FreeBSD 9.2 crash under load

[Tom Everett]

I'm experiencing a fairly repeatable crash under load.  Most recently the
crash under load was during numerous rsync jobs, at the same time as
cross-compiling NetBSD in a jail. I have the crash log from dmesg (below).
 What do people typically do in situations like to, to determine if the
problem is due to overheating, bad hardware, a kernel bug, bad RAM, etc?

Fatal trap 12: page fault while in kernel mode
> cpuid = 1; apic id = 01
> fault virtual address = 0xc
> fault code = supervisor read data, page not present
> instruction pointer = 0x20:0xffffffff80b7442d
> stack pointer         = 0x28:0xffffff846d11a780
> frame pointer         = 0x28:0xffffff846d11a7c0
> 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 = 55420 (rsync)
> trap number = 12
> panic: page fault
> cpuid = 1
> KDB: stack backtrace:
> #0 0xffffffff80947986 at kdb_backtrace+0x66
> #1 0xffffffff8090d9ae at panic+0x1ce
> #2 0xffffffff80cf20d0 at trap_fatal+0x290
> #3 0xffffffff80cf2431 at trap_pfault+0x211
> #4 0xffffffff80cf29e4 at trap+0x344
> #5 0xffffffff80cdbd13 at calltrap+0x8
> #6 0xffffffff80b7473e at zone_fetch_slab+0x3e
> #7 0xffffffff80b75b8d at uma_zalloc_arg+0x31d
> #8 0xffffffff80959f84 at selfdalloc+0x64
> #9 0xffffffff8095bf34 at kern_select+0x594
> #10 0xffffffff8095c32d at sys_select+0x5d
> #11 0xffffffff80cf187a at amd64_syscall+0x5ea





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