FYI, we noticed the following commit (built with gcc-7):

commit: 73e5fff98b6446de1490a8d7809121b0108d49f4 ("xfs: switch to use the new mount-api")
https://git.kernel.org/cgit/fs/xfs/xfs-linux.git xfs-5.5-merge

in testcase: ltp
with following parameters:

	disk: 1HDD
	fs: xfs
	test: fs-03

test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features.
test-url: http://linux-test-project.github.io/


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

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@intel.com>

[  135.976643] LTP: starting fs_fill
[  135.993912] /dev/zero: Can't open blockdev
[  136.020327] raid6: sse2x4   gen() 14769 MB/s
[  136.037281] raid6: sse2x4   xor()  8927 MB/s
[  136.054236] raid6: sse2x2   gen() 12445 MB/s
[  136.071397] raid6: sse2x2   xor()  7441 MB/s
[  136.089313] raid6: sse2x1   gen() 10089 MB/s
[  136.107334] raid6: sse2x1   xor()  7201 MB/s
[  136.108198] raid6: using algorithm sse2x4 gen() 14769 MB/s
[  136.109320] raid6: .... xor() 8927 MB/s, rmw enabled
[  136.111966] raid6: using ssse3x2 recovery algorithm
[  136.122740] xor: automatically using best checksumming function   avx       
[  136.187956] Btrfs loaded, crc32c=crc32c-intel
[  136.216946] fuse: init (API version 7.31)
[  136.327654] EXT4-fs (loop0): mounting ext2 file system using the ext4 subsystem
[  136.334974] EXT4-fs (loop0): mounted filesystem without journal. Opts: (null)
[  136.338933] Mounted ext2 file system at /tmp/ltp-bl4kncm4Ti/g2oJfj/mntpoint supports timestamps until 2038 (0x7fffffff)
[  137.897422] EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem
[  137.908242] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null)
[  137.910111] Mounted ext3 file system at /tmp/ltp-bl4kncm4Ti/g2oJfj/mntpoint supports timestamps until 2038 (0x7fffffff)


To reproduce:

        # build kernel
	cd linux
	cp config-5.4.0-rc3-00117-g73e5fff98b644 .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=<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