There is quite of noise currently with xfstests failures. In addition to the fsync/EIO failures, there is also something going on with dm-thin, etc. And then there's generic/484, which is failing for all ext4 configs. According to test script for generic/484, the test failure is fixed by the patch: locks: change POSIX lock ownership on execve when files_struct is displaced >From what I can tell, the patch was last submitted on March 17th, with comments from Eric Beiderman on April 2nd and 3rd --- but nothing since then: https://lists.gt.net/linux/kernel/2941364 Are you still hoping to land this patch for 4.17? Thanks, regards, - Ted