Trying to tackle https://github.com/kdave/btrfs-progs/issues/541

["Raúl Sánchez Siles" <rasasi78@mailbox.org>]

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Hello!

After a mount error "parent transid verify failed" I went to offline check the 
partition and I came accross this issue. After this, I backup all data I 
could get from the partition (via btrs restore). As a sidenote I also tried 
mounting with the rescue=usebackuproot with the same outcome.

Currently I have a reproducible scenario to look into the issue and provided 
lack of activity in the issue I thought I may be of help to provide more 
information so issue can be fixed. The btrfs consistency issue looks serious 
so even in case of successful debugging I don't expect to recover access to 
that partition.

OS and SW:

- Debian sid
- btrfs-progs 6.17
- linux 6.16.11

Mount error:
[  120.652356] BTRFS: device fsid 06dc5f24-a16f-4520-993a-xxxxxxxxxxxx devid 
1 transid 968758 /dev/sda3 (8:3) scanned by pool-2 (4449)
[  120.653973] BTRFS info (device sda3): first mount of filesystem 06dc5f24-
a16f-4520-993a-xxxxxxxxxxxx
[  120.653994] BTRFS info (device sda3): using crc32c (crc32c-x86) checksum 
algorithm
[  123.225415] BTRFS info (device sda3): start tree-log replay
[  123.523786] BTRFS error (device sda3): parent transid verify failed on 
logical 229603573760 mirror 1 wanted 968173 found 966625
[  123.538334] BTRFS error (device sda3): parent transid verify failed on 
logical 229603573760 mirror 2 wanted 968173 found 966625
[  123.538372] BTRFS error (device sda3): failed to run delayed ref for 
logical 487464960 num_bytes 4096 type 184 action 1 ref_mod 1: -5
[  123.538383] BTRFS error (device sda3 state A): Transaction aborted (error 
-5)
[  123.538387] BTRFS: error (device sda3 state A) in 
btrfs_run_delayed_refs:2159: errno=-5 IO failure
[  123.538395] BTRFS: error (device sda3 state EA) in btrfs_replay_log:2094: 
errno=-5 IO failure (Failed to recover log tree)
[  123.544693] BTRFS error (device sda3 state EA): open_ctree failed: -5

Please CC me as I'm not subscribed to the list.

  Best Regards,
-- 
Raúl Sánchez Siles

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