Re: 3.0rc2 oops in mem_cgroup_from_task

[KAMEZAWA Hiroyuki]

On Thu, 9 Jun 2011 16:42:09 -0700
Ying Han <yinghan@xxxxxxxxxx> 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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