Panic in 5.3, related to network traffic

[Robert Watson]

On Tue, 9 Nov 2004, Arjan Van Leeuwen wrote:

> I updated my server at home from a -CURRENT from june 7 to 5.3-RELEASE,
> and now I'm seeing this panic whenever someone behind this gateway
> starts emule and opens a lot of connections: 
> 
> http://www.piwebs.com/freebsd/pagefault-network.jpg
> 
> The panic doesn't occur with the -CURRENT kernel from june 7. Setting
> debug.mpsafenet=0 doesn't help. 
> 
> Does anyone have a suggestion on how to avoid this panic? 
> 
> The panic is very well reproduceable, so if you need more details,
> please tell me what to do. For now, I'll just downgrade to an older
> -CURRENT. 

Could you send a copy of your dmesg?  Could you also use gdb on a kernel
with debug symbols or addr2line to convert the function+offsets in the
trace to file and line number in the source?  This is a NULL pointer
dereference, so presumably somewhere there is a poor assumption about
memory allocation or the like.

Thanks,

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org      Principal Research Scientist, McAfee Research