FYI, we noticed the following commit (built with gcc-6):

commit: 71fa367c224f4298cd204290fa1728c9d7bd8146 ("Return bytes transfered for partial direct I/O")
url: https://github.com/0day-ci/linux/commits/Goldwyn-Rodrigues/Return-bytes-transfered-for-partial-direct-I-O/20170927-025050


in testcase: xfstests
with following parameters:

	disk: 4HDD
	fs: ext4
	test: generic-299

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: 4 threads Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz with 6G memory

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):




2017-10-06 23:01:29 export TEST_DIR=/fs/sda5
2017-10-06 23:01:29 export TEST_DEV=/dev/sda5
2017-10-06 23:01:29 export FSTYP=ext4
2017-10-06 23:01:29 export SCRATCH_MNT=/fs/scratch
2017-10-06 23:01:29 mkdir /fs/scratch -p
2017-10-06 23:01:29 export SCRATCH_DEV=/dev/sda8
2017-10-06 23:01:29 
2017-10-06 23:01:29 echo generic/299
generic/299
2017-10-06 23:01:29 ./check generic/299
FSTYP         -- ext4
PLATFORM      -- Linux/x86_64 snb-drag 4.14.0-rc2-00001-g71fa367
MKFS_OPTIONS  -- /dev/sda8
MOUNT_OPTIONS -- -o acl,user_xattr /dev/sda8 /fs/scratch

generic/299	 [failed, exit status 1] - output mismatch (see /lkp/benchmarks/xfstests/results//generic/299.out.bad)
    --- tests/generic/299.out	2017-08-04 18:06:58.000000000 +0800
    +++ /lkp/benchmarks/xfstests/results//generic/299.out.bad	2017-10-06 23:05:57.810966461 +0800
    @@ -3,3 +3,5 @@
     Run fio with random aio-dio pattern
     
     Start fallocate/truncate loop
    +failed: '/usr/bin/fio /tmp/4418.fio'
    +(see /lkp/benchmarks/xfstests/results//generic/299.full for details)
    ...
    (Run 'diff -u tests/generic/299.out /lkp/benchmarks/xfstests/results//generic/299.out.bad'  to see the entire diff)
Ran: generic/299
Failures: generic/299
Failed 1 of 1 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 run     job.yaml



Thanks,
Xiaolong