linux-kernel - Re: 2.6.20.3: kernel BUG at mm/slab.c:597 try#2

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Date:	Tue, 20 Mar 2007 00:25:02 +0100
From:	Andreas Steinmetz <ast@...dv.de>
To:	Mike Christie <michaelc@...wisc.edu>
CC:	James Bottomley <James.Bottomley@...elEye.com>,
	Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: 2.6.20.3: kernel BUG at mm/slab.c:597 try#2

Mike Christie wrote:
> Mike Christie wrote:
>> James Bottomley wrote:
>>> On Mon, 2007-03-19 at 12:49 -0500, Mike Christie wrote:
>>>>> I can't even say if the tapes are written correctly as I can't read them
>>>>> (one does not reboot production machines back to 2.4.x just to try to
>>>>> read a backup tape - I don't have 2.6.x older than 2.6.20 on these
>>>>> machines).
>>>> Could you try this patch
>>>> http://marc.info/?l=linux-scsi&m=116464965414878&w=2
>>>> I thought st was modified to not send offsets in the last elements but
>>>> it looks like it wasn't.
>>> Actually, there are two patches in the email referred to.  If the
>>> analysis that we're passing NULL to mempool_free is correct, it should
>>> be the second one that fixes the problem (the one that checks
>>> bio->bi_io_vec before freeing it).  Which would mean we have a
>>> nr_vecs==0 bio generated by the tar somehow.
>>>
>> I think we might only need the first patch if the problem is similar to
>> what the lsi guys were seeing. I thought the problem is that we are not
>> estimating how large the transfer is correctly because we do not take
>> into account offsets at the end. This results in nr_vecs being zero when
>> it should be a valid value. I thought Kai's patch:
>> http://bugzilla.kernel.org/show_bug.cgi?id=7919
>> http://git.kernel.org/?p=linux/kernel/git/jejb/scsi-misc-2.6.git;a=commitdiff;h=9abe16c670bd3d4ab5519257514f9f291383d104
>> fixed the problem on st's side,
> 
> Oh, I noticed that the subject for the mail references 2.6.30.3 and the
> patch for st in the bugzilla did not make into 2.6.20 and is not in .3.
> Could we try the st patch in the bugzilla first?

Ok, the st patch from bugzilla solves the problem (tested on both
affected machines).
-- 
Andreas Steinmetz                       SPAMmers use robotrap@...dv.de
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