7.0 kernel crash: page fault while in kernel mode

[Toni Schmidbauer]

hi,

i'm running 

FreeBSD murus 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Mon Mar 3 20:53:07
CET 2008 root at murus:/usr/obj/usr/src/sys/GENERIC i386

today this machine crashed, but lucky me i did get a crash dump. i'm
not a kernel developer so any help would be great in finding out the
reason for the crash.

the machine is running as a firewall with various services (imap,
smtp,dns ...). i'm also using if_bridge/vlans to filter traffic for
internal clients.

thanks for your time

toni

========================================
root at murus /usr/obj/usr/src/sys/GENERIC {1027}# kgdb kernel.debug /var/crash/vmcore.0
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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 "i386-marcel-freebsd".

Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xbc
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc078075e
stack pointer           = 0x28:0xe5550ab4
frame pointer           = 0x28:0xe5550ac4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 950 (apcupsd)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 48d14h37m48s
Physical memory: 946 MB
Dumping 202 MB: 187 171 155 139 123 107 91 75 59 43 27 11

#0  doadump () at pcpu.h:195
195             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt
#0  doadump () at pcpu.h:195
#1  0xc0754457 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0754719 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc0a4905c in trap_fatal (frame=0xe5550a74, eva=188) at /usr/src/sys/i386/i386/trap.c:899
#4  0xc0a492e0 in trap_pfault (frame=0xe5550a74, usermode=0, eva=188) at /usr/src/sys/i386/i386/trap.c:812
#5  0xc0a49c8c in trap (frame=0xe5550a74) at /usr/src/sys/i386/i386/trap.c:490
#6  0xc0a2fc0b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc078075e in rman_reserve_resource_bound (rm=0x0, start=0, end=3232598804, count=753, bound=0, flags=590486, dev=0xe5550b2c)
    at /usr/src/sys/kern/subr_rman.c:325
#8  0xc0788b72 in kern_select (td=0xc437a420, nd=5, fd_in=0xbfbfecc0, fd_ou=0x0, fd_ex=0x0, tvp=0xe5550c70)
    at /usr/src/sys/kern/sys_generic.c:845
#9  0xc07890de in select (td=0xc437a420, uap=0xe5550cfc) at /usr/src/sys/kern/sys_generic.c:663
#10 0xc0a49635 in syscall (frame=0xe5550d38) at /usr/src/sys/i386/i386/trap.c:1035
#11 0xc0a2fc70 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:196
#12 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)
========================================