In article <44AC3080.15957.784ADE@localhost>,
David Lord <david@lordynet.org> wrote:
>
>I have four pcs running NetBSD 3.0. On reboot I'm regularly seeing a 
>kernel panic from three of them, either during bootup of within a few 
>minutes later. The pc that doesn't seem to show the problem is a p4-
>2000, whilst slowest an amd586-133 is most likely to give the panic,
>maybe 1 in 3 reboots. The k6-400 has managed uptime of 41 days and 
>then had to be rebooted a couple of times to use a new kernel. I've
>seen the problem with GENERIC kernel but needed some extra options
>and took the oportunity to remove others that weren't relevant.
>
>Error is same:
>kernel: page fault trap, code=0
>Stopped at: netbsd:fr_derefrule+0x1c7: cmpl $0x2,0x88(%edx)
>
>Any ideas as to how to track this down?

You can compile the offending file adding -S -gstabs to the compile
line to produce an assembly file. Then you can objdump --disassemble
the kernel and locate the offending code. Finally locating the line
by matching the assembly instructions in the .s file should give
you the c code line number from the stabs. From there, you can look
at the c code and possibly add some debugging to help you track
the problem down.

christos