Occasional kernel panic + reboot on 7.0-RELEASE with fatm driver.

[Marius Strobl]

On Thu, Nov 06, 2008 at 01:17:17PM -0500, Sean Thomas Caron wrote:
> Hi folks,
> 
> I'm using fatm on FreeBSD/sparc64 7.0-RELEASE; it generally works well  
> but every couple of weeks the system will kernel panic and reboot. I  
> switched on kernel dumps on panic and here's what I got (this time):
> 
> sonnet.diablonet.net> kgdb kernel.debug /var/crash/vmcore.0
> kgdb: kvm_nlist(_stopped_cpus):
> kgdb: kvm_nlist(_stoppcbs):
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
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> This GDB was configured as "sparc64-marcel-freebsd".
> 
> Unread portion of the kernel message buffer:
> panic: trap: fast data access mmu miss

<...>

This apparently is a NULL-pointer dereference (probably "m"
in sbsndptr()), with the cause being in one of the stacks
involved. I'd suggest to report this backtrace to the atm@
and net@ lists.

Marius