At 03/10/2017 08:23 PM, Hugo Mills wrote:
Does anyone recall seeing this oops before? Is it something that
can be fixed with a newer kernel? (I'm on a USB stick for this, so a
new kernel is a major undertaking, and I'd like some reasonable
expectation of success if I do it).
Yes, v4.10 has the fix for the bug.
Background: I'm rebuilding a dead server. I needed to reduce the
device count on this FS to 6. Stupidly, I attached one device using an
external USB case, and the USB connection reset during the device
delete (within a few seconds). I can mount the FS -o ro,recovery, but
using -o recovery on its own causes the oops below. If I can recover
in-place, that would save me a *lot* of time in restoring backups.
Also... qgroups, WTH? I've *never* enabled qgroups on this FS.
Did you use any auto-backup system?
Quite a lot of them will enable qgroup.
Anyway, after mounting with v4.10 kernel, you can easily find out if
qgroup is enabled.
Thanks,
Qu
For what it's worth, the FS passes btrfs check --readonly with no
errors reported. (btrfs --version is 4.7.3).
Hugo.
[ 566.852589] BTRFS warning (device sdh1): 'recovery' is deprecated, use
'usebackuproot' instead
[ 566.852591] BTRFS info (device sdh1): trying to use backup root at mount time
[ 566.852592] BTRFS info (device sdh1): disk space caching is enabled
[ 566.922803] BTRFS info (device sdh1): bdev /dev/sdh1 errs: wr 0, rd 20,
flush 0, corrupt 0, gen 0
[ 578.715616] BUG: unable to handle kernel paging request at fffffffffffffe50
[ 578.715619] IP: [<ffffffffc0a7714b>]
qgroup_fix_relocated_data_extents+0x2b/0x2c0 [btrfs]
[ 578.715638] PGD 2f400f067 PUD 2f4011067 PMD 0
[ 578.715640] Oops: 0000 [#1]
[ 578.715642] Modules linked in: cpufreq_userspace(E) cpufreq_powersave(E)
cpufreq_conservative(E) kvm_amd(E) kvm(E) irqbypass(E) crc32_pclmul(E)
efi_pstore(E) ghash_clmulni_intel(E) pcspkr(E) serio_raw(E) efivars(E)
fam15h_power(E) k10temp(E) btrfs(E) acpi_cpufreq(E) tpm_tis(E) tpm_tis_core(E)
tpm(E) sp5100_tco(E) sg(E) snd_hda_codec_realtek(E) snd_hda_codec_hdmi(E)
snd_hda_codec_generic(E) snd_hda_intel(E) 9p(E) snd_hda_codec(E) 9pnet(E)
snd_hda_core(E) fscache(E) snd_hwdep(E) snd_pcm(E) snd_timer(E) snd(E)
soundcore(E) shpchp(E) ib_iser(E) rdma_cm(E) iw_cm(E) ib_cm(E) ib_core(E)
configfs(E) iscsi_tcp(E) libiscsi_tcp(E) libiscsi(E) scsi_transport_iscsi(E)
fuse(E) evdev(E) aoe(E) efivarfs(E) ip_tables(E) x_tables(E) autofs4(E) loop(E)
overlay(E) nls_utf8(E) isofs(E) raid10(E) raid456(E) async_raid6_recov(E)
[ 578.715663] async_memcpy(E) async_pq(E) async_xor(E) async_tx(E) xor(E)
raid6_pq(E) libcrc32c(E) crc32c_generic(E) raid0(E) multipath(E) linear(E)
dm_mirror(E) dm_region_hash(E) dm_log(E) dm_mod(E) raid1(E) md_mod(E) sd_mod(E)
hid_generic(E) usbhid(E) hid(E) uas(E) usb_storage(E) crc32c_intel(E)
aesni_intel(E) aes_x86_64(E) glue_helper(E) lrw(E) gf128mul(E) ablk_helper(E)
cryptd(E) ohci_pci(E) ahci(E) libahci(E) sata_sil24(E) i2c_piix4(E) r8169(E)
mii(E) ehci_pci(E) ohci_hcd(E) ehci_hcd(E) libata(E) scsi_mod(E) radeon(E)
i2c_algo_bit(E) drm_kms_helper(E) xhci_pci(E) xhci_hcd(E) usbcore(E)
usb_common(E) ttm(E) drm(E) button(E)
[ 578.715684] CPU: 0 PID: 3532 Comm: mount Tainted: G E
4.8.0-1-grml-amd64 #1 Debian 4.8.15-1+grml.1
[ 578.715684] Hardware name: Gigabyte Technology Co., Ltd. To be filled by
O.E.M./970A-DS3P, BIOS FD 02/26/2016
[ 578.715686] task: ffff8fd7ead82fc0 task.stack: ffff8fd7db15c000
[ 578.715687] RIP: 0010:[<ffffffffc0a7714b>] [<ffffffffc0a7714b>]
qgroup_fix_relocated_data_extents+0x2b/0x2c0 [btrfs]
[ 578.715699] RSP: 0018:ffff8fd7db15fa08 EFLAGS: 00010246
[ 578.715700] RAX: ffff8fd7db133800 RBX: ffff8fd7e30c79a0 RCX: 0000000000000000
[ 578.715701] RDX: ffff8fd7ddb5cd10 RSI: ffff8fd7dc6b5000 RDI: ffff8fd7ddb5cc80
[ 578.715701] RBP: ffff8fd7e7445000 R08: 0000000000000000 R09: ffff8fd7ddb5cc80
[ 578.715702] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8fd7db15faa0
[ 578.715703] R13: ffff8fd7dc6b5000 R14: 0000000000000000 R15: ffff8fd7ddb5cc80
[ 578.715704] FS: 00007f23cd67f480(0000) GS:ffffffffbca35000(0000)
knlGS:0000000000000000
[ 578.715705] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 578.715706] CR2: fffffffffffffe50 CR3: 000000042302f000 CR4: 00000000000406b0
[ 578.715707] Stack:
[ 578.715707] 0000000000000000 0000000000000801 ffff8fd7ddb5cc80
0000000000000801
[ 578.715710] ffff8fd7ddb5cc80 ffffffffc0a24c44 0000000000000000
0000000000000000
[ 578.715711] ffff8f00db15fa40 0000000036d3c76a ffff8fd7e30c79a0
ffff8fd7e7445000
[ 578.715713] Call Trace:
[ 578.715726] [<ffffffffc0a24c44>] ? start_transaction+0x94/0x4c0 [btrfs]
[ 578.715738] [<ffffffffc0a7ab68>] ? btrfs_recover_relocation+0x2e8/0x420
[btrfs]
[ 578.715750] [<ffffffffc0a21a48>] ? open_ctree+0x2158/0x2680 [btrfs]
[ 578.715752] [<ffffffffbc2d5249>] ? snprintf+0x49/0x60
[ 578.715762] [<ffffffffc09f6d06>] ? btrfs_mount+0xd26/0xe70 [btrfs]
[ 578.715765] [<ffffffffbc1b5e52>] ? lookup_fast+0x52/0x300
[ 578.715767] [<ffffffffbc1af1a6>] ? mount_fs+0x36/0x170
[ 578.715770] [<ffffffffbc15ac85>] ? kstrdup+0x45/0x50
[ 578.715772] [<ffffffffbc1c925f>] ? vfs_kern_mount+0x5f/0x100
[ 578.715781] [<ffffffffc09f619c>] ? btrfs_mount+0x1bc/0xe70 [btrfs]
[ 578.715784] [<ffffffffbc2cb1b4>] ? ida_get_new_above+0x1e4/0x210
[ 578.715786] [<ffffffffbc1af1a6>] ? mount_fs+0x36/0x170
[ 578.715788] [<ffffffffbc15ac85>] ? kstrdup+0x45/0x50
[ 578.715790] [<ffffffffbc1c925f>] ? vfs_kern_mount+0x5f/0x100
[ 578.715791] [<ffffffffbc1c8b1c>] ? __get_fs_type+0x1c/0x30
[ 578.715793] [<ffffffffbc1cc1ac>] ? do_mount+0x1dc/0xbb0
[ 578.715794] [<ffffffffbc1cce64>] ? SyS_mount+0x84/0xc0
[ 578.715797] [<ffffffffbc577caf>] ? entry_SYSCALL_64_fastpath+0x1a/0xa4
[ 578.715798] Code: 0f 1f 44 00 00 41 57 41 56 41 55 41 54 55 53 48 83 ec 50 4c 8b
76 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 48 31 c0 48 8b 46 08 <49> 8b ae 50
fe ff ff 48 8b 98 f0 01 00 00 31 c0 f6 83 78 0a 00
[ 578.715816] RIP [<ffffffffc0a7714b>]
qgroup_fix_relocated_data_extents+0x2b/0x2c0 [btrfs]
[ 578.715828] RSP <ffff8fd7db15fa08>
[ 578.715828] CR2: fffffffffffffe50
[ 578.715830] ---[ end trace 3153f530aca9e6aa ]---
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