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

Marius Strobl marius at alchemy.franken.de
Sun Nov 9 10:20:19 PST 2008

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.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain 
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> 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.


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