Hi guys, During the night, I started getting the following errors and data was no longer accessible: [Fri Oct 4 08:04:26 2019] btree_readpage_end_io_hook: 2522 callbacks suppressed [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 17686343003259060482 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 254095834002432 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 2574563607252646368 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 17873260189421384017 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 9965805624054187110 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 15108378087789580224 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 7914705769619568652 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 16752645757091223687 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 9617669583708276649 7808404996096 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bad tree block start 3384408928046898608 7808404996096 [Fri Oct 4 08:04:26 2019] btrfs_dev_stat_print_on_error: 159 callbacks suppressed [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174280, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174281, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174282, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174283, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174284, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174285, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174286, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174287, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174288, flush 0, corrupt 0, gen 0 [Fri Oct 4 08:04:26 2019] BTRFS error (device sde2): bdev /dev/sdw2 errs: wr 7, rd 174289, flush 0, corrupt 0, gen 0 Decided to reboot (for another reason) and tried to mount afterwards: [Fri Oct 4 08:29:42 2019] BTRFS info (device sde2): disk space caching is enabled [Fri Oct 4 08:29:42 2019] BTRFS info (device sde2): has skinny extents [Fri Oct 4 08:29:44 2019] BTRFS error (device sde2): parent transid verify failed on 5483020828672 wanted 470169 found 470108 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286352011705795888 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286318771218040112 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286363934109025584 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286229742125204784 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286353230849918256 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286246155688035632 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286321695890425136 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286384677254874416 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286386365024912688 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): bad tree block start 2286284400752608560 5483020828672 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): failed to recover balance: -5 [Fri Oct 4 08:29:45 2019] BTRFS error (device sde2): open_ctree failed The FS info is shown below. It is a RAID6. Label: 'data' uuid: 43472491-7bb3-418c-b476-874a52e8b2b0 Total devices 16 FS bytes used 36.73TiB devid 1 size 7.28TiB used 2.66TiB path /dev/sde2 devid 2 size 3.64TiB used 2.66TiB path /dev/sdf2 devid 3 size 3.64TiB used 2.66TiB path /dev/sdg2 devid 4 size 7.28TiB used 2.66TiB path /dev/sdh2 devid 5 size 3.64TiB used 2.66TiB path /dev/sdi2 devid 6 size 7.28TiB used 2.66TiB path /dev/sdj2 devid 7 size 3.64TiB used 2.66TiB path /dev/sdk2 devid 8 size 3.64TiB used 2.66TiB path /dev/sdl2 devid 9 size 7.28TiB used 2.66TiB path /dev/sdm2 devid 10 size 3.64TiB used 2.66TiB path /dev/sdn2 devid 11 size 7.28TiB used 2.66TiB path /dev/sdo2 devid 12 size 3.64TiB used 2.66TiB path /dev/sdp2 devid 13 size 7.28TiB used 2.66TiB path /dev/sdq2 devid 14 size 7.28TiB used 2.66TiB path /dev/sdr2 devid 15 size 3.64TiB used 2.66TiB path /dev/sds2 devid 16 size 3.64TiB used 2.66TiB path /dev/sdt2 The initial error refers to sdw, so possibly something happened that caused one or more disks in the external cabinet to disappear and reappear. Kernel is 4.18.16-arch1-1-ARCH. Very hesitant to upgrade it, because previously I had to downgrade the kernel to get the volume mounted again. Question: I know that running checks on BTRFS can be dangerous, what can you recommend me doing to get the volume back online? -- Groet / Cheers, Patrick Dijkgraaf
