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From: Dave Chinner <david@fromorbit.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>, xfs@oss.sgi.com
Subject: Re: reproducible xfs/vmap oops
Date: Wed, 4 Feb 2009 08:42:45 +1100	[thread overview]
Message-ID: <20090203214245.GJ24173@disturbed> (raw)
In-Reply-To: <20090203210423.GA26628@infradead.org>

On Tue, Feb 03, 2009 at 04:04:23PM -0500, Christoph Hellwig wrote:
> [ 3138.799436] XFS mounting filesystem vde
> [ 3138.813184] va->va_start = 4290777088, va->va_end = 4096
> [ 3138.834754] tmp->va_start = 4195352576, tmp->va_end = 4196401152
> [ 3138.846352] ------------[ cut here ]------------
> [ 3138.850332] kernel BUG at mm/vmalloc.c:298!
> [ 3138.850332] invalid opcode: 0000 [#1] SMP 
> 
> The first va_end looks suspicious to me..

That is on i386, Christoph? If so, I'd suspect a 32 bit overflow
as 4290777088 = 0xFFC01000 and va_start/va_end are unsigned longs.
If we tried to map exactly 4MB the with va_start at 0xFFC01000 we'd
end up with va_end at 0x100001000 which would wrap to 0x1000 = 4096.

Nick - this one is probably yours ;)

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2009-02-03 21:46 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-01  8:12 reproducible xfs/vmap oops Christoph Hellwig
2009-02-01 16:14 ` Christoph Hellwig
2009-02-03 15:51   ` Christoph Hellwig
     [not found]     ` <200902040303.13933.nickpiggin@yahoo.com.au>
2009-02-03 16:05       ` Christoph Hellwig
2009-02-03 18:44         ` Christoph Hellwig
2009-02-03 21:04           ` Christoph Hellwig
2009-02-03 21:42             ` Dave Chinner [this message]
2009-02-03 21:47               ` Christoph Hellwig
2009-02-03 22:08                 ` Christoph Hellwig
     [not found]                   ` <200902041648.55603.nickpiggin@yahoo.com.au>
2009-02-04  8:15                     ` Christoph Hellwig
2009-02-04  8:30                       ` Christoph Hellwig
     [not found]                         ` <200902042027.40762.nickpiggin@yahoo.com.au>
2009-02-04 19:38                           ` Christoph Hellwig
     [not found]                             ` <200902101543.15988.nickpiggin@yahoo.com.au>
2009-02-10  7:54                               ` Christoph Hellwig
2009-02-15 19:15                                 ` Christoph Hellwig

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