Kernel Dump

[Doug White]

On Sat, 6 Mar 2004, Forrest W. Christian wrote:

> I recently swapped out a motherboard in a FreeBSD server for a new Intel
> Pentium 4 motherboard/processor to gain speed.
>
> Since that time, this machine has been randomly panicing such as:
>
> Fatal trap 12: page fault while in kernel mode
> mp_lock = 00000003; cpuid = 0; lapic.id = 00000000
> fault virtual address   = 0x36

null pointer offset deref.

> fault code              = supervisor write, page not present
> instruction pointer     = 0x8:0xc01f60fe
> stack pointer           = 0x10:0xf25cdab8
> frame pointer           = 0x10:0xf25cdb58
> 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         = 454 (perl)
> interrupt mask          = net bio cam  <- SMP: XXX
> trap number             = 12
> panic: page fault
> mp_lock = 00000003; cpuid = 0; lapic.id = 00000000
> boot() called on cpu#0
>
> >From my symbol table, this particular panic appears to have occured in
> vm_fault:
>
> c01f5fcc T vm_fault
> c01f6b1c T vm_fault_wire

thats not too unsuprising. Can you follow the instructions in the handbook
to get a crashdump and use gdb to get a backtrace?

>
> This appears to be pretty consistent (the instruction pointer).  It used
> to panic both where I mentioned above and also in pmap.c.  Since I did the
> last cvsup and kernel rebuild, I haven't seen one from the pmap area.
>
> Any ideas?
>
> - Forrest W. Christian (forrestc at imach.com) AC7DE
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-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org