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charset=us-ascii Content-Disposition: inline Hi all, I found xfs/078 failure with null_blk devices [1]. When I saw the failure for the first time, it was observed with regular null_blk with 8GB size with 512 bytes sector size. Later on, I was able to recreate with, - both zoned and non-zoned - both 512 byte sector and 4KB sector - device size from 1GB to 8GB The failure was recreated on QEMU VM test nodes. When I reduce the number of CPUs assigned to the VM, the test case succeeded. With larger number of CPUs, the test case failed. nproc | 16 | 8 | 2 | 1 ---------+------+------+------+------ xfs/078 | fail | fail | pass | pass I attach 078.dmesg, 078.full and 078.out.bad for your reference. Actions for fix will be appreciated. If I can do anything on my testnodes, please let me know. [1] local.config, command line and outputs $ 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 /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 FSTYP -- xfs (non-debug) PLATFORM -- Linux/x86_64 redsun71q 7.1.0-rc1-kts-xfs-g509fdeb3326+ #1 SMP PREEMPT_DYNAMIC Fri May 15 20:16:28 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 - output mismatch (see /home/shin/kts/kernel-test-suite/src/xfstests/results//xfs/078.out.bad) --- tests/xfs/078.out 2026-05-18 14:56:44.108307737 +0900 +++ /home/shin/kts/kernel-test-suite/src/xfstests/results//xfs/078.out.bad 2026-05-22 20:16:11.735184759 +0900 @@ -188,6 +188,6 @@ *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 -data blocks changed from 268435456 to 4194304001 +data blocks changed from 268435456 to 4194304000 *** unmount *** all done ... (Run 'diff -u /home/shin/kts/kernel-test-suite/src/xfstests/tests/xfs/078.out /home/shin/kts/kernel-test-suite/src/xfstests/results//xfs/078.out.bad' to see the entire diff) Ran: xfs/078 Failures: xfs/078 Failed 1 of 1 tests --mqsotgwkaasgl7yf Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="078.dmesg" [346638.550194] [ T32208] run fstests xfs/078 at 2026-05-22 20:15:44 [346642.710896] [ T33162] loop0: detected capacity change from 0 to 1344192 [346643.022555] [ T877] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346643.055173] [ T33175] loop0: detected capacity change from 0 to 2688392 [346643.144484] [ T33177] XFS (loop0): Mounting V5 Filesystem 746f0e35-30af-4136-b531-73e95ad87a3c [346643.203081] [ T33177] XFS (loop0): Ending clean mount [346643.338548] [ T33191] XFS (loop0): Unmounting Filesystem 746f0e35-30af-4136-b531-73e95ad87a3c [346644.011082] [ T33454] loop0: detected capacity change from 0 to 672096 [346644.368598] [ T33466] loop0: detected capacity change from 0 to 2688388 [346644.470308] [ T33468] XFS (loop0): Mounting V5 Filesystem cc06080b-270c-4433-8dad-a753fdbddec6 [346644.525640] [ T33468] XFS (loop0): Ending clean mount [346644.734001] [ T33482] XFS (loop0): Unmounting Filesystem cc06080b-270c-4433-8dad-a753fdbddec6 [346645.477586] [ T33825] loop0: detected capacity change from 0 to 336048 [346645.739019] [ T325] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346645.790943] [ T33837] loop0: detected capacity change from 0 to 1344202 [346645.891977] [ T33838] XFS (loop0): Mounting V5 Filesystem b54ad8c9-18b8-42c2-ad83-9be584f2c84a [346645.931163] [ T33838] XFS (loop0): Ending clean mount [346646.162087] [ T33852] XFS (loop0): Unmounting Filesystem b54ad8c9-18b8-42c2-ad83-9be584f2c84a [346646.827080] [ T34195] loop0: detected capacity change from 0 to 2147483648 [346647.612577] [ T34208] loop1: detected capacity change from 0 to 5242880008 [346647.623323] [ T586] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346647.721646] [ T34210] XFS (loop1): Mounting V5 Filesystem 86a92b03-765d-4e48-8329-4c4e03faf40c [346647.770548] [ T34210] XFS (loop1): Ending clean mount [346648.067951] [ T34225] XFS (loop1): Unmounting Filesystem 86a92b03-765d-4e48-8329-4c4e03faf40c [346648.150529] [ C0] clocksource: Watchdog remote CPU 10 read timed out [346648.295566] [ T34233] loop0: detected capacity change from 0 to 2147483648 [346649.178443] [ T34246] loop0: detected capacity change from 0 to 7340032008 [346649.272214] [ T34247] XFS (loop0): Mounting V5 Filesystem 386bf672-1e2e-45c2-918d-2bd8e2710011 [346649.341180] [ T34247] XFS (loop0): Ending clean mount [346649.714697] [ T34261] XFS (loop0): Unmounting Filesystem 386bf672-1e2e-45c2-918d-2bd8e2710011 [346649.949635] [ T34269] loop0: detected capacity change from 0 to 2147483648 [346650.819597] [ T34282] loop1: detected capacity change from 0 to 9437184008 [346650.834446] [ T1008] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346650.929310] [ T34284] XFS (loop1): Mounting V5 Filesystem ad2552a4-4051-48b3-86af-0b9edfe28bb0 [346650.989257] [ T34284] XFS (loop1): Ending clean mount [346651.486306] [ T34297] XFS (loop1): Unmounting Filesystem ad2552a4-4051-48b3-86af-0b9edfe28bb0 [346651.647242] [ T586] I/O error, dev loop1, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346651.709163] [ T34305] loop0: detected capacity change from 0 to 2147483648 [346652.577727] [ T34318] loop0: detected capacity change from 0 to 11534336008 [346652.677599] [ T34319] XFS (loop0): Mounting V5 Filesystem 766eb1b8-e80f-4ad6-ac35-c98cc6fd4195 [346652.734701] [ T34319] XFS (loop0): Ending clean mount [346653.283152] [ T34333] XFS (loop0): Unmounting Filesystem 766eb1b8-e80f-4ad6-ac35-c98cc6fd4195 [346653.507118] [ T34341] loop0: detected capacity change from 0 to 2147483648 [346654.329581] [ T34354] loop1: detected capacity change from 0 to 17825792008 [346654.343237] [ T769] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346654.426162] [ T34356] XFS (loop1): Mounting V5 Filesystem d60fa45a-6533-474d-baad-72b19ae6f2d3 [346654.480317] [ T34356] XFS (loop1): Ending clean mount [346655.388320] [ T34370] XFS (loop1): Unmounting Filesystem d60fa45a-6533-474d-baad-72b19ae6f2d3 [346655.601878] [ T34378] loop0: detected capacity change from 0 to 2147483648 [346656.427245] [ T34392] loop1: detected capacity change from 0 to 19922944008 [346656.521749] [ T34394] XFS (loop1): Mounting V5 Filesystem c4780098-6c34-4553-ae2c-837f4b6d2c8d [346656.567558] [ T34394] XFS (loop1): Ending clean mount [346657.505756] [ T34408] XFS (loop1): Unmounting Filesystem c4780098-6c34-4553-ae2c-837f4b6d2c8d [346657.727715] [ T34416] loop0: detected capacity change from 0 to 2147483648 [346658.433332] [ T34429] loop1: detected capacity change from 0 to 32505856008 [346658.450508] [ T768] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346658.530546] [ T34431] XFS (loop1): Mounting V5 Filesystem ebfe392b-8c01-4080-9174-fd1ff3ba0a72 [346658.597583] [ T34431] XFS (loop1): Ending clean mount [346660.061005] [ T34444] XFS (loop1): Unmounting Filesystem ebfe392b-8c01-4080-9174-fd1ff3ba0a72 [346660.305255] [ T34452] loop0: detected capacity change from 0 to 2147483648 [346661.064456] [ T34465] loop1: detected capacity change from 0 to 33554432008 [346661.077366] [ T325] I/O error, dev loop0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 2 [346661.168596] [ T34467] XFS (loop1): Mounting V5 Filesystem ee62fee9-3c2e-4f9f-9f7d-81d108f36128 [346661.222539] [ T34467] XFS (loop1): Ending clean mount [346662.772152] [ T34482] XFS (loop1): Unmounting Filesystem ee62fee9-3c2e-4f9f-9f7d-81d108f36128 [346665.103767] [ T34652] XFS (nullb0): Unmounting Filesystem 9d6146a4-9265-4658-a98c-d11b0cf45328 [346665.500646] [ T34860] XFS (nullb0): Mounting V5 Filesystem 9d6146a4-9265-4658-a98c-d11b0cf45328 [346665.527151] [ T34860] XFS (nullb0): Ending clean mount --mqsotgwkaasgl7yf Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="078.full" umount: /var/kts/test/078.mnt: not mounted. umount: /dev/nullb1: not mounted. --mqsotgwkaasgl7yf Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="078.out.bad" QA output created by 078 *** create loop mount point === GROWFS (from 688226304 to 1376452608, 4096 blocksize) *** mkfs loop file (size=688226304) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 1376452608 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=168024 data blocks changed from 168024 to 336048 *** unmount *** check === GROWFS (from 344113152 to 1376452608, 2048 blocksize) *** mkfs loop file (size=344113152) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 2048/2048 bytes at offset 1376452608 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=2048 --Blocks=168024 data blocks changed from 168024 to 672096 *** unmount *** check === GROWFS (from 172056576 to 688230400, 1024 blocksize) *** mkfs loop file (size=172056576) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 1024/1024 bytes at offset 688230400 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=1024 --Blocks=168024 data blocks changed from 168024 to 672096 *** unmount *** check === GROWFS (from 1t to 2500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 2684354560000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 655360001 *** unmount === GROWFS (from 1t to 3500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 3758096384000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 917504001 *** unmount === GROWFS (from 1t to 4500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 4831838208000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 1179648001 *** unmount === GROWFS (from 1t to 5500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 5905580032000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 1441792001 *** unmount === GROWFS (from 1t to 8500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 9126805504000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 2228224001 *** unmount === GROWFS (from 1t to 9500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 10200547328000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 2490368001 *** unmount === GROWFS (from 1t to 15500g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 16642998272000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 4063232001 *** unmount === GROWFS (from 1t to 16000g, 4096 blocksize) *** mkfs loop file (size=1t) meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks data = bsize=XXX blocks=XXX, imaxpct=PCT = sunit=XXX swidth=XXX, unwritten=X naming =VERN bsize=XXX log =LDEV bsize=XXX blocks=XXX realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX *** extend loop file wrote 4096/4096 bytes at offset 17179869184000 *** mount loop filesystem *** grow loop filesystem xfs_growfs --BlockSize=4096 --Blocks=268435456 data blocks changed from 268435456 to 4194304000 *** unmount *** all done --mqsotgwkaasgl7yf--