Message-ID: <4514539D.8010704@cora.nwra.com>
Date: Fri, 22 Sep 2006 15:20:29 -0600
From: Orion Poplawski <orion@cora.nwra.com>
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To: Linus Torvalds <torvalds@osdl.org>
CC: linux-kernel@vger.kernel.org
Subject: Re: How to debug random bus errors?
References: <ef15fm$uhs$1@sea.gmane.org> <Pine.LNX.4.64.0609221225500.4388@g5.osdl.org>
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Linus Torvalds wrote:
> 
> On Fri, 22 Sep 2006, Orion Poplawski wrote:
>> We're seeing programs die with "bus error" (SIGBUS) randomly on a dual
>> processor Opteron machine.  I've run memtest86+ and cpuburn stress tests with
>> no failure.  gdb on a core file seems uninteresting.  Is there some way to
>> trace the kernel to try to get more insight?
> 
> Which kernel?
> 

Sorry, 2.6.17-1.2142_FC4smp, so fairly recent.

> Other than that, does it tend to happen to the same particular program? It 
> might just be a user space bug that needs a specific set of things to 
> happen. Some of those bugs go away when you disable address space 
> randomization etc, since they can depend on just pure luck (or rather, 
> lack there-of).

So far just one program.  Forgot about address space randomization, may 
need to look into turning that off to help debugging.

Thanks!

-- 
Orion Poplawski
System Administrator                  303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  orion@cora.nwra.com
Boulder, CO 80301              http://www.cora.nwra.com
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