linux-kernel - Re: [Bug #14141] order 2 page allocation failures in iwlagn

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Date:	Fri, 16 Oct 2009 22:42:23 -0700
From:	reinette chatre <reinette.chatre@...el.com>
To:	Frans Pop <elendil@...net.nl>
Cc:	Mel Gorman <mel@....ul.ie>, David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	"Abbas, Mohamed" <mohamed.abbas@...el.com>,
	"John W. Linville" <linville@...driver.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn

Hi Frans,

On Thu, 2009-10-15 at 12:41 -0700, Frans Pop wrote:
> On Thursday 15 October 2009, reinette chatre wrote:
> > > The log file timestamps don't tell much as the logging gets delayed,
> > > so they all end up at the same time. Maybe I should enable the kernel
> > > timestamps so we can see how far apart these failures are.
> >
> > If you can get accurate timing it will be very useful. I am interested
> > to see how quickly it goes from "48 free buffers" to "0 free buffers".
> 
> Attached the dmesg for three consecutive test runs (i.e. without 
> rebooting). Not that the 2nd one includes only "0 free buffers" messages, 
> even though the behavior (point where desktop freezes and music stops) 
> looked similar.
> 
> Not sure if you can tell all that much from the data.
> 

Prompted by this thread we are in process of moving allocation to paged
skb. This will definitely reduce the allocation size (from order 2 to
order 1) and hopefully help with this problem also. Could you please try
with the attached two patches? They are based on 2.6.32-rc4.

Thank you very much

Reinette






View attachment "0001-iwlwifi-use-paged-Rx.patch" of type "text/x-patch" (50735 bytes)

View attachment "0002-iwlwifi-fix-use-after-free-bug-for-paged-rx.patch" of type "text/x-patch" (8709 bytes)