uvmfault (7.99.1/amd64)

[Thomas Klausner <tk%giga.or.at@localhost>]

My main machine suddenly hung last night and then rebooted. There was
no big load on it at that time. dmesg contains:

uvm_fault(0xffffffff810157c0, 0xffff8003393c8000, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff80264fc5 cs 8 rflags 10202 cr2 ffff8003393c8000 
ilevel 4 rsp fffffe813d81d720
curlwp 0xfffffe813dc10aa0 pid 0.143 lowest kstack 0xfffffe813d81a2c0
panic: trap
cpu7: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
cpu7: End traceback...

dumping to dev 168,3 (offset=8, size=8373576):
dump Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
(new kernel booting messages follow)

I did get a core dump, and I do have a kernel with symbols.
# gdb netbsd
GNU gdb (GDB) 7.7.1
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and "show warranty" for details.
This GDB was configured as "x86_64--netbsd".
Type "show configuration" for configuration details.
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from netbsd...done.
(gdb) target  kvm netbsd.core
0xffffffff805b6ac5 in cpu_reboot (howto=howto@entry=260, 
bootstr=bootstr@entry=0x0) at 
/archive/foreign/src/sys/arch/amd64/amd64/machdep.c:671
671                     dumpsys();
(gdb) bt
#0  0xffffffff805b6ac5 in cpu_reboot (howto=howto@entry=260, 
bootstr=bootstr@entry=0x0) at 
/archive/foreign/src/sys/arch/amd64/amd64/machdep.c:671
#1  0xffffffff807b0ae4 in vpanic (fmt=fmt@entry=0xffffffff80c51a95 "trap", 
ap=ap@entry=0xfffffe813d81d510) at /archive/foreign/src/sys/kern/subr_prf.c:340
#2  0xffffffff807b0b9f in panic (fmt=fmt@entry=0xffffffff80c51a95 "trap") at 
/archive/foreign/src/sys/kern/subr_prf.c:256
#3  0xffffffff807fc037 in trap (frame=0xfffffe813d81d630) at 
/archive/foreign/src/sys/arch/amd64/amd64/trap.c:298
#4  0xffffffff8010108e in alltraps ()
#5  0xffffffff80264fc5 in .Mmbuf_inner_loop ()
#6  0xfffffe8692e23400 in ?? ()
#7  0xfffffe813d81d750 in ?? ()
#8  0xffffffff804c3b5e in in_delayed_cksum (m=0xffff8003393c8000) at 
/archive/foreign/src/sys/netinet/ip_output.c:791
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

This does not really look like useful information, does it?
 Thomas