FYI, we noticed the following commit (built with gcc-7): commit: ddf30cf03fb53b9a0ad0f355a69dbedf416edde9 ("btrfs: extent-tree: Use btrfs_ref to refactor add_pinned_bytes()") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: xfstests with following parameters: disk: 4HDD fs: btrfs test: generic-quick2 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): FSTYP -- btrfs PLATFORM -- Linux/x86_64 vm-snb-4G-727 5.1.0-rc7-00188-gddf30cf MKFS_OPTIONS -- /dev/vdb MOUNT_OPTIONS -- /dev/vdb /fs/scratch generic/088 2s generic/089 14s generic/090 1s generic/091 19s generic/092 3s generic/098 4s generic/100 18s generic/101 0s generic/102- output mismatch (see /lkp/benchmarks/xfstests/results//generic/102.out.bad) --- tests/generic/102.out2019-05-09 15:46:08.000000000 +0800 +++ /lkp/benchmarks/xfstests/results//generic/102.out.bad2019-05-10 09:32:39.267250059 +0800 @@ -1,21 +1,21 @@ QA output created by 102 wrote 838860800/838860800 bytes at offset 0 XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) -wrote 838860800/838860800 bytes at offset 0 +wrote 109576192/838860800 bytes at offset 0 XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 838860800/838860800 bytes at offset 0 ... (Run 'diff -u /lkp/benchmarks/xfstests/tests/generic/102.out /lkp/benchmarks/xfstests/results//generic/102.out.bad' to see the entire diff) generic/103 1s generic/104 1s generic/105 0s generic/106 1s generic/107 1s generic/109 1s generic/120 16s generic/123 1s generic/124 4s generic/126 1s generic/129 6s generic/130 13s If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; To reproduce: # build kernel cd linux cp config-5.1.0-rc7-00188-gddf30cf .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email Thanks, Rong Chen