Re: [ZMailer] Zmailer crashes

[Matti Aarnio <mea@nic.funet.fi>]

On Fri, Jan 30, 2009 at 03:32:31PM -0800, Neal Morgan wrote:
> > On October 31, 2008 9:03 AM Ralf Baechle wrote
> > Since quite a while I'm observing these kernel messages on a Linux x86_64
> > system:
> >
> > sm[3270]: segfault at 3ba7f9f0 ip 79fbc9 sp 7fffe7c48e30 error 6 in
> libc-2.7.so[72d000+14d000]
> > sm[3493] trap stack segment ip:7f0e2a121bc9 sp:7fff3240e4a0 error:0
> > sm[3773]: segfault at 3ba7f9f0 ip 79fbc9 sp 7fff55499680 error 6 in
> libc-2.7.so[72d000+14d000]
> 
> Matti: I've been seeing these across 4 servers:
> 
> kernel: smtpserver[31693]: segfault at 00000000 eip b7c16371 esp
> bf94b018 error 4
> 
> kernel: router[9934]: segfault at 00000008 eip 0807fa95 esp bfdf5570
> error 4
> 
> The interesting thing is it only happens when booted into a 2.6.24
> kernel.  If I reboot the same box into a 2.6.18 kernel everything runs
> fine (and there are no segfaults).

I do see them too with 2.6.26 kernel at zmailer.org server.
A few hits per week according to kernel dmesg logs.

I suspect more about glibc doing something stupid, than program really
going over the edge, but these are so rare that debugging them is next
to impossible.   Previously I have seen them happen after the program
has called exit(0).

Anyway I have turned on core dumps to be able to see what happens.


-- 
/Matti Aarnio	<mea@nic.funet.fi>
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