Kernel crash if both devices in raid1 are failing

[Dmitry Katsubo <dmitry.katsubo@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 3572 bytes --]

Dear btrfs community,

I have the following setup:

# btrfs fi show /home
Label: none  uuid: 865f8cf9-27be-41a0-85a4-6cb4d1658ce3
	Total devices 3 FS bytes used 55.68GiB
	devid    1 size 52.91GiB used 0.00B path /dev/sdd2
	devid    2 size 232.89GiB used 59.03GiB path /dev/sda
	devid    3 size 111.79GiB used 59.03GiB path /dev/sdc1

btrfs volume was created in raid1 mode both for data and metadata and mounted
with compress=lzo option.

Unfortunately, two drives (sda and sdc1) started to fail at the same time. This
leads to system crash if I start the system in runlevel 3 (see crash1.log).

After I have started the system in single mode, volume can be mounted in rw
mode and I can write some data into it. Unfortunately when I tried to read
a certain file, the system crashed (see crash2.log).

I have started scrub on the volume and here is the report:

# btrfs scrub status /home
scrub status for 865f8cf9-27be-41a0-85a4-6cb4d1658ce3
	scrub started at Tue Apr 12 20:39:20 2016 and finished after 02:40:09
	total bytes scrubbed: 55.68GiB with 1767 errors
	error details: verify=175 csum=1592
	corrected errors: 1110, uncorrectable errors: 657, unverified errors: 0

Obviously, some data is lost. However due to above crash, I cannot just copy
the data from the volume. I would assume that I still can access the data, but
the files for which data is lost, should result I/O error (I would then recover
them from my backup).

I have decided to attach another drive and remove failing devices one-by-one.
However that does not work:

# btrfs dev delete /dev/sda /home
[  168.680057] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  168.684236] ata3.00: BMDMA stat 0x25
[  168.688464] ata3.00: failed command: READ DMA
[  168.692681] ata3.00: cmd c8/00:08:68:4b:84/00:00:00:00:00/e7 tag 0 dma 4096 in
[  168.692681]          res 51/40:08:68:4b:84/40:08:07:00:00/e7 Emask 0x9 (media error)
[  168.701281] ata3.00: status: { DRDY ERR }
[  168.705600] ata3.00: error: { UNC }
[  168.724446] blk_update_request: I/O error, dev sda, sector 126110568
[  168.728860] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 43, flush 0, corrupt 0, gen 0
[  172.824043] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  172.828651] ata3.00: BMDMA stat 0x25
[  172.833281] ata3.00: failed command: READ DMA
[  172.837876] ata3.00: cmd c8/00:08:50:4b:84/00:00:00:00:00/e7 tag 0 dma 4096 in
[  172.837876]          res 51/40:08:50:4b:84/40:08:07:00:00/e7 Emask 0x9 (media error)
[  172.847296] ata3.00: status: { DRDY ERR }
[  172.852054] ata3.00: error: { UNC }
[  172.872404] blk_update_request: I/O error, dev sda, sector 126110544
[  172.877241] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 44, flush 0, corrupt 0, gen 0
ERROR: error removing device '/dev/sda': Input/output error

The same happens when I try to delete /dev/sdc1 from the volume. Is there any
btrfs "force" option so that btrfs balances only chunks that are accessible? I
can potentially physically disconnect /dev/sda, but the loss will be greater
I believe.

How can I proceed except btrfs restore?

During scrub operation the following was recorded in the logs:

[Tue Apr 12 23:10:20 2016] BTRFS warning (device sdc1): checksum error at logical 126952947712 on dev /dev/sdc1, sector 126150176, root 258, inode 879324, offset 308256768, length 4096, links 1 (path: lib/mysql/ibdata1)

If I collect all the messages like this, will it give a full picture of damaged files?

Many thanks in advance.

P.S. Linux kernel v4.4.2, btrfs-progs v4.4.

-- 
With best regards,
Dmitry

[-- Attachment #2: crash1.log --]
[-- Type: text/plain, Size: 13683 bytes --]

[  231.228068] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  231.231255] ata3.00: BMDMA stat 0x25
[  231.234443] ata3.00: failed command: READ DMA
[  231.237661] ata3.00: cmd c8/00:08:60:f9:99/00:00:00:00:00/e2 tag 0 dma 4096 in
[  231.237661]          res 51/40:08:60:f9:99/00:00:00:00:00/e2 Emask 0x9 (media error)
[  231.244022] ata3.00: status: { DRDY ERR }
[  231.247119] ata3.00: error: { UNC }
[  231.264447] blk_update_request: I/O error, dev sda, sector 43645280
[  231.267817] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 39, flush 0, corrupt 0, gen 0
[  232.127298] BTRFS error (device sdc1): parent transid verify failed on 65675001856 wanted 480578 found 480435
[  232.185418] BTRFS error (device sdc1): parent transid verify failed on 65679622144 wanted 480579 found 480435
[  232.359943] BTRFS error (device sdc1): parent transid verify failed on 65674952704 wanted 480578 found 480435
[  232.656145] BTRFS error (device sdc1): parent transid verify failed on 65674379264 wanted 480578 found 480435
[  232.851908] BTRFS error (device sdc1): parent transid verify failed on 65669464064 wanted 480579 found 480577
[  233.142476] BTRFS error (device sdc1): parent transid verify failed on 65674313728 wanted 480578 found 480435
[  233.497501] BTRFS error (device sdc1): parent transid verify failed on 65669513216 wanted 480579 found 480577
[  233.524154] BTRFS error (device sdc1): parent transid verify failed on 65683652608 wanted 480581 found 480435
[  237.764056] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  237.768802] ata3.00: BMDMA stat 0x25
[  237.773576] ata3.00: failed command: READ DMA
[  237.778314] ata3.00: cmd c8/00:20:20:e4:e5/00:00:00:00:00/e3 tag 0 dma 16384 in
[  237.778314]          res 51/40:20:20:e4:e5/00:00:00:00:00/e3 Emask 0x9 (media error)
[  237.787563] ata3.00: status: { DRDY ERR }
[  237.792179] ata3.00: error: { UNC }
[  237.864419] blk_update_request: I/O error, dev sda, sector 65397792
[  237.868875] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 40, flush 0, corrupt 0, gen 0
[  238.543890] BTRFS error (device sdc1): parent transid verify failed on 65673199616 wanted 480580 found 480435
[  238.801479] BTRFS error (device sdc1): parent transid verify failed on 65683308544 wanted 480581 found 480435
[  239.347274] BTRFS error (device sdc1): parent transid verify failed on 65674412032 wanted 480578 found 480435
[  239.372299] BTRFS error (device sdc1): parent transid verify failed on 65672527872 wanted 480580 found 480435
[  239.491870] BTRFS error (device sdc1): parent transid verify failed on 65668481024 wanted 480579 found 480577
[  239.582422] BTRFS error (device sdc1): parent transid verify failed on 65686175744 wanted 480581 found 480435
[  239.691309] BTRFS error (device sdc1): parent transid verify failed on 65681702912 wanted 480579 found 480435
[  240.017385] BTRFS error (device sdc1): parent transid verify failed on 65686634496 wanted 480581 found 480435
[  244.040086] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  244.044440] ata3.00: BMDMA stat 0x25
[  244.048966] ata3.00: failed command: READ DMA
[  244.053358] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  244.053358]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  244.062025] ata3.00: status: { DRDY ERR }
[  244.066476] ata3.00: error: { UNC }
[  244.084473] blk_update_request: I/O error, dev sda, sector 53114848
[  244.089016] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 41, flush 0, corrupt 0, gen 0
[  244.093894] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 42, flush 0, corrupt 0, gen 0
[  248.240054] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  248.244598] ata3.00: BMDMA stat 0x25
[  248.249081] ata3.00: failed command: READ DMA
[  248.253556] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  248.253556]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  248.262530] ata3.00: status: { DRDY ERR }
[  248.267010] ata3.00: error: { UNC }
[  248.284476] blk_update_request: I/O error, dev sda, sector 53114848
[  248.288964] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 43, flush 0, corrupt 0, gen 0
[  248.293527] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 44, flush 0, corrupt 0, gen 0
[  252.408055] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  252.412491] ata3.00: BMDMA stat 0x25
[  252.416923] ata3.00: failed command: READ DMA
[  252.421349] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  252.421349]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  252.430251] ata3.00: status: { DRDY ERR }
[  252.434649] ata3.00: error: { UNC }
[  252.452508] blk_update_request: I/O error, dev sda, sector 53114848
[  252.456940] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 45, flush 0, corrupt 0, gen 0
[  252.461408] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 46, flush 0, corrupt 0, gen 0
[  256.552055] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  256.556598] ata3.00: BMDMA stat 0x25
[  256.561200] ata3.00: failed command: READ DMA
[  256.565713] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  256.565713]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  256.574826] ata3.00: status: { DRDY ERR }
[  256.578304] ata3.00: error: { UNC }
[  256.604447] blk_update_request: I/O error, dev sda, sector 53114848
[  256.608960] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 47, flush 0, corrupt 0, gen 0
[  256.613615] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 48, flush 0, corrupt 0, gen 0
[  260.832091] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  260.836663] ata3.00: BMDMA stat 0x25
[  260.841190] ata3.00: failed command: READ DMA
[  260.845770] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  260.845770]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  260.855051] ata3.00: status: { DRDY ERR }
[  260.859741] ata3.00: error: { UNC }
[  260.880437] blk_update_request: I/O error, dev sda, sector 53114848
[  260.885169] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 49, flush 0, corrupt 0, gen 0
[  260.889647] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 50, flush 0, corrupt 0, gen 0
[  264.988058] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  264.992843] ata3.00: BMDMA stat 0x25
[  264.997661] ata3.00: failed command: READ DMA
[  265.002463] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  265.002463]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  265.012041] ata3.00: status: { DRDY ERR }
[  265.016832] ata3.00: error: { UNC }
[  265.044408] blk_update_request: I/O error, dev sda, sector 53114848
[  265.049112] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 51, flush 0, corrupt 0, gen 0
[  265.053514] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 52, flush 0, corrupt 0, gen 0
[  269.168059] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  269.172887] ata3.00: BMDMA stat 0x25
[  269.177253] ata3.00: failed command: READ DMA
[  269.180332] ata3.00: cmd c8/00:28:e0:77:2a/00:00:00:00:00/e3 tag 0 dma 20480 in
[  269.180332]          res 51/40:28:e0:77:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  269.186544] ata3.00: status: { DRDY ERR }
[  269.189696] ata3.00: error: { UNC }
[  269.208445] blk_update_request: I/O error, dev sda, sector 53114848
[  269.213356] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 53, flush 0, corrupt 0, gen 0
[  269.217903] BTRFS error (device sdc1): bdev /dev/sda errs: wr 0, rd 54, flush 0, corrupt 0, gen 0
[  269.221779] ------------[ cut here ]------------
[  269.225528] kernel BUG at /build/linux-z6Er2E/linux-4.4.2/fs/btrfs/extent_io.c:2401!
[  269.225647] invalid opcode: 0000 [#1] SMP 
[  269.225647] Modules linked in: netconsole configfs option usb_wwan usbserial bridge stp llc arc4 iTCO_wdt iTCO_vendor_support ppdev coretemp snd_hda_codec_realtek ath5k pcspkr snd_hda_codec_generic ath serio_raw mac80211 snd_hda_intel i2c_i801 snd_hda_codec snd_hda_core snd_hwdep snd_pcm_oss sr9700 cfg80211 snd_mixer_oss dm9601 snd_pcm evdev sg usbnet rfkill snd_timer lpc_ich mii snd mfd_core soundcore i915 rng_core acpi_cpufreq video drm_kms_helper drm 8250_fintek shpchp i2c_algo_bit parport_pc tpm_tis parport tpm button processor binfmt_misc w83627hf hwmon_vid autofs4 xfs libcrc32c ses enclosure crc32c_generic btrfs xor raid6_pq hid_generic uas usbhid hid usb_storage sr_mod cdrom sd_mod ata_generic ata_piix firewire_ohci e1000e libata ptp pps_core scsi_mod firewire_core crc_itu_t ehci_pci uhci_hcd ehci_hcd usbcore usb_common
[  269.225647] CPU: 0 PID: 1732 Comm: kworker/u4:8 Not tainted 4.4.0-1-686-pae #1 Debian 4.4.2-3
[  269.225647]  [<f869758b>] ? end_workqueue_fn+0x2b/0x40 [btrfs]
[  269.225647]  [<c1287080>] ? bio_endio+0x40/0x70
[  269.225647]  [<f86d9c7e>] ? btrfs_scrubparity_helper+0xce/0x270 [btrfs]
[  269.225647]  [<c107f9dd>] ? process_one_work+0x14d/0x360
[  269.225647]  [<c107fc29>] ? worker_thread+0x39/0x440
[  269.225647]  [<c107fbf0>] ? process_one_work+0x360/0x360
[  269.225647]  [<c1085026>] ? kthread+0xa6/0xc0
[  269.225647]  [<c153d949>] ? ret_from_kernel_thread+0x21/0x38
[  269.225647]  [<c1084f80>] ? kthread_create_on_node+0x130/0x130
[  269.225647] Code: 02 eb cf 8d 76 00 89 74 24 10 89 4c 24 0c 89 54 24 08 c7 44 24 04 e8 05 73 f8 c7 04 24 c0 05 74 f8 e8 88 b6 c1 c8 e9 46 ff ff ff <0f> 0b 90 55 89 e5 57 56 53 83 ec 08 3e 8d 74 26 00 89 ce 8b 0d
[  269.225647] EIP: [<f86c680d>] btrfs_check_repairable+0x12d/0x130 [btrfs] SS:ESP 0068:eab21e24
[  269.352509] ---[ end trace 4e1aa06ab00da653 ]---
[  269.357780] BUG: unable to handle kernel paging request at ffffffec
[  269.361219] IP: [<c10855bf>] kthread_data+0xf/0x20
[  269.361219] *pdpt = 0000000001817001 *pde = 00000000018a0067 *pte = 0000000000000000 
[  269.361219] Oops: 0000 [#2] SMP 
[  269.361219] Modules linked in: netconsole configfs option usb_wwan usbserial bridge stp llc arc4 iTCO_wdt iTCO_vendor_support ppdev coretemp snd_hda_codec_realtek ath5k pcspkr snd_hda_codec_generic ath serio_raw mac80211 snd_hda_intel i2c_i801 snd_hda_codec snd_hda_core snd_hwdep snd_pcm_oss sr9700 cfg80211 snd_mixer_oss dm9601 snd_pcm evdev sg usbnet rfkill snd_timer lpc_ich mii snd mfd_core soundcore i915 rng_core acpi_cpufreq video drm_kms_helper drm 8250_fintek shpchp i2c_algo_bit parport_pc tpm_tis parport tpm button processor binfmt_misc w83627hf hwmon_vid autofs4 xfs libcrc32c ses enclosure crc32c_generic btrfs xor raid6_pq hid_generic uas usbhid hid usb_storage sr_mod cdrom sd_mod ata_generic ata_piix firewire_ohci e1000e libata ptp pps_core scsi_mod firewire_core crc_itu_t ehci_pci uhci_hcd ehci_hcd usbcore usb_common
[  269.361219] CPU: 0 PID: 1732 Comm: kworker/u4:8 Tainted: G      D         4.4.0-1-686-pae #1 Debian 4.4.2-3
[  269.361219] Hardware name: AOpen i945GMx-IF/i945GMx-IF, BIOS i945GMx-IF R1.01 Mar.02.2007 AOpen Inc. 03/02/2007
[  269.361219] task: f255b800 ti: eab20000 task.ti: eab20000
[  269.361219] EIP: 0060:[<c10855bf>] EFLAGS: 00010002 CPU: 0
[  269.361219] EIP is at kthread_data+0xf/0x20
[  269.361219] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[  269.361219] ESI: 00000000 EDI: f255bacc EBP: eab21c80 ESP: eab21c78
[  269.361219]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  269.361219] CR0: 8005003b CR2: 00000014 CR3: 326fa540 CR4: 000006f0
[  269.361219] Stack:
[  269.361219]  c1080b40 c1810c40 f255b800 c1539cb9 f79d1740 f79d6d00 00000082 f79d1c40
[  269.361219]  f74e0d00 00000000 00000082 edb78580 edb7858c eab22000 eab21a9c f255b800
[  269.361219]  eab21cc4 c153a0ed eab21cfc eab21d14 c106c876 eab21de8 eab21cf0 c10ba6a7
[  269.361219] Call Trace:
[  269.361219]  [<c1080b40>] ? wq_worker_sleeping+0x10/0x90
[  269.361219]  [<c1539cb9>] ? __schedule+0x519/0x920
[  269.361219]  [<c153a0ed>] ? schedule+0x2d/0x80
[  269.361219]  [<c106c876>] ? do_exit+0x696/0x9e0
[  269.361219]  [<c10ba6a7>] ? vprintk_default+0x37/0x40
[  269.361219]  [<c1152fa1>] ? printk+0x17/0x19
[  269.361219]  [<c1015872>] ? oops_end+0x92/0xd0
[  269.361219]  [<c10132fa>] ? do_error_trap+0x8a/0x120
[  269.361219]  [<f86c680d>] ? btrfs_check_repairable+0x12d/0x130 [btrfs]
[  269.361219]  [<c1094f01>] ? sched_clock_cpu+0x81/0x130
[  269.361219]  [<c153b3d0>] ? mutex_lock+0x10/0x30
[  269.361219]  [<c10138c0>] ? do_overflow+0x30/0x30
[  269.361219]  [<c10138e4>] ? do_invalid_op+0x24/0x30
[  269.361219]  [<c153eac7>] ? error_code+0x67/0x6c
[  269.361219]  [<f86c680d>] ? btrfs_check_repairable+0x12d/0x130 [btrfs]
[  269.361219]  [<f86c6e1f>] ? end_bio_extent_readpage+0x53f/0x700 [btrfs]
[  269.361219]  [<f869758b>] ? end_workqueue_fn+0x2b/0x40 [btrfs]
[  269.361219]  [<c1287080>] ? bio_endio+0x40/0x70
[  269.361219]  [<f86d9c7e>] ? btrfs_scrubparity_helper+0xce/0x270 [btrfs]
[  269.361219]  [<c107f9dd>] ? process_one_work+0x14d/0x360
[  269.361219]  [<c107fc29>] ? worker_thread+0x39/0x440
[  269.361219]  [<c107fbf0>] ? process_one_work+0x360/0x360
[  269.361219]  [<c1085026>] ? kthread+0xa6/0xc0
[  269.361219]  [<c153d949>] ? ret_from_kernel_thread+0x21/0x38
[  269.361219]  [<c1084f80>] ? kthread_create_on_node+0x130/0x130
[  269.361219] Code: 00 b8 68 41 62 c1 e8 d1 45 fe ff e9 e7 fe ff ff 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 3e 8d 74 26 00 8b 80 9c 02 00 00 5d <8b> 40 ec c3 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 83
[  269.361219] EIP: [<c10855bf>] kthread_data+0xf/0x20 SS:ESP 0068:eab21c78

[-- Attachment #3: crash2.log --]
[-- Type: text/plain, Size: 12854 bytes --]

[  581.072053] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  581.076097] ata3.00: BMDMA stat 0x25
[  581.080138] ata3.00: failed command: READ DMA
[  581.084150] ata3.00: cmd c8/00:30:40:78:2a/00:00:00:00:00/e3 tag 0 dma 24576 in
[  581.084150]          res 51/40:30:40:78:2a/00:00:00:00:00/e3 Emask 0x9 (media error)
[  581.090802] ata3.00: status: { DRDY ERR }
[  581.093301] ata3.00: error: { UNC }
[  581.108551] blk_update_request: I/O error, dev sda, sector 53114944
[  581.112522] BTRFS error (device sde2): bdev /dev/sda errs: wr 0, rd 33, flush 0, corrupt 0, gen 0
[  581.116753] ------------[ cut here ]------------
[  581.120548] kernel BUG at /build/linux-z6Er2E/linux-4.4.2/fs/btrfs/volumes.c:5508!
[  581.120548] invalid opcode: 0000 [#1] SMP 
[  581.120548] Modules linked in: netconsole configfs bridge stp llc option usb_wwan usbserial arc4 iTCO_wdt iTCO_vendor_support ath5k ppdev ath mac80211 coretemp pcspkr cfg80211 serio_raw snd_hda_codec_realtek snd_hda_codec_generic rfkill sr9700 snd_hda_intel snd_hda_codec dm9601 usbnet snd_hda_core mii snd_hwdep snd_pcm_oss snd_mixer_oss sg snd_pcm evdev lpc_ich i915 snd_timer mfd_core snd soundcore i2c_i801 video rng_core acpi_cpufreq drm_kms_helper drm 8250_fintek shpchp parport_pc[  581.134587] ------------[ cut here ]------------
[  581.134596] WARNING: CPU: 0 PID: 6 at /build/linux-z6Er2E/linux-4.4.2/net/core/netpoll.c:367 netpoll_send_skb_on_dev+0x1b1/0x230()
[  581.134608] netpoll_send_skb_on_dev(): eth0 enabled interrupts in poll (e1000_xmit_frame+0x0/0xd90 [e1000e])
[  581.134608] Modules linked in: netconsole configfs bridge stp llc option usb_wwan usbserial arc4 iTCO_wdt iTCO_vendor_support ath5k ppdev ath mac80211 coretemp pcspkr cfg80211 serio_raw snd_hda_codec_realtek snd_hda_codec_generic rfkill sr9700 snd_hda_intel snd_hda_codec dm9601 usbnet snd_hda_core mii snd_hwdep snd_pcm_oss snd_mixer_oss sg snd_pcm evdev lpc_ich i915 snd_timer mfd_core snd soundcore i2c_i801 video rng_core acpi_cpufreq drm_kms_helper drm 8250_fintek shpchp parport_pc i2c_algo_bit parport tpm_tis tpm button processor binfmt_misc w83627hf hwmon_vid autofs4 xfs libcrc32c ses enclosure crc32c_generic btrfs xor raid6_pq hid_generic uas usbhid usb_storage hid sd_mod sr_mod cdrom ata_generic ata_piix libata scsi_mod firewire_ohci firewire_core crc_itu_t e1000e ptp pps_core ehci_pci uhci_hcd ehci_hcd usbcore usb_common
[  581.134711] CPU: 0 PID: 6 Comm: kworker/u4:0 Not tainted 4.4.0-1-686-pae #1 Debian 4.4.2-3
[  581.134713] Hardware name: AOpen i945GMx-IF/i945GMx-IF, BIOS i945GMx-IF R1.01 Mar.02.2007 AOpen Inc. 03/02/2007
[  581.134744] Workqueue: btrfs-endio btrfs_endio_helper [btrfs]
[  581.134747]  00000000 83955142 f750d8c0 c12b8fd5 f750d8d0 c1069a8d c1688318 f750d8f0
[  581.134755]  00000006 c16882e4 0000016f c14696e1 00000009 c14696e1 f387c000 0000004f
[  581.134765]  f38ecc00 f750d8dc c1069afe 00000009 f750d8d0 c1688318 f750d8f0 83955142
[  581.134772] Call Trace:
[  581.134780]  [<c12b8fd5>] ? dump_stack+0x3e/0x59
[  581.134785]  [<c1069a8d>] ? warn_slowpath_common+0x8d/0xc0
[  581.134788]  [<c14696e1>] ? netpoll_send_skb_on_dev+0x1b1/0x230
[  581.134791]  [<c14696e1>] ? netpoll_send_skb_on_dev+0x1b1/0x230
[  581.134794]  [<c1069afe>] ? warn_slowpath_fmt+0x3e/0x60
[  581.134797]  [<c14696e1>] ? netpoll_send_skb_on_dev+0x1b1/0x230
[  581.134805]  [<f83df5c0>] ? e1000e_update_tdt_wa.isra.53+0xb0/0xb0 [e1000e]
[  581.134814]  [<f8c7b1ce>] ? __br_deliver+0xfe/0x130 [bridge]
[  581.134822]  [<f8c7845c>] ? br_dev_xmit+0x1dc/0x230 [bridge]
[  581.134825]  [<c146916c>] ? netpoll_start_xmit+0x11c/0x1a0
[  581.134830]  [<c143b4d9>] ? __alloc_skb+0x69/0x1c0
[  581.134833]  [<c1469622>] ? netpoll_send_skb_on_dev+0xf2/0x230
[  581.134836]  [<c1469a11>] ? netpoll_send_udp+0x2b1/0x450
[  581.134840]  [<f8aa0b14>] ? write_msg+0xa4/0xe0 [netconsole]
[  581.134844]  [<f8aa0a70>] ? enabled_store+0x160/0x160 [netconsole]
[  581.134849]  [<c10b930b>] ? call_console_drivers.constprop.22+0xdb/0xe0
[  581.134853]  [<c10b9e9f>] ? console_unlock+0x52f/0x630
[  581.134856]  [<c10ba246>] ? vprintk_emit+0x2a6/0x580
[  581.134860]  [<c10ba6a7>] ? vprintk_default+0x37/0x40
[  581.134865]  [<c1152fa1>] ? printk+0x17/0x19
[  581.134872]  [<c10ea782>] ? print_modules+0x92/0xb0
[  581.134876]  [<c1015996>] ? __die+0x96/0x100
[  581.134878]  [<c1015d13>] ? die+0x33/0x60
[  581.134883]  [<c10132fa>] ? do_error_trap+0x8a/0x120
[  581.134906]  [<f86de706>] ? __btrfs_map_block+0x11a6/0x1580 [btrfs]
[  581.134930]  [<f86d57a4>] ? map_private_extent_buffer+0x54/0xd0 [btrfs]
[  581.134946]  [<f867fcde>] ? comp_keys+0x3e/0x60 [btrfs]
[  581.134963]  [<f867fd64>] ? generic_bin_search.constprop.36+0x64/0x170 [btrfs]
[  581.134967]  [<c10138c0>] ? do_overflow+0x30/0x30
[  581.134970]  [<c10138e4>] ? do_invalid_op+0x24/0x30
[  581.134974]  [<c153eac7>] ? error_code+0x67/0x6c
[  581.134979]  [<c153007b>] ? packet_sendmsg+0x53b/0x1150
[  581.135002]  [<f86de706>] ? __btrfs_map_block+0x11a6/0x1580 [btrfs]
[  581.135025]  [<f86c7e4b>] ? btrfs_get_token_32+0x10b/0x130 [btrfs]
[  581.135051]  [<f86df26e>] ? btrfs_map_bio+0x8e/0x370 [btrfs]
[  581.135075]  [<f86fe98a>] ? btrfs_submit_compressed_read+0x4ba/0x510 [btrfs]
[  581.135099]  [<f86ad323>] ? btrfs_submit_bio_hook+0x203/0x210 [btrfs]
[  581.135123]  [<f86d0edb>] ? end_bio_extent_readpage+0x5fb/0x700 [btrfs]
[  581.135144]  [<f86a158b>] ? end_workqueue_fn+0x2b/0x40 [btrfs]
[  581.135148]  [<c1287080>] ? bio_endio+0x40/0x70
[  581.135173]  [<f86e3c7e>] ? btrfs_scrubparity_helper+0xce/0x270 [btrfs]
[  581.135177]  [<c107f9dd>] ? process_one_work+0x14d/0x360
[  581.135180]  [<c107fc29>] ? worker_thread+0x39/0x440
[  581.135183]  [<c107fbf0>] ? process_one_work+0x360/0x360
[  581.135187]  [<c1085026>] ? kthread+0xa6/0xc0
[  581.135190]  [<c153d949>] ? ret_from_kernel_thread+0x21/0x38
[  581.135194]  [<c1084f80>] ? kthread_create_on_node+0x130/0x130
[  581.135196] ---[ end trace 3e2f94d2175a6a3e ]---

[  581.138407]  i2c_algo_bit parport tpm_tis tpm button processor binfmt_misc w83627hf hwmon_vid autofs4 xfs libcrc32c ses enclosure crc32c_generic btrfs xor raid6_pq hid_generic uas usbhid usb_storage hid sd_mod sr_mod cdrom ata_generic ata_piix libata scsi_mod firewire_ohci firewire_core crc_itu_t e1000e ptp pps_core ehci_pci uhci_hcd ehci_hcd usbcore usb_common
[  581.138407] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G        W       4.4.0-1-686-pae #1 Debian 4.4.2-3
[  581.138407] Hardware name: AOpen i945GMx-IF/i945GMx-IF, BIOS i945GMx-IF R1.01 Mar.02.2007 AOpen Inc. 03/02/2007
[  581.138407] Workqueue: btrfs-endio btrfs_endio_helper [btrfs]
[  581.138407] task: f74bf040 ti: f750c000 task.ti: f750c000
[  581.138407] EIP: 0060:[<f86de706>] EFLAGS: 00010217 CPU: 0
[  581.138407] EIP is at __btrfs_map_block+0x11a6/0x1580 [btrfs]
[  581.138407] EAX: 00001460 EBX: 00000002 ECX: 00000011 EDX: 00000000
[  581.138407] ESI: ffff0000 EDI: f3a3ffff EBP: f750dd34 ESP: f750dc60
[  581.138407]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  581.138407] CR0: 8005003b CR2: b6d54030 CR3: 37190a80 CR4: 000006f0
[  581.138407] Stack:
[  581.138407]  00010000 00000000 f86c7e4b f750dc84 f750dc88 00000000 00000000 000006ba
[  581.138407]  00008000 00000000 00000000 00000000 00000000 00000000 f6926920 00000018
[  581.138407]  00000000 f750dcf8 00004000 00010000 00000011 00000000 00000000 f750dd88
[  581.138407] Call Trace:
[  581.138407]  [<f86c7e4b>] ? btrfs_get_token_32+0x10b/0x130 [btrfs]
[  581.138407]  [<f86df26e>] ? btrfs_map_bio+0x8e/0x370 [btrfs]
[  581.138407]  [<f86fe98a>] ? btrfs_submit_compressed_read+0x4ba/0x510 [btrfs]
[  581.138407]  [<f86ad323>] ? btrfs_submit_bio_hook+0x203/0x210 [btrfs]
[  581.138407]  [<f86d0edb>] ? end_bio_extent_readpage+0x5fb/0x700 [btrfs]
[  581.138407]  [<f86a158b>] ? end_workqueue_fn+0x2b/0x40 [btrfs]
[  581.138407]  [<c1287080>] ? bio_endio+0x40/0x70
[  581.138407]  [<f86e3c7e>] ? btrfs_scrubparity_helper+0xce/0x270 [btrfs]
[  581.138407]  [<c107f9dd>] ? process_one_work+0x14d/0x360
[  581.522462]  [<c107fc29>] ? worker_thread+0x39/0x440
[  581.525520]  [<c107fbf0>] ? process_one_work+0x360/0x360
[  581.526271]  [<c1085026>] ? kthread+0xa6/0xc0
[  581.526271]  [<c153d949>] ? ret_from_kernel_thread+0x21/0x38
[  581.526271]  [<c1084f80>] ? kthread_create_on_node+0x130/0x130
[  581.526271] Code: 58 10 8b 5d 8c 89 48 0c 8b 93 7c 09 00 00 89 10 8b 55 c4 8b 46 38 89 3c 90 89 f8 bf 01 00 00 00 83 c0 01 89 45 a0 e9 4c f8 ff ff <0f> 0b c7 45 d4 01 00 00 00 e9 0c fa ff ff ba 69 16 00 00 b8 fc
[  581.526271] EIP: [<f86de706>] __btrfs_map_block+0x11a6/0x1580 [btrfs] SS:ESP 0068:f750dc60
[  581.545030] ---[ end trace 3e2f94d2175a6a3f ]---
[  581.548486] BUG: unable to handle kernel paging request at ffffffec
[  581.551854] IP: [<c10855bf>] kthread_data+0xf/0x20
[  581.552370] *pdpt = 0000000001817001 *pde = 00000000018a0067 *pte = 0000000000000000 
[  581.552370] Oops: 0000 [#2] SMP 
[  581.552370] Modules linked in: netconsole configfs bridge stp llc option usb_wwan usbserial arc4 iTCO_wdt iTCO_vendor_support ath5k ppdev ath mac80211 coretemp pcspkr cfg80211 serio_raw snd_hda_codec_realtek snd_hda_codec_generic rfkill sr9700 snd_hda_intel snd_hda_codec dm9601 usbnet snd_hda_core mii snd_hwdep snd_pcm_oss snd_mixer_oss sg snd_pcm evdev lpc_ich i915 snd_timer mfd_core snd soundcore i2c_i801 video rng_core acpi_cpufreq drm_kms_helper drm 8250_fintek shpchp parport_pc i2c_algo_bit parport tpm_tis tpm button processor binfmt_misc w83627hf hwmon_vid autofs4 xfs libcrc32c ses enclosure crc32c_generic btrfs xor raid6_pq hid_generic uas usbhid usb_storage hid sd_mod sr_mod cdrom ata_generic ata_piix libata scsi_mod firewire_ohci firewire_core crc_itu_t e1000e ptp pps_core ehci_pci uhci_hcd ehci_hcd usbcore usb_common
[  581.552370] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G      D W       4.4.0-1-686-pae #1 Debian 4.4.2-3
[  581.552370] Hardware name: AOpen i945GMx-IF/i945GMx-IF, BIOS i945GMx-IF R1.01 Mar.02.2007 AOpen Inc. 03/02/2007
[  581.552370] task: f74bf040 ti: f750c000 task.ti: f750c000
[  581.552370] EIP: 0060:[<c10855bf>] EFLAGS: 00010002 CPU: 0
[  581.552370] EIP is at kthread_data+0xf/0x20
[  581.552370] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[  581.552370] ESI: 00000000 EDI: f74bf30c EBP: f750dabc ESP: f750dab4
[  581.552370]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  581.552370] CR0: 8005003b CR2: 00000014 CR3: 37190a80 CR4: 000006f0
[  581.552370] Stack:
[  581.552370]  c1080b40 c1810c40 f74bf040 c1539cb9 f79d1740 f79d6d00 00000082 f79d1c40
[  581.552370]  f74e0d00 00000000 00000082 f3a8b180 f3a8b18c f750e000 f750d8d8 f74bf040
[  581.552370]  f750db00 c153a0ed f750db38 f750db50 c106c876 f750dc24 f750db2c c10ba6a7
[  581.552370] Call Trace:
[  581.552370]  [<c1080b40>] ? wq_worker_sleeping+0x10/0x90
[  581.552370]  [<c1539cb9>] ? __schedule+0x519/0x920
[  581.552370]  [<c153a0ed>] ? schedule+0x2d/0x80
[  581.552370]  [<c106c876>] ? do_exit+0x696/0x9e0
[  581.552370]  [<c10ba6a7>] ? vprintk_default+0x37/0x40
[  581.552370]  [<c1152fa1>] ? printk+0x17/0x19
[  581.552370]  [<c1015872>] ? oops_end+0x92/0xd0
[  581.552370]  [<c10132fa>] ? do_error_trap+0x8a/0x120
[  581.552370]  [<f86de706>] ? __btrfs_map_block+0x11a6/0x1580 [btrfs]
[  581.552370]  [<f86d57a4>] ? map_private_extent_buffer+0x54/0xd0 [btrfs]
[  581.552370]  [<f867fcde>] ? comp_keys+0x3e/0x60 [btrfs]
[  581.552370]  [<f867fd64>] ? generic_bin_search.constprop.36+0x64/0x170 [btrfs]
[  581.552370]  [<c10138c0>] ? do_overflow+0x30/0x30
[  581.552370]  [<c10138e4>] ? do_invalid_op+0x24/0x30
[  581.552370]  [<c153eac7>] ? error_code+0x67/0x6c
[  581.552370]  [<c153007b>] ? packet_sendmsg+0x53b/0x1150
[  581.552370]  [<f86de706>] ? __btrfs_map_block+0x11a6/0x1580 [btrfs]
[  581.552370]  [<f86c7e4b>] ? btrfs_get_token_32+0x10b/0x130 [btrfs]
[  581.552370]  [<f86df26e>] ? btrfs_map_bio+0x8e/0x370 [btrfs]
[  581.552370]  [<f86fe98a>] ? btrfs_submit_compressed_read+0x4ba/0x510 [btrfs]
[  581.552370]  [<f86ad323>] ? btrfs_submit_bio_hook+0x203/0x210 [btrfs]
[  581.552370]  [<f86d0edb>] ? end_bio_extent_readpage+0x5fb/0x700 [btrfs]
[  581.552370]  [<f86a158b>] ? end_workqueue_fn+0x2b/0x40 [btrfs]
[  581.552370]  [<c1287080>] ? bio_endio+0x40/0x70
[  581.552370]  [<f86e3c7e>] ? btrfs_scrubparity_helper+0xce/0x270 [btrfs]
[  581.552370]  [<c107f9dd>] ? process_one_work+0x14d/0x360
[  581.552370]  [<c107fc29>] ? worker_thread+0x39/0x440
[  581.552370]  [<c107fbf0>] ? process_one_work+0x360/0x360
[  581.552370]  [<c1085026>] ? kthread+0xa6/0xc0
[  581.552370]  [<c153d949>] ? ret_from_kernel_thread+0x21/0x38
[  581.552370]  [<c1084f80>] ? kthread_create_on_node+0x130/0x130
[  581.552370] Code: 00 b8 68 41 62 c1 e8 d1 45 fe ff e9 e7 fe ff ff 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 3e 8d 74 26 00 8b 80 9c 02 00 00 5d <8b> 40 ec c3 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89