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Date: Mon, 23 Sep 2002 15:05:59 -0700
From: Andrew Morton <akpm@digeo.com>
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To: Paul Larson <plars@linuxtestproject.org>,
       Badari Pulavarty <pbadari@us.ibm.com>
CC: lkml <linux-kernel@vger.kernel.org>, lse-tech@lists.sourceforge.net
Subject: Re: Bug in last night's bk test
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Paul Larson wrote:
> 
> The automated nightly testing turned up a bug on one of the test
> machines last night.  The system that had the problem was running ltp
> and was a 2-way PII-550, 2GB ram, ext2.  Here is the ksymoops dump:
> 
> ksymoops 2.4.5 on i686 2.4.18.  Options used
>      -V (default)
>      -K (specified)
>      -L (specified)
>      -O (specified)
>      -m System.map (specified)
> 
> kernel BUG at ll_rw_blk.c:1802!

Ah, yes.

The direct-io code will build requests which are larger than
the ips driver is prepared to accept, and the BIO layer correctly
BUGs out over it.

We need to convert direct-io to use the bio_add_page() facility
which Jens has recently added.

Until that's done you'll need to set BIO_MAX_PAGES to 16 in
include/linux/bio.h