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Date: Mon, 14 Oct 2002 13:49:29 -0700
From: Andrew Morton <akpm@digeo.com>
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To: David Mansfield <lkml@dm.cobite.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: [BUG] raw over raid5: BUG at drivers/block/ll_rw_blk.c:1967
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David Mansfield wrote:
> 
> Hi everyone,
> 
> I haven't been able to run raw over raid5 since 2.5.30 or so, but every
> time I'm about to report it, a new kernel comes out and the problem
> changes completely :-( Now I'm finally going to start getting out the info
> it the hopes someone can fix it.  The oops was triggered by attempting to
> read from /dev/raw/raw1 (bound to /dev/md0) using dd.  System info
> follows oops:
> 
> ------------[ cut here ]------------
> kernel BUG at drivers/block/ll_rw_blk.c:1967!

I don't think you told us the kernel version?

There have been recent fixes wrt sizing of the BIOs which the
direct-io layer sends down.  So please make sure that you're
testing Linus's current -bk, or 2.5.42 plus

http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.42/2.5.42-mm2/broken-out/dio-bio-add-fix-1.patch

Either that, or raid5 is bust ;)
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