linux-kernel - Re: Segfault Error - what does this mean?

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Message-ID: <4505CF71.1070605@cfl.rr.com>
Date:	Mon, 11 Sep 2006 17:04:49 -0400
From:	Phillip Susi <psusi@....rr.com>
To:	Marc Perkel <marc@...kel.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Segfault Error - what does this mean?

A segfault means the program tried to touch a part of memory in a way 
that it is not allowed.  In this case, the address was 0, which would 
indicate that exim attempted to dereference a null pointer.  It would 
appear this is a bug in exim, not the kernel.

Marc Perkel wrote:
> Just put a new server online trying out the new AMD AM2 processor. I 
> compiled a custom kernel because the regular Fedora Core kernels aren't 
> yet compatible with my Asus M2NPV-VM motherboard using the nVidia chipset.
> 
> I compiled 2.6.18rc6 and got segfault errors. So I tried the 2.6.17.13 
> kernel and same thing. About every 20 minutes or so I get one of these.
> 
> Sep 11 12:05:18 pascal kernel: exim[19840]: segfault at 0000000000000000 
> rip 0000003f53e73ee0 rsp 00007fff9e561d18 error 4
> 
> At one point the server locked up. Before I put it online I did several 
> days of memory testing with no errors. I believe the Exim code is solid 
> as it has been running flawlessly on all my other servers.
> 
> It's probably hardware or some incompatibility but I'm not sure where to 
> start looking. Trying to understand what this error means. What is Error 
> 4? How do I track this down?
> 
> Thanks in advance.
> 

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