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Message-Id: <20130624184840.781777E6@pobox.sk>
Date:	Mon, 24 Jun 2013 18:48:40 +0200
From:	"azurIt" <azurit@...ox.sk>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	cgroups mailinglist <cgroups@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH for 3.2] memcg: do not trap chargers with full callstack on OOM

>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
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