On 06/02/2011 01:10 AM, Hiroyuki Kamezawa wrote:
>> pc = list_entry(list->prev, struct page_cgroup, lru);
> Hmm, I disagree your patch is a fix for mainline. At least, a cgroup
> before completion of
> create() is not populated to userland and you never be able to rmdir()
> it because you can't
> find it.
>
>
> >26: e8 7d 12 30 00 call 0x3012a8
> >2b:* 8b 73 08 mov 0x8(%ebx),%esi<-- trapping
> instruction
> >2e: 8b 7c 24 24 mov 0x24(%esp),%edi
> >32: 8b 07 mov (%edi),%eax
>
> Hm, what is the call 0x3012a8 ?
>
pc = list_entry(list->prev, struct page_cgroup, lru);
if (busy == pc) {
list_move(&pc->lru, list);
busy = 0;
spin_unlock_irqrestore(&zone->lru_lock, flags);
continue;
}
spin_unlock_irqrestore(&zone->lru_lock, flags); <----
is call 0x3012a8
ret = mem_cgroup_move_parent(pc, mem, GFP_KERNEL);
and mov 0x8(%ebx),%esi
is dereferencing of 'pc' in inlined mem_cgroup_move_parent
I've looked at vmcore once more and indeed there isn't any parallel task
that touches cgroups code path.
Will investigate if it is xen to blame for incorrect data in place.
Thanks very much for your opinion.
> Thanks,
> -Kame
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