Re: 3.0rc2 oops in mem_cgroup_from_task
From: KAMEZAWA Hiroyuki <hidden>
Date: 2011-06-10 00:20:55
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Possibly related (same subject, not in this thread)
- 2011-06-12 · Re: 3.0rc2 oops in mem_cgroup_from_task · Michal Hocko <hidden>
- 2011-06-11 · Re: 3.0rc2 oops in mem_cgroup_from_task · Hugh Dickins <hughd@google.com>
- 2011-06-11 · Re: 3.0rc2 oops in mem_cgroup_from_task · Michal Hocko <hidden>
On Thu, 9 Jun 2011 16:42:09 -0700 Ying Han [off-list ref] 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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