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I also tried each of "-d concurrency=0", "-l concurrency=0" > > and "-r concurrency=0" seperately, and observed the same failures. I used the > > kernel at xfs/for-next on Jun/12 and fstests tag v2026.05.17. The fstests > > alraday has the commit by Lukas ffc8bad17e5b ("xfs/21{6,7} Use default -l > > concurrency=0 on mkfs.xfs that supports it"). > > Both xfs/078 and xfs/216 don't actually use MKFS_OPTIONS :( > > Can you try the quick hack patch below: > > diff --git a/tests/xfs/078 b/tests/xfs/078 > index 6057aeea1..c477f6cfb 100755 > --- a/tests/xfs/078 > +++ b/tests/xfs/078 > @@ -57,7 +57,7 @@ _grow_loop() > $XFS_IO_PROG -f -c "truncate $original" $LOOP_IMG > loop_dev=`_create_loop_device $LOOP_IMG $bsize` > > - dparam="" > + dparam="-d concurrency=0 -l concurrency=0 -r concurrency=0" > if [ -n "$agsize" ]; then > dparam="-d agsize=$agsize" > fi > diff --git a/tests/xfs/216 b/tests/xfs/216 > index 1749647c1..ded3d30af 100755 > --- a/tests/xfs/216 > +++ b/tests/xfs/216 > @@ -22,11 +22,7 @@ _cleanup() > > _require_scratch > _scratch_mkfs_xfs >/dev/null 2>&1 > -if _scratch_mkfs_xfs_supports_concurrency -l >> $seqres.full 2>&1; then > - loop_mkfs_opts="-l concurrency=0" > -else > - loop_mkfs_opts="" > -fi > +loop_mkfs_opts="-d concurrency=0 -l concurrency=0 -r concurrency=0" > _scratch_mount > > _require_loop Thanks. With the patch above, the failures disappeared! $ cat ./local.config export TEST_DIR=/var/kts/test export TEST_DEV="/dev/nullb0" export KEEP_DMESG=yes export FSTYP=xfs export MKFS_OPTIONS="" export SCRATCH_MNT=/var/kts/scratch export SCRATCH_DEV="/dev/nullb1" export FSX_AVOID=-a $ sudo mkfs.xfs -f /dev/nullb0 meta-data=/dev/nullb0 isize=512 agcount=4, agsize=524288 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=1, rmapbt=1 = reflink=1 bigtime=1 inobtcount=1 nrext64=1 = exchange=1 metadir=0 data = bsize=4096 blocks=2097152, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0, ftype=1, parent=1 log =internal log bsize=4096 blocks=16384, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 = rgcount=0 rgsize=0 extents = zoned=0 start=0 reserved=0 $ sudo ./check xfs/078 xfs/216 FSTYP -- xfs (non-debug) PLATFORM -- Linux/x86_64 redsun71q 7.1.0-rc4-kts-xfs-g804826eac53+ #1 SMP PREEMPT_DYNAMIC Mon Jun 15 09:31:13 JST 2026 MKFS_OPTIONS -- -f /dev/nullb1 MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0 /dev/nullb1 /var/kts/scratch xfs/078 13s ... 13s xfs/216 8s ... 7s Ran: xfs/078 xfs/216 Passed all 2 tests