linux-kernel - Re: oops in __bounce_end_io

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Message-ID: <20090101210831.GA20419@lst.de>
Date:	Thu, 1 Jan 2009 22:08:31 +0100
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: oops in __bounce_end_io_read under kvm

On Sun, Dec 28, 2008 at 07:25:00PM +0100, Jens Axboe wrote:
> On Sun, Dec 28 2008, Christoph Hellwig wrote:
> > On Sun, Dec 28, 2008 at 07:10:59PM +0100, Jens Axboe wrote:
> > > Is this -rc9 stock + xfs patches, or does it include -mm or -next
> > > patches (or the block patches)?
> > 
> > Just -rc9 and xfs updates.  The only change outside of fs/xfs/ is a new
> > define in fs.h and a couple new helpers in inode.c
> 
> OK, then it's surely a new bug. Could you do a gdb l *0xbla on that
> address to check where it's faulting?

It took a while to reproduce it again, but I got it again today.


(gdb) l *0xc01a5444
0xc01a5444 is in __bounce_end_io_read
(/home/hch/work/xfs/arch/x86/include/asm/string_32.h:35).
30	extern size_t strlen(const char *s);
31	
32	static __always_inline void *__memcpy(void *to, const void *from, size_t n)
33	{
34		int d0, d1, d2;
35		asm volatile("rep ; movsl\n\t"
36			     "movl %4,%%ecx\n\t"
37			     "andl $3,%%ecx\n\t"
38			     "jz 1f\n\t"
39			     "rep ; movsb\n\t"

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