Hi,
it seems like I triggered a bug after deleting some (actually all)
subvolumes from a 2 TB backup volume (about 1.5 TB worth of data, around
20 subvolumes, btrfs-cleaner took quite a long time), and running a
"btrfs filesystem defrag ." within the volume afterwards, after cleaner
seemed to have finished. I rebooted (had to reset because the shutdown
process didn't finish) and tried the defrag again which immediately
triggered the same bug.
dmesg:
[38016.025970] ------------[ cut here ]------------
[38016.025976] kernel BUG at fs/btrfs/inode.c:3142!
[38016.025978] invalid opcode: 0000 [#1] PREEMPT SMP
[38016.025980] Modules linked in: ses enclosure uas usb_storage
nvidia_uvm(PO) fuse xt_addrtype xt_conntrack ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack iptable_filter ip_tables x_tables bridge
stp llc cfg80211 rfkill snd_hda_codec_hdmi ext4 crc16 mbcache jbd2
snd_hda_codec_realtek iTCO_wdt snd_hda_codec_generic iTCO_vendor_support
gpio_ich coretemp mousedev nvidia(PO) ppdev mxm_wmi evdev psmouse
kvm_intel serio_raw mac_hid kvm winbond_cir i2c_i801 lpc_ich rc_core
led_class tpm_tis drm tpm parport_pc acpi_cpufreq snd_hda_intel parport
wmi snd_hda_controller processor snd_hda_codec button snd_hwdep snd_pcm
e1000e snd_timer snd soundcore i7core_edac shpchp ptp pps_core edac_core
i5500_temp sch_fq_codel asc7621 hwmon i2c_core nfs lockd
[38016.026011] grace sunrpc fscache btrfs xor raid6_pq xts gf128mul
algif_skcipher af_alg dm_crypt dm_mod ata_generic pata_acpi hid_generic
usbhid hid sr_mod cdrom sd_mod pata_marvell atkbd libps2 crc32c_intel
ahci libahci firewire_ohci libata ehci_pci uhci_hcd firewire_core
crc_itu_t ehci_hcd scsi_mod usbcore usb_common i8042 serio
[38016.026029] CPU: 1 PID: 8534 Comm: btrfs-cleaner Tainted: P
IO 3.19.2-1-ARCH #1
[38016.026031] Hardware name: /DX58SO, BIOS
SOX5810J.86A.5599.2012.0529.2218 05/29/2012
[38016.026032] task: ffff8803206193e0 ti: ffff8800b49ec000 task.ti:
ffff8800b49ec000
[38016.026034] RIP: 0010:[<ffffffffa035dea0>] [<ffffffffa035dea0>]
btrfs_orphan_add+0x1c0/0x1e0 [btrfs]
[38016.026049] RSP: 0018:ffff8800b49efc38 EFLAGS: 00010286
[38016.026051] RAX: 00000000ffffffe4 RBX: ffff8800cb1b7000 RCX:
000000000000002d
[38016.026052] RDX: 0000000000010000 RSI: 0000000000010000 RDI:
ffff8801f057e138
[38016.026053] RBP: ffff8800b49efc78 R08: 000000000001b9d0 R09:
ffff88003251f3f0
[38016.026054] R10: ffff88032fc3c540 R11: ffffea0008d0c240 R12:
ffff88001ab1bad0
[38016.026055] R13: ffff8800cacbef20 R14: ffff8800cb1b7458 R15:
0000000000000001
[38016.026057] FS: 0000000000000000(0000) GS:ffff88032fc20000(0000)
knlGS:0000000000000000
[38016.026058] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[38016.026059] CR2: 00007fcb1f50d090 CR3: 0000000001811000 CR4:
00000000000007e0
[38016.026060] Stack:
[38016.026061] ffff8800b49efc78 ffffffffa039f355 ffff8801f057e000
ffff880313981800
[38016.026063] ffff88003251f3f0 ffff88001ab1bad0 ffff88031d5eda00
ffff880233fb7480
[38016.026065] ffff8800b49efd08 ffffffffa0346c99 ffff88003251f3f8
ffff88003251f470
[38016.026067] Call Trace:
[38016.026078] [<ffffffffa039f355>] ? lookup_free_space_inode+0x45/0xf0
[btrfs]
[38016.026087] [<ffffffffa0346c99>]
btrfs_remove_block_group+0x149/0x780 [btrfs]
[38016.026097] [<ffffffffa03823db>] btrfs_remove_chunk+0x6fb/0x7e0 [btrfs]
[38016.026105] [<ffffffffa0347519>] btrfs_delete_unused_bgs+0x249/0x270
[btrfs]
[38016.026114] [<ffffffffa034eae4>] cleaner_kthread+0x144/0x1a0 [btrfs]
[38016.026123] [<ffffffffa034e9a0>] ?
btrfs_destroy_pinned_extent+0xe0/0xe0 [btrfs]
[38016.026128] [<ffffffff81091748>] kthread+0xd8/0xf0
[38016.026130] [<ffffffff81091670>] ? kthread_create_on_node+0x1c0/0x1c0
[38016.026133] [<ffffffff81562758>] ret_from_fork+0x58/0x90
[38016.026135] [<ffffffff81091670>] ? kthread_create_on_node+0x1c0/0x1c0
[38016.026136] Code: 60 04 00 00 e9 b0 fe ff ff 66 90 89 45 c8 f0 41 80
64 24 80 fd 4c 89 e7 e8 2e 14 fe ff 8b 45 c8 e9 1b ff ff ff 66 0f 1f 44
00 00 <0f> 0b b8 f4 ff ff ff e9 10 ff ff ff 4c 89 f7 45 31 f6 e8 99 40
[38016.026156] RIP [<ffffffffa035dea0>] btrfs_orphan_add+0x1c0/0x1e0
[btrfs]
[38016.026164] RSP <ffff8800b49efc38>
[38016.026167] ---[ end trace d42bede17d45ec34 ]---
btrfs fi df:
Data, single: total=1.02TiB, used=437.50MiB
System, DUP: total=8.00MiB, used=128.00KiB
System, single: total=4.00MiB, used=0.00B
Metadata, DUP: total=7.00GiB, used=1.02MiB
Metadata, single: total=8.00MiB, used=0.00B
GlobalReserve, single: total=4.00MiB, used=3.87MiB
BTW, it's interesting that 437 MB of data are used since there are no
files left on the volume.
Please let me know how I can help you to debug this.
Best regards,
Sebastian
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