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definitions=main-2409200079 X-Proofpoint-GUID: -yCH95wIR31NPZD2x6o0oiwWVdvHPfxn X-Proofpoint-ORIG-GUID: -yCH95wIR31NPZD2x6o0oiwWVdvHPfxn On 12/9/24 8:45 pm, fdmanana@kernel.org wrote: > From: Filipe Manana > > When running btrfs/321 with compression enabled it fails like this: > > $ MOUNT_OPTIONS="-o compress" ./check btrfs/321 > FSTYP -- btrfs > PLATFORM -- Linux/x86_64 debian0 6.11.0-rc7-btrfs-next-174+ #1 SMP PREEMPT_DYNAMIC Tue Sep 10 17:11:38 WEST 2024 > MKFS_OPTIONS -- /dev/sdc > MOUNT_OPTIONS -- -o compress /dev/sdc /home/fdmanana/btrfs-tests/scratch_1 > > btrfs/321 2s ... [failed, exit status 1]- output mismatch (see /home/fdmanana/git/hub/xfstests/results//btrfs/321.out.bad) > --- tests/btrfs/321.out 2024-09-12 12:12:11.259272125 +0100 > +++ /home/fdmanana/git/hub/xfstests/results//btrfs/321.out.bad 2024-09-12 13:18:40.231120012 +0100 > @@ -1,2 +1,5 @@ > QA output created by 321 > -Silence is golden > +mount: /home/fdmanana/btrfs-tests/scratch_1: can't read superblock on /dev/sdc. > + dmesg(1) may have more information after failed mount system call. > +mount -o compress -o ro /dev/sdc /home/fdmanana/btrfs-tests/scratch_1 failed > +(see /home/fdmanana/git/hub/xfstests/results//btrfs/321.full for details) > ... > (Run 'diff -u /home/fdmanana/git/hub/xfstests/tests/btrfs/321.out /home/fdmanana/git/hub/xfstests/results//btrfs/321.out.bad' to see the entire diff) > > HINT: You _MAY_ be missing kernel fix: > 10d9d8c3512f btrfs: fix a use-after-free bug when hitting errors inside btrfs_submit_chunk() > > Ran: btrfs/321 > Failures: btrfs/321 > Failed 1 of 1 tests > > This is because with compression enabled we get a csum tree that has only > one leaf, and that leaf is the root of the csum tree. That means that > after the test corrupts the leaf, the next mount will fail since an error > loading the root is critical and makes the mount operation fail. > > Fix this by creating a file with 128M of data instead of 32M, as this > guarantees that even if compression is enabled, and even with the maximum > allowed leaf size (64K), we still get a csum tree with multiple leaves, > making the test work. > > Signed-off-by: Filipe Manana looks good. Reviewed-by: Anand Jain