Hi list,
I have a RAID1 Btrfs (on sdb and sdc) behind bcache (on nvme0n1p4):
[jdg@tiare ~]$ lsblk -o NAME,UUID,SIZE,MOUNTPOINT
NAME UUID SIZE MOUNTPOINT
sdb 8ae3c26b-6932-4dad-89bc-569ae2c74366 3,7T
└─bcache1 c5b8386b-b81d-4473-9340-7b8a74fc3a3c 3,7T
sdc 7ccac426-dc8c-4cb3-9e64-13b1cf48d4bf 3,7T
└─bcache0 c5b8386b-b81d-4473-9340-7b8a74fc3a3c 3,7T
nvme0n1 119,2G
├─nvme0n1p1 1725-D2D0 512M /boot/efi
├─nvme0n1p2 d3cc080c-0c3f-4191-a25d-7c419e00316a 40G /
├─nvme0n1p3 572b43a3-7690-4daa-beeb-d1c030f194e8 16G [SWAP]
└─nvme0n1p4 a3ed0098-36b4-46a6-8e38-efe9b9a94e52 62,8G <- bcache
The Btrfs filesystem is used for /home (one subvolume per user).
An error happened during the nightly backup on nvme0 (see below) and
Btrfs went readonly. After reboot, it refused to mount.
I'm on Fedora-32 with kernel-5.9.7, and I compiled latest btrfs-progs:
[root@tiare btrfs-progs-5.9]# ./btrfs -v check /dev/bcache0
Opening filesystem to check...
parent transid verify failed on 3010317451264 wanted 29647859 found 29647852
parent transid verify failed on 3010317451264 wanted 29647859 found 29647852
parent transid verify failed on 3010317451264 wanted 29647859 found 29647852
Ignoring transid failure
ERROR: could not setup extent tree
ERROR: cannot open file system
I have restored from backups on a different disk, but still, I would be
interested in trying to restore the broken filesystem.
I have posted this message on Btrfs mailing list already. The advice was
to seek for help here: what should I try? Detach both HDD from bcache?
Create loopdev on both HDD with losetup -o 8192, then try to mount?
/var/log/messages :
Nov 11 00:24:28 tiare kernel: nvme nvme0: I/O 0 QID 5 timeout, aborting
Nov 11 00:24:28 tiare kernel: nvme nvme0: I/O 1 QID 5 timeout, aborting
Nov 11 00:24:28 tiare kernel: nvme nvme0: I/O 2 QID 5 timeout, aborting
Nov 11 00:24:28 tiare kernel: nvme nvme0: Abort status: 0x0
Nov 11 00:24:28 tiare kernel: nvme nvme0: I/O 3 QID 5 timeout, aborting
Nov 11 00:24:28 tiare kernel: nvme nvme0: I/O 4 QID 5 timeout, aborting
...
Nov 11 00:24:58 tiare kernel: nvme nvme0: I/O 0 QID 5 timeout, reset
controller
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 153333328 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from
cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 153333344 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 153333384 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 153333424 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 153333464 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 153333520 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 142766872 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_io_errors() nvme0n1p4:
IO error on reading from cache, recovering.
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 142766888 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: bcache: bch_cache_set_error() error on
db563a68-d350-4eaf-978b-eee7095543c5: nvme0n1p4: too many IO errors
reading from cache#012, disabling caching
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 142766912 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 1, rd 0, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: blk_update_request: I/O error, dev
nvme0n1, sector 142766936 op 0x0:(READ) flags 0x80700 phys_seg 1 prio
class 0
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache1 errs: wr 1, rd 0, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 2, rd 0, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache1 errs: wr 2, rd 0, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: bcache: conditional_stop_bcache_device()
stop_when_cache_set_failed of bcache1 is "auto" and cache is dirty, stop
it to avoid potential data corruption.
Nov 11 00:24:58 tiare kernel: bcache: conditional_stop_bcache_device()
stop_when_cache_set_failed of bcache0 is "auto" and cache is dirty, stop
it to avoid potential data corruption.
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 3, rd 1, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 3, rd 2, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 3, rd 3, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 3, rd 4, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: BTRFS error (device bcache0): bdev
/dev/bcache0 errs: wr 3, rd 5, flush 0, corrupt 0, gen 0
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: bcache: bch_count_backing_io_errors() sdc:
Read-ahead I/O failed on backing device, ignore
Nov 11 00:24:58 tiare kernel: nvme nvme0: 8/0/0 default/read/poll queues
Thanks,
--
Jean-Denis Girard
SysNux Systèmes Linux en Polynésie française
https://www.sysnux.pf/ Tél: +689 40.50.10.40 / GSM: +689 87.797.527
