Kernel 4.2 BUG at fs/btrfs/extent-tree.c:1833 while balancing

Kernel 4.2 BUG at fs/btrfs/extent-tree.c:1833 while balancing

[Malte Schröder]

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Hi,
I just switched to kernel 4.2. I had to replace one drive of a
btrfs-raid5 which was showing SMART errors. So I removed it (btrfs
device delete) while still on 4.1.6. In between kernel 4.2 was released
and I upgraded.
Now I added a replacement drive to the raid5-filesystem. When trying to
balance the fs it does fail with the BUG at the end of the mail.

I will revert to 4.1.6 and try this operation there.


#   uname -a
Linux gateway 4.2.0-gateway #1 SMP Tue Sep 1 15:36:23 CEST 2015 x86_64
GNU/Linux

#   btrfs --version
btrfs-progs v4.1.2

#   btrfs fi show
Label: 'SYSTEM'  uuid: e1c2694b-d33c-45f5-853d-db3ea5ea12cb
        Total devices 2 FS bytes used 211.71GiB
        devid    2 size 248.11GiB used 216.03GiB path /dev/sda2
        devid    3 size 248.11GiB used 216.03GiB path /dev/sdb2

Label: 'HOME'  uuid: 2a07c574-aee8-4744-af3c-43b9bc4ea18e
        Total devices 5 FS bytes used 5.16TiB
        devid    2 size 2.72TiB used 1.77TiB path /dev/sdd1
        devid    3 size 2.72TiB used 1.77TiB path /dev/sdc1
        devid    4 size 2.72TiB used 1.77TiB path /dev/sdg1
        devid    5 size 2.72TiB used 1.77TiB path /dev/sdf1
        devid    6 size 2.72TiB used 18.77GiB path /dev/sde1

btrfs-progs v4.1.2

#   btrfs fi df /home
Data, RAID5: total=5.31TiB, used=5.15TiB
System, RAID5: total=64.00MiB, used=404.00KiB
Metadata, RAID5: total=11.25GiB, used=9.39GiB
GlobalReserve, single: total=512.00MiB, used=0.00B


All I could capture from netconsole:

> [ 3082.493327] BTRFS info (device sdc1): enabling auto defrag
> [ 3082.493390] BTRFS info (device sdc1): disk space caching is enabled
> [ 3082.493469] BTRFS: has skinny extents
> [ 3085.676461] BTRFS: checking UUID tree
> [ 3094.106563] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
> [ 3094.106628] NFSD: starting 90-second grace period (net ffffffff8379de00)
> [ 3618.865269] BTRFS info (device sdc1): relocating block group 167574532784128 flags 4
> [ 3646.135691] BTRFS info (device sdc1): relocating block group 167574524395520 flags 4
> [ 3677.082739] BTRFS info (device sdc1): relocating block group 167574516006912 flags 4
> [ 3712.037417] BTRFS info (device sdc1): relocating block group 167574507618304 flags 4
> [ 3769.295701] BTRFS info (device sdc1): relocating block group 167574499229696 flags 4
> [ 3788.342267] BTRFS info (device sdc1): relocating block group 167574490841088 flags 4
> [ 3811.008060] BTRFS info (device sdc1): relocating block group 167574482452480 flags 4
> [ 3826.152032] BTRFS info (device sdc1): relocating block group 167574474063872 flags 4
> [ 3838.457233] BTRFS info (device sdc1): relocating block group 167574465675264 flags 4
> [ 3848.820929] BTRFS info (device sdc1): relocating block group 167574457286656 flags 4
> [ 3859.479263] BTRFS info (device sdc1): relocating block group 167570162319360 flags 129
> [ 3898.690126] BTRFS info (device sdc1): found 3280 extents
> [ 3909.669799] ------------[ cut here ]------------
> [ 3909.669839] kernel BUG at fs/btrfs/extent-tree.c:1833!
> [ 3909.669871] invalid opcode: 0000 [#1] SMP 
> [ 3909.669900] Modules linked in: cpuid netconsole configfs sit tunnel4 ip_tunnel rpcsec_gss_krb5 nls_iso8859_1 nls_cp437 nfsd auth_rpcgss nfs_acl lockd vfat fat grace sunrpc msr nf_log_ipv4 xt_REDIRECT nf_nat_redirect ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_log_ipv6 nf_log_common iptable_nat nf_nat_ipv4 ipt_REJECT nf_reject_ipv4 xt_recent ip6table_nat nf_nat_ipv6 xt_comment ip6t_REJECT nf_reject_ipv6 xt_addrtype xt_policy xt_mark ip6table_mangle ip6table_raw nf_conntrack_ipv6 nf_defrag_ipv6 iptable_mangle xt_tcpudp xt_CT iptable_raw xt_multiport nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp nf_nat_proto_gre nf_nat_irc nf_nat_h323 xt_NFLOG nf_nat_ftp xt_LOG nf_nat_amanda nf_nat nf_conntrack_tftp nf_conntrack_sane nf_conntrack_sip nf_conntrack_proto_udplite nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast ts_kmp nf_conntrack_irc n
f_conntrack_amanda nf_conntrack_h323 nf_conntrack_ftp nf_conntrack iptable_filter binfmt_misc ip_tables ip6table_filter cpufreq_stats ip6_tables x_tables tun nfnetlink_log nfnetlink 8021q garp mrp stp llc pl2303 ftdi_sio usbserial hid_generic usbhid hid x86_pkg_temp_thermal coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul crc32c_intel snd_hda_codec_hdmi ghash_clmulni_intel snd_hda_codec_realtek snd_hda_codec_generic aesni_intel iTCO_wdt iTCO_vendor_support snd_hda_intel i915 aes_x86_64 ehci_pci lrw snd_hda_codec xhci_pci xhci_hcd glue_helper ehci_hcd usbcore video snd_hwdep snd_hda_core ablk_helper cryptd evdev snd_pcsp snd_pcm input_leds usb_common led_class firewire_ohci firewire_core crc_itu_t sg snd_timer snd backlight soundcore lpc_ich drm_kms_helper drm tpm_tis intel_gtt tpm agpgart mfd_core 8250_pci mei_me mei i2c_i801 8250 serial_core button processor efivarfs microcode fan thermal [last unloaded: netconsole]
> [ 3909.689147] CPU: 3 PID: 4302 Comm: kworker/u16:8 Not tainted 4.2.0-gateway #1
> [ 3909.691307] Hardware name: Supermicro X10SAE/X10SAE, BIOS 2.0a 05/09/2014
> [ 3909.693492] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper
> [ 3909.695686] task: ffff88062d8b3ac0 ti: ffff8806044e0000 task.ti: ffff8806044e0000
> [ 3909.697915] RIP: 0010:[<ffffffff831e7e9e>]  [<ffffffff831e7e9e>] insert_inline_extent_backref+0xde/0xe0
> [ 3909.700194] RSP: 0018:ffff8806044e3b48  EFLAGS: 00010297
> [ 3909.702470] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000001
> [ 3909.704757] RDX: ffff880000000000 RSI: 0000000000000001 RDI: 0000000000000000
> [ 3909.707035] RBP: ffff88057d02d800 R08: 0000000000001000 R09: ffff8806044e3a58
> [ 3909.709309] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88051fed3e10
> [ 3909.711589] R13: 000000000000773b R14: 0000000000000000 R15: 0000000000000000
> [ 3909.713849] FS:  0000000000000000(0000) GS:ffff88081fac0000(0000) knlGS:0000000000000000
> [ 3909.716108] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 3909.718370] CR2: 00007f5c4c227000 CR3: 0000000003744000 CR4: 00000000001406e0
> [ 3909.720655] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 3909.722945] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 3909.725228] Stack:
> [ 3909.727495]  0000000000000000 000000000000773b 0000000000000002 0000000000000000
> [ 3909.729808]  ffff880500000001 ffffffff831dbb3e 0000000000000000 ffffffff831e8ebb
> [ 3909.732125]  0000000000000000 0000000000000e68 ffff88051fed3e10 ffff880662cdf000
> [ 3909.734450] Call Trace:
> [ 3909.736768]  [<ffffffff831dbb3e>] ? btrfs_free_path+0xe/0x20
> [ 3909.739097]  [<ffffffff831e8ebb>] ? __btrfs_free_extent.isra.77+0x31b/0xd50
> [ 3909.741424]  [<ffffffff831e7f42>] ? __btrfs_inc_extent_ref.isra.61+0xa2/0x280
> [ 3909.743761]  [<ffffffff831ecd53>] ? __btrfs_run_delayed_refs+0xb73/0xf80
> [ 3909.746101]  [<ffffffff83111cab>] ? __slab_free+0x11b/0x260
> [ 3909.748443]  [<ffffffff8312136d>] ? __sb_start_write+0x3d/0xd0
> [ 3909.750789]  [<ffffffff831efbac>] ? btrfs_run_delayed_refs.part.82+0x6c/0x270
> [ 3909.753150]  [<ffffffff831efe33>] ? delayed_ref_async_start+0x73/0x90
> [ 3909.755504]  [<ffffffff8305c7b7>] ? process_one_work+0x127/0x3f0
> [ 3909.757857]  [<ffffffff8305cac2>] ? worker_thread+0x42/0x480
> [ 3909.760199]  [<ffffffff8305ca80>] ? process_one_work+0x3f0/0x3f0
> [ 3909.762555]  [<ffffffff8306192c>] ? kthread+0xbc/0xe0
> [ 3909.764896]  [<ffffffff83061870>] ? kthread_worker_fn+0x140/0x140
> [ 3909.767230]  [<ffffffff83559f4f>] ? ret_from_fork+0x3f/0x70
> [ 3909.769564]  [<ffffffff83061870>] ? kthread_worker_fn+0x140/0x140
> [ 3909.771897] Code: e8 48 8b 84 24 b0 00 00 00 4c 89 f9 4c 89 e6 48 89 ef 48 89 44 24 10 8b 84 24 a8 00 00 00 89 44 24 08 e8 c6 d7 ff ff 31 c0 eb b3 <0f> 0b 41 57 41 56 4d 89 ce 41 55 4d 89 c5 41 54 55 48 89 fd 53 
> [ 3909.776864] RIP  [<ffffffff831e7e9e>] insert_inline_extent_backref+0xde/0xe0
> [ 3909.779312]  RSP <ffff8806044e3b48>
> [ 3909.796024] ---[ end trace 91ea038bf7079205 ]---
> [ 3909.926250] Kernel panic - not syncing: Fatal exception
> [ 3909.932780] Kernel Offset: 0x2000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> [ 3909.936691] drm_kms_helper: panic occurred, switching back to text console
> [ 3910.044595] Rebooting in 60 seconds..
> [ 3969.574795] ACPI MEMORY or I/O RESET_REG.
> 


/Malte


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