[bug report] fstests failures at btrfs/003 and other test cases

[bug report] fstests failures at btrfs/003 and other test cases

[Shin'ichiro Kawasaki]

Hi David and all,

I found btrfs/003 and other test cases of fstests fail with the latest btrfs-
progs at the devel branch tip. The message "mkfs failed" is observed at the
failures [1]. I bisected and found the btrfs-progs commit below triggers the
failure.

    ec8324cc4b8b ("btrfs-progs: help: adjust alignment of text")

This commit modified the help message of mkfs.btrfs command.

I found fstests checks the help message and greps with the pattern
"[[:space:]]-f[[:space:]|,]" in set_mkfs_prog_path_with_opts() [2]. The grep
succeeds before the commit, since it had spaces before "-f".

$ mkfs.btrfs --help |& grep -e "--force"
    -f, --force               force overwrite of existing filesystem

However, it fails to after the commit, since there is no space before "-f".

$ mkfs.btrfs --help |& grep -e "--force"
-f, --force               force overwrite of existing filesystem

Then, fstests no longer adds -f option to  not add $MKFS_BTRFS_PROGS.

Is this a known failure? If not, actions for fix will be appreciated.



[1]

$ sudo ./check btrfs/003
FSTYP         -- btrfs
PLATFORM      -- Linux/x86_64 redsun115 7.1.0-rc2-kts-btrfs #1 SMP PREEMPT_DYNAMIC Sat May  9 03:03:55 JST 2026
MKFS_OPTIONS  -- -f /dev/nullb1
MOUNT_OPTIONS -- -o enospc_debug -o context=system_u:object_r:root_t:s0 /dev/nullb1 /var/kts/scratch

btrfs/003    55s ... [failed, exit status 1]- output mismatch (see /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.out.bad)
    --- tests/btrfs/003.out     2026-05-09 03:07:52.952213772 +0900
    +++ /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.out.bad     2026-05-09 23:32:17.595751435 +0900
    @@ -1,2 +1,3 @@
     QA output created by 003
    -Silence is golden
    +mkfs failed
    +(see /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.full for details)
    ...
    (Run 'diff -u /home/kts/kernel-test-suite/src/xfstests/tests/btrfs/003.out /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.out.bad'  to see the entire diff)
Ran: btrfs/003
Failures: btrfs/003
Failed 1 of 1 tests


[2] https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/tree/common/config?h=for-next#n106

Re: [bug report] fstests failures at btrfs/003 and other test cases

[Qu Wenruo]

在 2026/5/10 00:15, Shin'ichiro Kawasaki 写道:
> Hi David and all,
> 
> I found btrfs/003 and other test cases of fstests fail with the latest btrfs-
> progs at the devel branch tip. The message "mkfs failed" is observed at the
> failures [1]. I bisected and found the btrfs-progs commit below triggers the
> failure.
> 
>      ec8324cc4b8b ("btrfs-progs: help: adjust alignment of text")
> 
> This commit modified the help message of mkfs.btrfs command.
> 
> I found fstests checks the help message and greps with the pattern
> "[[:space:]]-f[[:space:]|,]" in set_mkfs_prog_path_with_opts() [2]. The grep
> succeeds before the commit, since it had spaces before "-f".
> 
> $ mkfs.btrfs --help |& grep -e "--force"
>      -f, --force               force overwrite of existing filesystem
> 
> However, it fails to after the commit, since there is no space before "-f".
> 
> $ mkfs.btrfs --help |& grep -e "--force"
> -f, --force               force overwrite of existing filesystem
> 
> Then, fstests no longer adds -f option to  not add $MKFS_BTRFS_PROGS.
> 
> Is this a known failure? If not, actions for fix will be appreciated.

Sure, fstest's filter needs to be updated to handle both cases.

I'll send out a fix soon.

Thanks a lot for the report,
Qu

> 
> 
> 
> [1]
> 
> $ sudo ./check btrfs/003
> FSTYP         -- btrfs
> PLATFORM      -- Linux/x86_64 redsun115 7.1.0-rc2-kts-btrfs #1 SMP PREEMPT_DYNAMIC Sat May  9 03:03:55 JST 2026
> MKFS_OPTIONS  -- -f /dev/nullb1
> MOUNT_OPTIONS -- -o enospc_debug -o context=system_u:object_r:root_t:s0 /dev/nullb1 /var/kts/scratch
> 
> btrfs/003    55s ... [failed, exit status 1]- output mismatch (see /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.out.bad)
>      --- tests/btrfs/003.out     2026-05-09 03:07:52.952213772 +0900
>      +++ /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.out.bad     2026-05-09 23:32:17.595751435 +0900
>      @@ -1,2 +1,3 @@
>       QA output created by 003
>      -Silence is golden
>      +mkfs failed
>      +(see /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.full for details)
>      ...
>      (Run 'diff -u /home/kts/kernel-test-suite/src/xfstests/tests/btrfs/003.out /home/kts/kernel-test-suite/src/xfstests/results//btrfs/003.out.bad'  to see the entire diff)
> Ran: btrfs/003
> Failures: btrfs/003
> Failed 1 of 1 tests
> 
> 
> [2] https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/tree/common/config?h=for-next#n106
> 
>