>> Now i realized that i forgot to remove UID from that cgroup before >> trying to remove it, so cgroup cannot be removed anyway (we are using >> third party cgroup called cgroup-uid from Andrea Righi, which is able >> to associate all user's processes with target cgroup). Look here for >> cgroup-uid patch: >> https://www.develer.com/~arighi/linux/patches/cgroup-uid/cgroup-uid-v8.patch >> >> ANYWAY, i'm 101% sure that 'tasks' file was empty and 'under_oom' was >> permanently '1'. > >This is really strange. Could you post the whole diff against stable >tree you are using (except for grsecurity stuff and the above cgroup-uid >patch)? Here are all patches which i applied to kernel 3.2.48 in my last test: http://watchdog.sk/lkml/patches3/ Patches marked as 7-* are from Johannes. I'm appling them in order except the grsecurity - it goes as first. azur >Btw. the bellow patch might help us to point to the exit path which >leaves wait_on_memcg without mem_cgroup_oom_synchronize: >--- >diff --git a/kernel/exit.c b/kernel/exit.c >index e6e01b9..ad472e0 100644 >--- a/kernel/exit.c >+++ b/kernel/exit.c >@@ -895,6 +895,7 @@ NORET_TYPE void do_exit(long code) > > profile_task_exit(tsk); > >+ WARN_ON(current->memcg_oom.wait_on_memcg); > WARN_ON(blk_needs_flush_plug(tsk)); > > if (unlikely(in_interrupt())) >-- >Michal Hocko >SUSE Labs > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>