Re: How to debug random bus errors?

[Orion Poplawski]

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@xxxxxxxxxxxxx
Boulder, CO 80301              http://www.cora.nwra.com
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