FreeBSD 7.2: Page fault while in kernel mode

Hi,

I have a problem with one of my servers running
Code:
FreeBSD encephalon.de 7.2-RELEASE-p3 FreeBSD 7.2-RELEASE-p3 #4: Mon Aug  3 10:51:13 CEST 2009     asg@encephalon.de:/usr/obj/usr/src/sys/GRUNIX  amd64

2GB of RAM
gmirror

I started to copy a jail via cpdup and afterward bzip2 the copy.
While this was running, the system did a spontaneus reboot.

Code:
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0xfffffffe80a52ff8
fault code              = supervisor read data, page not present
instruction pointer     = 0x8:0xffffffff805330b7
stack pointer           = 0x10:0xfffffffebec6ba30
frame pointer           = 0x10:0xfffffffe807232c0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 63464 (postgres)
trap number             = 12
panic: page fault
cpuid = 1
Uptime: 16h7m0s
Physical memory: 2003 MB
Dumping 468 MB: 453 437 421 405 389 373 357 341 325 309 293 277 261 245 229 213 197 181 165 149 133 117 101 85 69 53 37 21 5

Does anyone know what could be the problem?
In the past the server had also some spontaneus reboots without doing the described job.

I have a couple of jails running on that system (with separate postgres running in two jails).



Thanks in advance.

Cheers,

Axel
 
The server might have faulty memory, you may want to check that.
 
Well, i run memtest a couple of times, seems to be fine.
I do not have physical access to the machine, so I can not try some other ram modules... :-(
 
Does bzip2 handle the special file flags in your jail tree correctly? I assume the jail contains a FreeBSD system tree.
It can be anything, this is just a guess.

chflags -R noschg <dir> #removes all flags in <dir>.

If the reboot happens at random moments it,s probably a hardware problem.
 
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