FYI, we noticed the following commit (built with gcc-7): commit: 71d01519c1dab0f8c00358597259418b91c85d97 ("[PATCH 3/3] shmem: Add support for using full width of ino_t") url: https://github.com/0day-ci/linux/commits/Chris-Down/fs-inode-shmem-Reduce... in testcase: ltp with following parameters: disk: 1HDD fs: btrfs 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; Starting Preprocess NFS configuration... Starting Notify NFS peers of a restart... Starting NFS status monitor for NFSv2/3 locking.... [ 283.268352] device-mapper: uevent: version 1.0.3 [ 283.290118] device-mapper: ioctl: 4.41.0-ioctl (2019-09-16) initialised: dm-devel(a)redhat.com [ 283.836343] raid6: sse2x4 gen() 1210 MB/s [ 283.868301] raid6: sse2x4 xor() 515 MB/s [ 283.896218] raid6: sse2x2 gen() 851 MB/s [ 283.921097] raid6: sse2x2 xor() 830 MB/s [ 283.946222] raid6: sse2x1 gen() 886 MB/s [ 283.976265] raid6: sse2x1 xor() 416 MB/s [ 283.984951] raid6: using algorithm sse2x4 gen() 1210 MB/s [ 283.994221] raid6: .... xor() 515 MB/s, rmw enabled [ 284.002807] raid6: using ssse3x2 recovery algorithm [ 284.173524] xor: measuring software checksum speed [ 284.193055] prefetch64-sse: 1924.000 MB/sec [ 284.211081] generic_sse: 1668.000 MB/sec [ 284.219630] xor: using function: prefetch64-sse (1924.000 MB/sec) [ 285.075525] Btrfs loaded, crc32c=crc32c-intel [ 285.092791] BTRFS: device fsid 8a4aa4b2-b3e2-49b7-9787-ab29baba7d65 devid 1 transid 5 /dev/vda scanned by mkfs.btrfs (2114) [ 285.258397] BTRFS info (device vda): disk space caching is enabled [ 285.274572] BTRFS info (device vda): has skinny extents [ 285.284100] BTRFS info (device vda): flagging fs with big metadata feature [ 285.328783] BTRFS info (device vda): creating UUID tree [ 287.495662] random: crng init done [ 287.504060] random: 7 urandom warning(s) missed due to ratelimiting [ 288.275524] tmpfs: Cannot retroactively change inode number size [ 309.085960] RESULT_ROOT=/result/ltp/1HDD-btrfs-syscalls_part2/vm-snb/debian-x86_64-2019-11-14.cgz/x86_64-rhel-7.6/gcc-7/71d01519c1dab0f8c00358597259418b91c85d97/6 [ 309.086117] [ 309.210318] job=/lkp/jobs/scheduled/vm-snb-05112554ca82/ltp-1HDD-btrfs-syscalls_part2-debian-x86_64-2019-11-14.cgz-71d01519c1da-20200102-6443-1lnq9no-5.yaml [ 309.210349] [ 324.327957] mount: /tmp not mounted or bad option [ 324.328053] [ 324.396507] [ 326.688276] loop: module loaded [ 327.100421] LTP: starting getcpu01 [ 327.293958] LTP: starting getcwd01 [ 327.436766] LTP: starting getcwd02 [ 327.610399] LTP: starting getcwd03 [ 327.728710] LTP: starting getcwd04 [ 332.773960] LTP: starting getdents01 [ 332.809863] LTP: starting getdents02 [ 332.832823] LTP: starting getdents01_64 (getdents01 -l) [ 332.867825] LTP: starting getdents02_64 (getdents02 -l) [ 332.895723] LTP: starting getdomainname01 [ 332.927956] LTP: starting getdtablesize01 [ 333.042341] LTP: starting getegid01 [ 333.094931] LTP: starting getegid01_16 [ 333.133468] LTP: starting getegid02 [ 333.179952] LTP: starting getegid02_16 [ 333.246218] LTP: starting geteuid01 [ 333.297136] LTP: starting geteuid01_16 [ 333.332723] LTP: starting geteuid02 [ 333.383650] LTP: starting geteuid02_16 [ 333.412026] LTP: starting getgid01 [ 333.458224] LTP: starting getgid01_16 [ 333.488229] LTP: starting getgid03 [ 333.514683] LTP: starting getgid03_16 [ 333.535995] LTP: starting getgroups01 [ 333.593485] LTP: starting getgroups01_16 [ 333.656728] LTP: starting getgroups03 [ 333.711282] LTP: starting getgroups03_16 [ 333.739738] LTP: starting gethostbyname_r01 [ 333.787831] LTP: starting gethostid01 [ 333.982985] LTP: starting gethostname01 [ 334.030574] LTP: starting getitimer01 [ 334.091122] LTP: starting getitimer02 [ 334.132547] LTP: starting getitimer03 [ 334.186680] LTP: starting getpagesize01 [ 334.223682] LTP: starting getpeername01 [ 334.288736] LTP: starting getpgid01 [ 334.323573] LTP: starting getpgid02 [ 334.348305] LTP: starting getpgrp01 [ 334.392548] LTP: starting getpid01 [ 334.423675] LTP: starting getpid02 [ 334.448407] LTP: starting getppid01 [ 334.490205] LTP: starting getppid02 [ 334.513650] LTP: starting getpriority01 [ 334.570751] LTP: starting getpriority02 [ 334.634491] LTP: starting getrandom01 [ 340.025393] In some cases useful info is found in syslog - try [ 340.025487] [ 340.079513] dmesg | tail or so. [ 340.079545] [ 340.539720] result_service=inn:/result, RESULT_MNT=/inn/result, RESULT_ROOT=/inn/result/ltp/1HDD-btrfs-syscalls_part2/vm-snb/debian-x86_64-2019-11-14.cgz/x86_64-rhel-7.6/gcc-7/71d01519c1dab0f8c00358597259418b91c85d97/6 [ 340.539785] [ 340.602698] mount.nfs: try 1 time... mount.nfs -o vers=3 inn:/result /inn/result To reproduce: # build kernel cd linux cp config-5.5.0-rc3-00003-g71d01519c1dab .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