+David Howells On 2018/08/06 20:32, Michal Hocko wrote: > On Mon 06-08-18 04:27:02, syzbot wrote: >> Hello, >> >> syzbot has tested the proposed patch and the reproducer did not trigger >> crash: >> >> Reported-and-tested-by: >> syzbot+bab151e82a4e973fa325@xxxxxxxxxxxxxxxxxxxxxxxxx >> >> Tested on: >> >> commit: 8c8399e0a3fb Add linux-next specific files for 20180806 >> git tree: linux-next >> kernel config: https://syzkaller.appspot.com/x/.config?x=1b6bc1781e49e93e >> compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> patch: https://syzkaller.appspot.com/x/patch.diff?x=14fe18e2400000 >> >> Note: testing is done by a robot and is best-effort only. > > OK, so this smells like a problem in the previous group oom changes. Or > maybe it is not very easy to reproduce? > Since I can't find mm related changes between next-20180803 (syzbot can reproduce) and next-20180806 (syzbot has not reproduced), I can't guess what makes this problem go away. But since this problem did not occur for 3.5 hours on next-20180806 (when this problem was occurring once per 60-90 minutes), the reproducer might not be working as intended due to "kernfs, sysfs, cgroup, intel_rdt: Support fs_context" or something... ./kernel/cgroup/cgroup-internal.h | 3 ./kernel/cgroup/cgroup-v1.c | 211 ./kernel/cgroup/cgroup.c | 81
