linux-kernel - Re: 3.0rc2 oops in mem_cgroup_from

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Message-Id: <20110610091355.2ce38798.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 10 Jun 2011 09:13:55 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Ying Han <yinghan@...gle.com>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: 3.0rc2 oops in mem_cgroup_from_task

On Thu, 9 Jun 2011 16:42:09 -0700
Ying Han <yinghan@...gle.com> wrote:

> ++cc Hugh who might have seen similar crashes on his machine.
> 

Thank you for forwarding. Hmm. It seems the panic happens at khugepaged's 
page collapse_huge_page().

==
        count_vm_event(THP_COLLAPSE_ALLOC);
        if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
==
It passes target mm to memcg and memcg gets a cgroup by
==
 mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
==
Panic here means....mm->owner's task_subsys_state contains bad pointer ?

I'll dig. Thanks.
-Kame

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