 17:58:47 merkaba kernel: [145040.868306] Call Trace:
> > Apr 30 17:58:47 merkaba kernel: [145040.868317]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> > Apr 30 17:58:47 merkaba kernel: [145040.868326]  [<ffffffff8105cdd5>] __schedule_bug+0x96/0xa4
> > Apr 30 17:58:47 merkaba kernel: [145040.868335]  [<ffffffff814c236c>] __schedule+0x71/0x57e
> > Apr 30 17:58:47 merkaba kernel: [145040.868344]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145040.868354]  [<ffffffff81042c5b>] do_exit+0x107/0x966
> > Apr 30 17:58:47 merkaba kernel: [145040.868363]  [<ffffffff814bfbe5>] ? printk+0x41/0x43
> > Apr 30 17:58:47 merkaba kernel: [145040.868374]  [<ffffffff8107ebbd>] ? kmsg_dump+0xa7/0xae
> > Apr 30 17:58:47 merkaba kernel: [145040.868382]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.868390]  [<ffffffff810347f9>] no_context+0x2d0/0x32d
> > Apr 30 17:58:47 merkaba kernel: [145040.868401]  [<ffffffff8108519c>] ? __call_rcu_nocb_enqueue+0x48/0xfc
> > Apr 30 17:58:47 merkaba kernel: [145040.868410]  [<ffffffff810348ba>] __bad_area_nosemaphore+0x64/0x1b4
> > Apr 30 17:58:47 merkaba kernel: [145040.868417]  [<ffffffff81034a18>] bad_area_nosemaphore+0xe/0x10
> > Apr 30 17:58:47 merkaba kernel: [145040.868425]  [<ffffffff81034dfa>] __do_page_fault+0x22f/0x3ed
> > Apr 30 17:58:47 merkaba kernel: [145040.868433]  [<ffffffff814c62e7>] ? native_iret+0x7/0x7
> > Apr 30 17:58:47 merkaba kernel: [145040.868441]  [<ffffffff81034fdb>] do_page_fault+0x23/0x4f
> > Apr 30 17:58:47 merkaba kernel: [145040.868449]  [<ffffffff814c71d2>] page_fault+0x22/0x30
> > Apr 30 17:58:47 merkaba kernel: [145040.868458]  [<ffffffff81058161>] ? kthread_data+0xc/0x11
> > Apr 30 17:58:47 merkaba kernel: [145040.868467]  [<ffffffff81054504>] ? wq_worker_sleeping+0xf/0x88
> > Apr 30 17:58:47 merkaba kernel: [145040.868476]  [<ffffffff814c2452>] __schedule+0x157/0x57e
> > Apr 30 17:58:47 merkaba kernel: [145040.868484]  [<ffffffff814c28e8>] schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145040.868492]  [<ffffffff81043474>] do_exit+0x920/0x966
> > Apr 30 17:58:47 merkaba kernel: [145040.868500]  [<ffffffff810058ad>] oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145040.868507]  [<ffffffff81005cad>] die+0x55/0x5e
> > Apr 30 17:58:47 merkaba kernel: [145040.868514]  [<ffffffff81002afe>] do_trap+0x66/0x11f
> > Apr 30 17:58:47 merkaba kernel: [145040.868521]  [<ffffffff8100317e>] do_error_trap+0xc9/0xe6
> > Apr 30 17:58:47 merkaba kernel: [145040.868589]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868656]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868664]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> > Apr 30 17:58:47 merkaba kernel: [145040.868671]  [<ffffffff8100367c>] do_invalid_op+0x1b/0x1d
> > Apr 30 17:58:47 merkaba kernel: [145040.868678]  [<ffffffff814c6e98>] invalid_op+0x18/0x20
> > Apr 30 17:58:47 merkaba kernel: [145040.868741]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868797]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868852]  [<ffffffffc05099bb>] release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868906]  [<ffffffffc0509dae>] free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868948]  [<ffffffffc04cecff>] copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.868992]  [<ffffffffc04d21cd>] split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869036]  [<ffffffffc04d2aa1>] btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869081]  [<ffffffffc04d3e01>] btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869132]  [<ffffffffc04e57ac>] btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869207]  [<ffffffffc04f1075>] add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869262]  [<ffffffffc04f65a3>] btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869314]  [<ffffffffc04f68de>] finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869375]  [<ffffffffc05150fe>] normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869384]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:58:47 merkaba kernel: [145040.869443]  [<ffffffffc0515304>] btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145040.869452]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:58:47 merkaba kernel: [145040.869461]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:58:47 merkaba kernel: [145040.869470]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.869478]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145040.869485]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:58:47 merkaba kernel: [145040.869493]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:58:47 merkaba kernel: [145040.869501]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145040.869508]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:58:47 merkaba kernel: [145040.869515]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145101.334039] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 2, t=60434 jiffies, g=5499107, c=5499106, q=0)
> > Apr 30 17:58:47 merkaba kernel: [145101.334064] Task dump for CPU 1:
> > Apr 30 17:58:47 merkaba kernel: [145101.334071] kworker/u8:14   D ffff88011be93688     0  6061      0 0x00080000
> > Apr 30 17:58:47 merkaba kernel: [145101.334107]  ffff8802d6501890 ffff8803a45da5a0 ffff88011be93fd8 ffff8802d6502030
> > Apr 30 17:58:47 merkaba kernel: [145101.334120]  ffff88011be93270 ffff8802d6501cf0 ffff88011be938e8 ffff88011be936b8
> > Apr 30 17:58:47 merkaba kernel: [145101.334131]  ffffffff814c28e8 ffff8802d6502525 ffff8802d6501890 ffff88011be93748
> > Apr 30 17:58:47 merkaba kernel: [145101.334144] Call Trace:
> > Apr 30 17:58:47 merkaba kernel: [145101.334164]  [<ffffffff814c28e8>] ? schedule+0x6f/0x7e
> > Apr 30 17:58:47 merkaba kernel: [145101.334178]  [<ffffffff81043474>] ? do_exit+0x920/0x966
> > Apr 30 17:58:47 merkaba kernel: [145101.334191]  [<ffffffff810058ad>] ? oops_end+0xa0/0xa8
> > Apr 30 17:58:47 merkaba kernel: [145101.334200]  [<ffffffff81005cad>] ? die+0x55/0x5e
> > Apr 30 17:58:47 merkaba kernel: [145101.334209]  [<ffffffff81002afe>] ? do_trap+0x66/0x11f
> > Apr 30 17:58:47 merkaba kernel: [145101.334219]  [<ffffffff8100317e>] ? do_error_trap+0xc9/0xe6
> > Apr 30 17:58:47 merkaba kernel: [145101.334324]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334399]  [<ffffffffc052a8d2>] ? btrfs_add_delayed_tree_ref+0x8a/0x141 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334409]  [<ffffffff814c5069>] ? _raw_spin_unlock+0x11/0x23
> > Apr 30 17:58:47 merkaba kernel: [145101.334419]  [<ffffffff8100367c>] ? do_invalid_op+0x1b/0x1d
> > Apr 30 17:58:47 merkaba kernel: [145101.334430]  [<ffffffff814c6e98>] ? invalid_op+0x18/0x20
> > Apr 30 17:58:47 merkaba kernel: [145101.334495]  [<ffffffffc050986d>] ? btrfs_release_extent_buffer_page+0x1b/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334555]  [<ffffffffc0509869>] ? btrfs_release_extent_buffer_page+0x17/0xde [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334615]  [<ffffffffc05099bb>] ? release_extent_buffer+0x8b/0xbb [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334674]  [<ffffffffc0509dae>] ? free_extent_buffer+0x8b/0x8f [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334717]  [<ffffffffc04cecff>] ? copy_for_split+0x1b5/0x1cc [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334762]  [<ffffffffc04d21cd>] ? split_leaf+0x23c/0x576 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334807]  [<ffffffffc04d2aa1>] ? btrfs_search_slot+0x59a/0x72b [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334853]  [<ffffffffc04d3e01>] ? btrfs_insert_empty_items+0x58/0xa3 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334907]  [<ffffffffc04e57ac>] ? btrfs_csum_file_blocks+0x439/0x548 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.334967]  [<ffffffffc04f1075>] ? add_pending_csums.isra.36+0x49/0x66 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335025]  [<ffffffffc04f65a3>] ? btrfs_finish_ordered_io+0x2c5/0x419 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335081]  [<ffffffffc04f68de>] ? finish_ordered_fn+0x10/0x12 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335146]  [<ffffffffc05150fe>] ? normal_work_helper+0xd2/0x217 [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335159]  [<ffffffff8105344f>] ? pwq_activate_delayed_work+0x2c/0x3a
> > Apr 30 17:58:47 merkaba kernel: [145101.335222]  [<ffffffffc0515304>] ? btrfs_endio_write_helper+0xd/0xf [btrfs]
> > Apr 30 17:58:47 merkaba kernel: [145101.335234]  [<ffffffff81053e23>] ? process_one_work+0x15d/0x2ad
> > Apr 30 17:58:47 merkaba kernel: [145101.335245]  [<ffffffff810543ed>] ? worker_thread+0x1d1/0x27e
> > Apr 30 17:58:47 merkaba kernel: [145101.335256]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145101.335267]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:58:47 merkaba kernel: [145101.335277]  [<ffffffff81057edf>] ? kthread+0xb2/0xba
> > Apr 30 17:58:47 merkaba kernel: [145101.335287]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:58:47 merkaba kernel: [145101.335297]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145101.335308]  [<ffffffff814c5688>] ? ret_from_fork+0x58/0x90
> > Apr 30 17:58:47 merkaba kernel: [145101.335318]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:58:47 merkaba kernel: [145101.335327] rcu_preempt kthread starved for 57217 jiffies!
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuset
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpu
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Initializing cgroup subsys cpuacct
> > Apr 30 19:17:13 merkaba kernel: [    0.000000] Linux version 4.0.0-tp520-btrfs-trim+ (martin@merkaba) (gcc version 4.9.2 (Debian 4.9.2-10) ) #25 SMP PREEMPT Mon Apr 13 09:38:29 CEST 2015
> >
> >
> >
> > I unplugged and replugged the controller + cable several times before,
> > as I was not sure whether it was seated properly, and during this I got:
> >
> > Apr 30 17:14:08 merkaba kernel: [142421.959435] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:08 merkaba kernel: [142421.959490] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.959522] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.959542] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:08 merkaba kernel: [142421.959709] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:08 merkaba kernel: [142421.961793] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.961827] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:08 merkaba kernel: [142421.961856] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:08 merkaba kernel: [142421.962005] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> > Apr 30 17:14:08 merkaba kernel: [142421.963120] scsi host8: sata_sil24
> > Apr 30 17:14:08 merkaba kernel: [142421.963435] ata8: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:11 merkaba kernel: [142424.602681] ata8: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> > Apr 30 17:14:11 merkaba kernel: [142424.602722] ------------[ cut here ]------------
> > Apr 30 17:14:11 merkaba kernel: [142424.602774] WARNING: CPU: 3 PID: 5714 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> > Apr 30 17:14:11 merkaba kernel: [142424.602778] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:14:11 merkaba kernel: [142424.602928] CPU: 3 PID: 5714 Comm: kworker/u8:4 Tainted: G           O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:14:11 merkaba kernel: [142424.602932] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:14:11 merkaba kernel: [142424.602942] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> > Apr 30 17:14:11 merkaba kernel: [142424.602946]  0000000000000009 ffff8803b3763bb8 ffffffff814c0a2a 0000000080000000
> > Apr 30 17:14:11 merkaba kernel: [142424.602952]  0000000000000000 ffff8803b3763bf8 ffffffff81040ce5 ffff8803a1a1c9b0
> > Apr 30 17:14:11 merkaba kernel: [142424.602958]  ffffffffc03a416c ffff8803bc17c000 0000000000000282 0000000000000000
> > Apr 30 17:14:11 merkaba kernel: [142424.602964] Call Trace:
> > Apr 30 17:14:11 merkaba kernel: [142424.602974]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> > Apr 30 17:14:11 merkaba kernel: [142424.602983]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> > Apr 30 17:14:11 merkaba kernel: [142424.603002]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:11 merkaba kernel: [142424.603008]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> > Apr 30 17:14:11 merkaba kernel: [142424.603026]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:11 merkaba kernel: [142424.603033]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> > Apr 30 17:14:11 merkaba kernel: [142424.603055]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> > Apr 30 17:14:11 merkaba kernel: [142424.603062]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> > Apr 30 17:14:11 merkaba kernel: [142424.603072]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> > Apr 30 17:14:11 merkaba kernel: [142424.603076]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> > Apr 30 17:14:11 merkaba kernel: [142424.603084]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> > Apr 30 17:14:11 merkaba kernel: [142424.603089]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> > Apr 30 17:14:11 merkaba kernel: [142424.603096]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> > Apr 30 17:14:11 merkaba kernel: [142424.603102]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> > Apr 30 17:14:11 merkaba kernel: [142424.603108]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> > Apr 30 17:14:11 merkaba kernel: [142424.603114]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> > Apr 30 17:14:11 merkaba kernel: [142424.603121]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> > Apr 30 17:14:11 merkaba kernel: [142424.603127]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> > Apr 30 17:14:11 merkaba kernel: [142424.603133]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:14:11 merkaba kernel: [142424.603140]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:14:11 merkaba kernel: [142424.603145]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:14:11 merkaba kernel: [142424.603151]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:14:11 merkaba kernel: [142424.603156]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:14:11 merkaba kernel: [142424.603161]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:14:11 merkaba kernel: [142424.603167]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:11 merkaba kernel: [142424.603172]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:14:11 merkaba kernel: [142424.603177]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:11 merkaba kernel: [142424.603181] ---[ end trace 37e2d6f90374a30f ]---
> > Apr 30 17:14:11 merkaba kernel: [142425.227122] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:11 merkaba kernel: [142425.227188] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.227225] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.227250] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:11 merkaba kernel: [142425.227440] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:11 merkaba kernel: [142425.229796] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.229846] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:11 merkaba kernel: [142425.229886] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:11 merkaba kernel: [142425.230124] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> > Apr 30 17:14:11 merkaba kernel: [142425.233547] scsi host9: sata_sil24
> > Apr 30 17:14:11 merkaba kernel: [142425.234206] ata9: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:13 merkaba kernel: [142427.254202] ata9: SATA link down (SStatus 0 SControl 0)
> > Apr 30 17:14:25 merkaba kernel: [142438.509382] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:25 merkaba kernel: [142438.509440] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.509473] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.509494] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:25 merkaba kernel: [142438.509666] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:25 merkaba kernel: [142438.511949] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.511990] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:25 merkaba kernel: [142438.512021] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:25 merkaba kernel: [142438.512213] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> > Apr 30 17:14:25 merkaba kernel: [142438.514955] scsi host10: sata_sil24
> > Apr 30 17:14:25 merkaba kernel: [142438.515693] ata10: SATA max UDMA/100 host m128@0xf1c02000 port 0xf1c00000 irq 19
> > Apr 30 17:14:27 merkaba kernel: [142441.083405] ata10: SATA link down (SStatus FFFFFFFF SControl FFFFFFFF)
> > Apr 30 17:14:27 merkaba kernel: [142441.083557] ------------[ cut here ]------------
> > Apr 30 17:14:27 merkaba kernel: [142441.083617] WARNING: CPU: 2 PID: 5768 at drivers/ata/libata-core.c:6259 ata_host_detach+0x7e/0x13a [libata]()
> > Apr 30 17:14:27 merkaba kernel: [142441.083621] Modules linked in: usblp uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media uas usb_storage ctr ccm rfcomm btusb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables tun binfmt_misc cpufreq_userspace cpufreq_stats cpufreq_powersave bnep cpufreq_conservative bluetooth msr ext4 crc16 mbcache jbd2 snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_seq_device x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_hdmi psmouse iwldvm cryptd mac80211 snd_hda_codec_conexant serio_raw snd_hda_codec_generic pcspkr i2c_i801 snd_hda_intel snd_hda_controller iwlwifi snd_hda_codec tpm_tis snd_hwdep battery thinkpad_acpi tpm cfg80211 ac snd_pcm nvram snd_timer rfkill snd soundcore lpc_ich mfd_core shpchp processor evdev joydev sbs sbshc coretemp hdaps(O) tp_smapi(O) thinkpad_ec(O) loop firewire_sbp2 fuse ecryptfs autofs4 md_mod btrfs xor raid6_pq microcode dm_mirror dm_region_hash dm_log dm_mod sg sr_mod sd_mod cdrom hid_generic usbhid hid crc32c_intel firewire_ohci ahci sdhci_pci libahci sdhci firewire_core mmc_core sata_sil24 crc_itu_t libata scsi_mod ehci_pci ehci_hcd usbcore usb_common e1000e ptp pps_core thermal
> > Apr 30 17:14:27 merkaba kernel: [142441.083829] CPU: 2 PID: 5768 Comm: kworker/u8:6 Tainted: G        W  O    4.0.0-tp520-btrfs-trim+ #25
> > Apr 30 17:14:27 merkaba kernel: [142441.083833] Hardware name: LENOVO 42433WG/42433WG, BIOS 8AET63WW (1.43 ) 05/08/2013
> > Apr 30 17:14:27 merkaba kernel: [142441.083845] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> > Apr 30 17:14:27 merkaba kernel: [142441.083850]  0000000000000009 ffff8803b0383bb8 ffffffff814c0a2a 0000000080000000
> > Apr 30 17:14:27 merkaba kernel: [142441.083857]  0000000000000000 ffff8803b0383bf8 ffffffff81040ce5 ffff8803980c8000
> > Apr 30 17:14:27 merkaba kernel: [142441.083864]  ffffffffc03a416c ffff88020f344000 0000000000000282 0000000000000000
> > Apr 30 17:14:27 merkaba kernel: [142441.083872] Call Trace:
> > Apr 30 17:14:27 merkaba kernel: [142441.083884]  [<ffffffff814c0a2a>] dump_stack+0x4f/0x7b
> > Apr 30 17:14:27 merkaba kernel: [142441.083894]  [<ffffffff81040ce5>] warn_slowpath_common+0x9c/0xb6
> > Apr 30 17:14:27 merkaba kernel: [142441.083917]  [<ffffffffc03a416c>] ? ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:27 merkaba kernel: [142441.083924]  [<ffffffff81040d93>] warn_slowpath_null+0x15/0x17
> > Apr 30 17:14:27 merkaba kernel: [142441.083958]  [<ffffffffc03a416c>] ata_host_detach+0x7e/0x13a [libata]
> > Apr 30 17:14:27 merkaba kernel: [142441.083967]  [<ffffffff8138e66a>] ? __pm_runtime_resume+0x52/0x60
> > Apr 30 17:14:27 merkaba kernel: [142441.083997]  [<ffffffffc03a4238>] ata_pci_remove_one+0x10/0x12 [libata]
> > Apr 30 17:14:27 merkaba kernel: [142441.084006]  [<ffffffff8123f157>] pci_device_remove+0x41/0x8c
> > Apr 30 17:14:27 merkaba kernel: [142441.084028]  [<ffffffff813861e0>] __device_release_driver+0x84/0xdb
> > Apr 30 17:14:27 merkaba kernel: [142441.084033]  [<ffffffff81386255>] device_release_driver+0x1e/0x2b
> > Apr 30 17:14:27 merkaba kernel: [142441.084041]  [<ffffffff8123a456>] pci_stop_bus_device+0x45/0x88
> > Apr 30 17:14:27 merkaba kernel: [142441.084047]  [<ffffffff8123a5fb>] pci_stop_and_remove_bus_device+0xe/0x1a
> > Apr 30 17:14:27 merkaba kernel: [142441.084054]  [<ffffffff81251a0e>] disable_slot+0x3a/0x7b
> > Apr 30 17:14:27 merkaba kernel: [142441.084061]  [<ffffffff8125201d>] acpiphp_check_bridge+0xa4/0xaf
> > Apr 30 17:14:27 merkaba kernel: [142441.084069]  [<ffffffff8125231c>] acpiphp_hotplug_notify+0xa0/0xc7
> > Apr 30 17:14:27 merkaba kernel: [142441.084076]  [<ffffffff8125227c>] ? acpiphp_post_dock_fixup+0xa4/0xa4
> > Apr 30 17:14:27 merkaba kernel: [142441.084084]  [<ffffffff81271eac>] acpi_device_hotplug+0x3ab/0x3f3
> > Apr 30 17:14:27 merkaba kernel: [142441.084091]  [<ffffffff8126bdbb>] acpi_hotplug_work_fn+0x1a/0x26
> > Apr 30 17:14:27 merkaba kernel: [142441.084099]  [<ffffffff81053e23>] process_one_work+0x15d/0x2ad
> > Apr 30 17:14:27 merkaba kernel: [142441.084107]  [<ffffffff810543ed>] worker_thread+0x1d1/0x27e
> > Apr 30 17:14:27 merkaba kernel: [142441.084114]  [<ffffffff8105421c>] ? rescuer_thread+0x27f/0x27f
> > Apr 30 17:14:27 merkaba kernel: [142441.084120]  [<ffffffff81057edf>] kthread+0xb2/0xba
> > Apr 30 17:14:27 merkaba kernel: [142441.084137]  [<ffffffff81050000>] ? do_prlimit+0x35/0x1b6
> > Apr 30 17:14:27 merkaba kernel: [142441.084144]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:27 merkaba kernel: [142441.084151]  [<ffffffff814c5688>] ret_from_fork+0x58/0x90
> > Apr 30 17:14:27 merkaba kernel: [142441.084158]  [<ffffffff81057e2d>] ? __kthread_parkme+0x62/0x62
> > Apr 30 17:14:27 merkaba kernel: [142441.084163] ---[ end trace 37e2d6f90374a310 ]---
> > Apr 30 17:14:27 merkaba kernel: [142441.094843] pci 0000:05:00.0: [1095:3531] type 00 class 0x018000
> > Apr 30 17:14:27 merkaba kernel: [142441.094924] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0000007f 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.094971] pci 0000:05:00.0: reg 0x18: [mem 0x00000000-0x00001fff 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.095001] pci 0000:05:00.0: reg 0x20: [io  0x0000-0x007f]
> > Apr 30 17:14:27 merkaba kernel: [142441.095231] pci 0000:05:00.0: supports D1 D2
> > Apr 30 17:14:27 merkaba kernel: [142441.097378] pci 0000:05:00.0: BAR 2: assigned [mem 0xf1c00000-0xf1c01fff 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.097412] pci 0000:05:00.0: BAR 0: assigned [mem 0xf1c02000-0xf1c0207f 64bit]
> > Apr 30 17:14:27 merkaba kernel: [142441.097452] pci 0000:05:00.0: BAR 4: assigned [io  0x4000-0x407f]
> > Apr 30 17:14:27 merkaba kernel: [142441.097595] sata_sil24 0000:05:00.0: enabling device (0000 -> 0003)
> >
> > I didn´t see anything BTRFS related in there and am not sure whether it is
> > to the BTRFS hang.
> >
> >
> > I think I will try this tomorrow, cause, hey, I want to update my backup!
> >
> > For safety I will run a scrub now.
> >
> > Ciao,
> > --
> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> > GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
> 
> 
> 
> 

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±ý»k~ÏâžØ^n‡r¡ö¦zË\x1aëh™¨è­Ú&£ûàz¿äz¹Þ—ú+€Ê+zf£¢·hšˆ§~†­†Ûiÿÿïêÿ‘êçz_è®\x0fæj:+v‰¨þ)ߣøm