FYI, we noticed the following commit (built with gcc-7): commit: db074436f421967f4f30cfbb6fbc2a728f3e62b3 ("iomap: move the direct IO code into a separate file") https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master in testcase: xfstests with following parameters: disk: 4HDD fs: xfs test: generic-group5 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: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G 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 2019-07-25 10:22:57 export TEST_DIR=/fs/vda 2019-07-25 10:22:57 export TEST_DEV=/dev/vda 2019-07-25 10:22:57 export FSTYP=xfs 2019-07-25 10:22:57 export SCRATCH_MNT=/fs/scratch 2019-07-25 10:22:57 mkdir /fs/scratch -p 2019-07-25 10:22:57 export SCRATCH_DEV=/dev/vdd 2019-07-25 10:22:57 export SCRATCH_LOGDEV=/dev/vdb meta-data=/dev/vda isize=512 agcount=4, agsize=16777216 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=1, rmapbt=0 = reflink=1 data = bsize=4096 blocks=67108864, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0, ftype=1 log =internal log bsize=4096 blocks=32768, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 2019-07-25 10:22:58 export MKFS_OPTIONS=-mreflink=1 2019-07-25 10:22:58 sed "s:^:generic/:" /lkp/lkp/src/pack/xfstests-addon/tests/generic-group5 | grep -F -f merged_ignored_files ignored by lkp: generic/476 2019-07-25 10:22:58 sed "s:^:generic/:" /lkp/lkp/src/pack/xfstests-addon/tests/generic-group5 | grep -v -F -f merged_ignored_files 2019-07-25 10:22:58 ./check generic/445 generic/446 generic/447 generic/448 generic/449 generic/450 generic/451 generic/452 generic/453 generic/454 generic/456 generic/458 generic/459 generic/460 generic/461 generic/463 generic/464 generic/465 generic/466 generic/467 generic/468 generic/469 generic/471 generic/472 generic/473 generic/474 generic/475 generic/477 generic/478 generic/479 generic/480 generic/481 generic/483 generic/484 generic/485 generic/486 generic/487 generic/488 generic/489 generic/490 generic/491 generic/492 generic/493 generic/494 generic/495 generic/496 generic/497 generic/498 generic/499 generic/500 generic/501 generic/502 generic/503 generic/504 generic/505 generic/506 generic/507 generic/508 generic/509 generic/510 generic/511 generic/512 generic/513 generic/514 generic/515 generic/516 generic/517 generic/518 generic/519 generic/520 generic/522 FSTYP -- xfs (debug) PLATFORM -- Linux/x86_64 vm-snb-4G-1884f46d9ec3 5.2.0-08446-gdb074436f42196 #1 SMP Thu Jul 25 07:23:33 CST 2019 MKFS_OPTIONS -- -f -mreflink=1 /dev/vdd MOUNT_OPTIONS -- /dev/vdd /fs/scratch generic/445 1s generic/446 [failed, exit status 1]- output mismatch (see /lkp/benchmarks/xfstests/results//generic/446.out.bad) --- tests/generic/446.out 2019-07-24 19:52:14.000000000 +0800 +++ /lkp/benchmarks/xfstests/results//generic/446.out.bad 2019-07-25 10:23:11.703207317 +0800 @@ -1,2 +1,3 @@ QA output created by 446 Silence is golden +_check_dmesg: something found in dmesg (see /lkp/benchmarks/xfstests/results//generic/446.dmesg) ... (Run 'diff -u /lkp/benchmarks/xfstests/tests/generic/446.out /lkp/benchmarks/xfstests/results//generic/446.out.bad' to see the entire diff) To reproduce: # build kernel cd linux cp config-5.2.0-08446-gdb074436f42196 .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 INSTALL_MOD_PATH= modules_install cd find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k -m modules.cgz job-script # job-script is attached in this email Thanks, Rong Chen