Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 9669f51de5c0c93e79257f690d1feaf16ebc179b ("xfs: consolidate the eofblocks and cowblocks workers") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: xfstests version: xfstests-x86_64-73c0871-1_20210114 with following parameters: disk: 4HDD fs: xfs test: xfs-reflink-11 ucode: 0x28 test-description: xfstests is a regression test suite for xfs and other files ystems. test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git on test machine: 8 threads Intel(R) Core(TM) i7-4790 v3 @ 3.60GHz with 6G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; 2021-02-11 13:16:36 export TEST_DIR=/fs/sda1 2021-02-11 13:16:36 export TEST_DEV=/dev/sda1 2021-02-11 13:16:36 export FSTYP=xfs 2021-02-11 13:16:36 export SCRATCH_MNT=/fs/scratch 2021-02-11 13:16:36 mkdir /fs/scratch -p 2021-02-11 13:16:36 export SCRATCH_DEV=/dev/sda4 2021-02-11 13:16:36 export SCRATCH_LOGDEV=/dev/sda2 2021-02-11 13:16:36 export SCRATCH_XFS_LIST_METADATA_FIELDS=u3.sfdir3.hdr.parent.i4 2021-02-11 13:16:36 export SCRATCH_XFS_LIST_FUZZ_VERBS=random 2021-02-11 13:16:36 export MKFS_OPTIONS=-mreflink=1 2021-02-11 13:16:36 sed "s:^:xfs/:" //lkp/benchmarks/xfstests/tests/xfs-reflink-11 2021-02-11 13:16:36 ./check xfs/221 xfs/223 xfs/224 xfs/225 xfs/226 xfs/228 xfs/230 xfs/231 xfs/232 xfs/237 xfs/239 FSTYP -- xfs (debug) PLATFORM -- Linux/x86_64 lkp-hsw-d02 5.11.0-rc4-00072-g9669f51de5c0 #1 SMP Thu Feb 11 20:47:30 CST 2021 MKFS_OPTIONS -- -f -mreflink=1 /dev/sda4 MOUNT_OPTIONS -- /dev/sda4 /fs/scratch xfs/221 4s xfs/223 4s xfs/224 4s xfs/225 3s xfs/226 4s xfs/228 4s xfs/230 4s xfs/231 - output mismatch (see /lkp/benchmarks/xfstests/results//xfs/231.out.bad) --- tests/xfs/231.out 2021-01-14 07:40:58.000000000 +0000 +++ /lkp/benchmarks/xfstests/results//xfs/231.out.bad 2021-02-11 13:17:12.313965687 +0000 @@ -1,4 +1,5 @@ QA output created by 231 +cat: /proc/sys/fs/xfs/speculative_cow_prealloc_lifetime: No such file or directory Format and mount Create the original files Compare files @@ -6,11 +7,14 @@ bdbcf02ee0aa977795a79d25fcfdccb1 SCRATCH_MNT/test-231/file2 ... (Run 'diff -u /lkp/benchmarks/xfstests/tests/xfs/231.out /lkp/benchmarks/xfstests/results//xfs/231.out.bad' to see the entire diff) xfs/232 - output mismatch (see /lkp/benchmarks/xfstests/results//xfs/232.out.bad) --- tests/xfs/232.out 2021-01-14 07:40:58.000000000 +0000 +++ /lkp/benchmarks/xfstests/results//xfs/232.out.bad 2021-02-11 13:17:19.162966293 +0000 @@ -1,4 +1,5 @@ QA output created by 232 +cat: /proc/sys/fs/xfs/speculative_cow_prealloc_lifetime: No such file or directory Format and mount Create the original files Compare files @@ -6,11 +7,14 @@ bdbcf02ee0aa977795a79d25fcfdccb1 SCRATCH_MNT/test-232/file2 ... (Run 'diff -u /lkp/benchmarks/xfstests/tests/xfs/232.out /lkp/benchmarks/xfstests/results//xfs/232.out.bad' to see the entire diff) xfs/237 5s xfs/239 5s Ran: xfs/221 xfs/223 xfs/224 xfs/225 xfs/226 xfs/228 xfs/230 xfs/231 xfs/232 xfs/237 xfs/239 Failures: xfs/231 xfs/232 Failed 2 of 11 tests To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp split-job --compatible job.yaml bin/lkp run compatible-job.yaml Thanks, Oliver Sang