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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