On Fri, Mar 10, 2017 at 12:23:37PM +0000, 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). Just to answer this question, yes, a newer kernel did indeed do the trick. (I worked out a way of moving disks around that allowed me to boot with a 4.10.1 kernel I'd built earlier). Hugo. > 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. > > 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 ]--- > -- Hugo Mills | "You are demons, and I am in Hell!" "Well, hugo@... carfax.org.uk | technically, it's London, but it's an easy mistake http://carfax.org.uk/ | to make." PGP: E2AB1DE4 | Knight and Connor, Primeval
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