FYI, we noticed the following commit (built with gcc-7): commit: 079f9927c7bfa026d963db1455197159ebe5b534 ("ext4: gracefully handle ext4_break_layouts() failure during truncate") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: ltp with following parameters: disk: 1HDD fs: xfs test: syscalls_part2 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(a)intel.com&gt; <<<test_start>>> tag=mmap16 stime=1559078706 cmdline="mmap16" contacts="" analysis=exit <<<test_output>>> mke2fs 1.43.4 (31-Jan-2017) mmap16 0 TINFO : Using test device LTP_DEV='/dev/loop0' mmap16 0 TINFO : Formatting /dev/loop0 with ext4 opts='-b 1024' extra opts='10240' mmap16 1 TFAIL : mmap16.c:85: Bug is reproduced! <<<execution_status>>> initiation_status="ok" duration=8 termination_type=exited termination_id=1 corefile=no cutime=11 cstime=345 <<<test_end>>> To reproduce: # build kernel cd linux cp config-5.1.0-rc3-00039-g079f992 .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