On Wed, Nov 2, 2011 at 5:06 AM, Hillf Danton <dhillf@xxxxxxxxx> wrote:
> On Wed, Nov 2, 2011 at 6:20 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>> The line that crashed is BUG_ON(page_count(old_page) != 1) in hugetlb_cow.
>>
>
> Hello Andy
>
> Would you please try the following patch?
>
> Thanks
> Hillf
>
>
> --- a/mm/hugetlb.c Sat Aug 13 11:45:14 2011
> +++ b/mm/hugetlb.c Wed Nov 2 20:12:00 2011
> @@ -2422,6 +2422,8 @@ retry_avoidcopy:
> * anon_vma prepared.
> */
> if (unlikely(anon_vma_prepare(vma))) {
> + page_cache_release(new_page);
> + page_cache_release(old_page);
> /* Caller expects lock to be held */
> spin_lock(&mm->page_table_lock);
> return VM_FAULT_OOM;
>
I'll patch it in. My test case took over a week to hit it once, so I
can't guarantee I'll spot it.
--Andy
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