linux-kernel - Re: [Bug 18252] spinlock lockup in __make_request <- submit_bio <- ondemand

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Date:	Tue, 14 Sep 2010 08:56:43 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Florian Mickler <florian@...kler.org>
CC:	linux-kernel@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	axboe@...nel.dk, linux-scsi@...r.kernel.org
Subject: Re: [Bug 18252] spinlock lockup in __make_request <- submit_bio <-
 ondemand_readahead

Andrew Morton wrote:
>>> https://bugzilla.kernel.org/show_bug.cgi?id=18252
...
> What you've quoted above appears to be just the aftermath. 
> https://bugzilla.kernel.org/attachment.cgi?id=29562 indicates that the
> kernel earlier crashed in scsi code, perhaps under
> scsi_setup_fs_cmnd().
> 
> The question is: was that actually the first crash, or did an even
> earlier one scroll off?

It happened overnight.  The screenshot
https://bugzilla.kernel.org/attachment.cgi?id=29562 shows that there was a lot
more logged before it.  When I saw it in the morning I assumed that the tail
was a repetition of the leading bug trace, but it seems I am mistaken.

Florian Mickler wrote:
> There was an scsi-related use-after-free OOPS fixed recently and pulled 3 days
> ago.  
> 
> On Sat, 11 Sep 2010 19:07:44 +0000
> James Bottomley <James.Bottomley@...e.de> wrote:
> 
>> This includes the oops from use after free, a set of qla2xxx fixes, some
>> misc warning cleanups from the recently introduced printk issue, an hpsa
>> lockup fix and a medium removal bug in sd introduced by the BKL
>> pushdown.
>> 
>> The patch is available here:
>> 
>> master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6.git
> 
> Maybe you are seeing that?
> 
> (reacting to the general-protection-fault preceded by scsi_init in the
> attachment jpg)

Now that you point it out --- perhaps.  Though I haven't looked into the
mechanics of the now fixed scsi_ini_io use after free.

I am going to update to 2.6.36-rc4 today (I had reverted to 2.6.35 since the
report), and if the issue does not return after two weeks or so I will close
it as fixed, I suggest.
-- 
Stefan Richter
-=====-==-=- =--= -===-
http://arcgraph.de/sr/
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