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SubjectRe: 3.0.1: pagevec_lookup+0x1d/0x30, SLAB issues?


On Wed, 14 Sep 2011, Eric Dumazet wrote:

> Le mercredi 14 septembre 2011 à 05:47 -0400, Justin Piszcz a écrit :
>>
>> On Wed, 14 Sep 2011, Lin Ming wrote:
>>
>>> On Mon, Sep 12, 2011 at 6:44 AM, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
>>> Hi, Justin
>>>
>>> There is a similar bug report at:
>>> http://marc.info/?t=131594190600005&r=1&w=2
>>>
>>> The attached patch from Shaohua fixed the bug.
>>>
>>> Could you have a try it?
>>>
>>
>> Hi Lin/LKML,
>>
>> Can you please provide text patch files for what you want me to apply?
>> I did read that e-mail thread and that could be the culprit, I will patch
>> and apply as soon as someone points to to the patch locations :)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 645a080..7771871 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -827,13 +827,14 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
> {
> unsigned int i;
> unsigned int ret;
> - unsigned int nr_found;
> + unsigned int nr_found, nr_skip;
>
> rcu_read_lock();
> restart:
> nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree,
> (void ***)pages, NULL, start, nr_pages);
> ret = 0;
> + nr_skip = 0;
> for (i = 0; i < nr_found; i++) {
> struct page *page;
> repeat:
> @@ -856,6 +857,7 @@ repeat:
> * here as an exceptional entry: so skip over it -
> * we only reach this from invalidate_mapping_pages().
> */
> + nr_skip++;
> continue;
> }
>
> @@ -876,7 +878,7 @@ repeat:
> * If all entries were removed before we could secure them,
> * try again, because callers stop trying once 0 is returned.
> */
> - if (unlikely(!ret && nr_found))
> + if (unlikely(!ret && nr_found > nr_skip))
> goto restart;
> rcu_read_unlock();
> return ret;
>
>

Hi,

Thanks-- patch applied and booted to the new kernel, so just so everyone knows, I am running three patches atop of 3.1-rc4:

(for the igb problem/memory allocation issue)
0001-Fix-pointer-dereference-before-call-to-pcie_bus_conf.patch
0002-PCI-Remove-MRRS-modification-from-MPS-setting-code.patch

(for the RCU/memory errors)
0003-filemap.patch

I will try to perform more load tests on the NIC and CPU/MEM/I+O and see
if any of my problems return!

Justin.
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