FYI, we noticed the following commit: https://github.com/0day-ci/linux Andrey-Vagin/fs-allow-to-use-dirfd-as-root-for-openat-and-other-at-syscalls/20160618-043537 commit 5368104fdbcf6c4ede18362cc8d3f113c22f6523 ("fs: allow to use dirfd as root for openat and other *at syscalls") in testcase: aim7 with following parameters: load=1000/test=sync_disk_cp on test machine: lkp-a05: Atom with 8G memory caused below changes: sync_disk_cp (2): cannot create /fs/shm/tmpb.0153300000 sync_disk_cp (2): cannot create /fs/shm/tmpb.0153200000 disk1.c: No such file or directory disk1.c: No such file or directory Child #999: : No such file or directory Child #998: : No such file or directory Failed to execute sync_disk_cp /fs/shm To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/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