>I would be really interesting to see what those tasks are blocked on. Ok, i got it! Problem occurs two times and it behaves differently each time, I was running kernel with that latest patch. 1.) It doesn't have impact on the whole server, only on one cgroup. Here are stacks: http://watchdog.sk/lkml/memcg-bug-7.tar.gz 2.) It almost takes down the server because of huge I/O on HDDs. Unfortunately, i had a bug in my script which was suppose to gather stacks (i wasn't able to do it by hand like in (1), server was almost unoperable). But I was lucky and somehow killed processes from problematic cgroup (via htop) and server was ok again EXCEPT one important thing - processes from that cgroup were still running in D state and i wasn't able to kill them for good. They were taking web server network ports so i had to reboot the server :( BUT, before that, i gathered stacks: http://watchdog.sk/lkml/memcg-bug-8.tar.gz What do you think? azur -- 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>