Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 7b04b5c2d33be36638b78d5584a2b3b1ff1fd3d5 ("btrfs: switch to iomap_dio_rw() for dio") https://github.com/kdave/btrfs-devel.git next/goldwyn/dio-iomap-20200707 in testcase: xfstests with following parameters: disk: 4HDD fs: btrfs test: generic-group22 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 16G 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 <rong.a.chen(a)intel.com&gt; 2020-07-21 11:07:28 export TEST_DIR=/fs/vda 2020-07-21 11:07:28 export TEST_DEV=/dev/vda 2020-07-21 11:07:28 export FSTYP=btrfs 2020-07-21 11:07:28 export SCRATCH_MNT=/fs/scratch 2020-07-21 11:07:28 mkdir /fs/scratch -p 2020-07-21 11:07:28 export SCRATCH_DEV_POOL="/dev/vdb /dev/vdc /dev/vdd" 2020-07-21 11:07:28 sed "s:^:generic/:" //lkp/benchmarks/xfstests/tests/generic-group22 | grep -F -f merged_ignored_files 2020-07-21 11:07:28 sed "s:^:generic/:" //lkp/benchmarks/xfstests/tests/generic-group22 | grep -v -F -f merged_ignored_files 2020-07-21 11:07:28 ./check generic/030 generic/073 generic/104 generic/136 generic/171 generic/203 generic/235 generic/268 generic/300 generic/330 generic/362 generic/395 generic/427 generic/465 generic/501 generic/534 generic/564 generic/594 FSTYP -- btrfs PLATFORM -- Linux/x86_64 vm-snb-122 5.8.0-rc4-00028-g7b04b5c2d33be #1 SMP Tue Jul 14 00:45:47 CST 2020 MKFS_OPTIONS -- /dev/vdb MOUNT_OPTIONS -- /dev/vdb /fs/scratch generic/030 3s generic/073 3s generic/104 2s generic/136 2s generic/171 4s generic/203 3s generic/235 [not run] disk quotas not supported by this filesystem type: btrfs generic/268 5s generic/300 92s generic/330 6s generic/362 [not run] this test requires richacl support on $SCRATCH_DEV generic/395 [not run] No encryption support for btrfs generic/427 11s generic/465 - output mismatch (see /lkp/benchmarks/xfstests/results//generic/465.out.bad) --- tests/generic/465.out 2020-06-19 03:26:43.000000000 +0000 +++ /lkp/benchmarks/xfstests/results//generic/465.out.bad 2020-07-21 11:10:02.566000000 +0000 @@ -1,3 +1,4 @@ QA output created by 465 non-aio dio test aio-dio test +encounter an error: block 66 offset 0, content 0 ... (Run 'diff -u /lkp/benchmarks/xfstests/tests/generic/465.out /lkp/benchmarks/xfstests/results//generic/465.out.bad' to see the entire diff) generic/501 3s generic/534 2s generic/564 [not run] xfs_io copy_range doesn't support -f generic/594 [not run] disk quotas not supported by this filesystem type: btrfs Ran: generic/030 generic/073 generic/104 generic/136 generic/171 generic/203 generic/235 generic/268 generic/300 generic/330 generic/362 generic/395 generic/427 generic/465 generic/501 generic/534 generic/564 generic/594 Not run: generic/235 generic/362 generic/395 generic/564 generic/594 Failures: generic/465 Failed 1 of 18 tests To reproduce: # build kernel cd linux cp config-5.8.0-rc4-00028-g7b04b5c2d33be .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install cd <mod-install-dir> 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 <bzImage> -m modules.cgz job-script # job-script is attached in this email Thanks, Rong Chen