FreeBSD -STABLE servers repeatedly crashing.

Kris Kennaway kris at
Wed Jun 29 10:05:38 GMT 2005

On Tue, Jun 28, 2005 at 11:26:06AM -0400, Matt Juszczak wrote:

> >OK, when it crashes next and is sat at the "db>" prompt, type "tr" and
> >press enter to get a trace.  Copy this down (or have a serial console to
> >capture the output).  Also, try typing "call doadump()" and see if that
> >succeeds in generating a crash dump.  How were you trying to generate
> >one before?
> >
> >Gavin
> > 
> >
> I can't type anything.  The machine locks up.
> See:
> After CPUID: 1, the machine locks cold and nothing else is printed to 
> the screen.

Try two things:

1) adding 'options KDB_STOP_NMI' to your kernel config.

2) If you still can't get it to break to DDB, then compile up a
debugging kernel, run kgdb on it (as described in the developers'
handbook), and list *(0xblah) where that address is the value of the
instruction pointer in the trap message (e.g. 0xc6644eff in your paste
above).  That might at least be a start.

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