kernel panic and corrupt vmcore

[Steve Kargl]

Installed a kernel based on yesterday's src/ tree.
The kernel panicked and the generated core seems 
to be corrupt.  Is there a known issue with getting
core dumps on x86_64 freebsd?  The top of the
core.txt.0 file shows 

troutmask.apl.washington.edu dumped core - see /usr/tmp/vmcore.0

Fri Aug 27 11:26:26 PDT 2010

FreeBSD troutmask.apl.washington.edu 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r211766M: Tue Aug 24 14:52:25 PDT 2010     kargl at troutmask.apl.washington.edu:/usr/obj/usr/src/sys/SPEW  amd64

panic: page fault

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 "amd64-marcel-freebsd"...
Cannot access memory at address 0xffffff01ffffffe0
(kgdb) #0  0x0000000000000000 in ?? ()
Cannot access memory at address 0x0
(kgdb) 

If anyone wants the entire content of core.txt.0, simply 
request it.

My was doing the following when the panic occurred:

1) Running rsync via cron to back up /usr/home accounts from
   /dev/ad6s1f to /dev/ad4s1f.  Both file systems use 
   softupdates+journaling.

2) Building ports/www/firefox (which is version 3.6.8)

3) Running the GCC dejagnu testsuite for the gfortran compiler

4) Using firefox-3.5.11 to view a site that drives the Xorg 
   srever to 90% CPU usage.



-- 
Steve