linux-ext4 - Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff

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Date:	Fri, 25 Apr 2008 02:57:24 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	paulmck@...ux.vnet.ibm.com, David Miller <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org, herbert@...dor.apana.org.au,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <clameter@....com>
Subject: Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff

On 04/25/2008 12:41 AM, Linus Torvalds wrote:
> 
> On Fri, 25 Apr 2008, Jiri Slaby wrote:
>> 20 arpings running on wlan0 (don't know if this is related so far), suspend,
>> resume, right after resume:
>>
>> freed 114
>> alloced 115
>> freed 115
>> alloced 116
>> WHAT THE HELL (000a3ff8):
>> ff00aa00deadcc22 ff00aa00deadcc22 ff00aa00deadcc22 ff00aa00deadcc22
> 
> Very interesting indeed.
> 
>> Shouldn't be 2.6.25 uttered as broken until this is solved to not corrupt
>> anyone's data? I'm going to play with that testing program further in the
>> meantime.
> 
> Do you actually see this with _plain_ 2.6.25? So far I've assumed that all 
> the reports are about post-2.6.25 issues.

Blah, sorry, I lived in a theory, that Rafael got one from 2.6.25 and no, 
really, he had -git2 applied. Mea culpa, anyway I'll test 2.6.25 too, just for sure.

> Also, it does seem like you can re-create this at will in ways that others 
> can not. Could you try to bisect it a bit? Right now we have no real clue 
> what it is all about, except that it seems to be related to suspend/resume 
> and there are some indications that it's about networking (and _perhaps_ 
> wireless in particular).

Not really. I have no idea what triggers it. Seems like suspend is some kind of 
catalyzer not working every time. I can't get it to crash for 1 whole day. 
Probably with the program (I hacked it a hour ago or so) it would be easier to 
reveal the error far before the crash itself. Will keep you informed. Now going 
to catch some sleep.
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