Any way to debug a hard lockup?

Joe Marcus Clarke marcus at
Wed Jul 7 12:18:36 PDT 2004

On Wed, 2004-07-07 at 15:03, Conrad J. Sabatier wrote:
> For the last few days, my amd64 box (Athlon 64 3200+, 5.2-CURRENT,
> updating just about daily lately) has been locking up hard fairly
> often, and I have no clue as to why.
> Checking the logs after rebooting reveals nothing at all out of the
> ordinary.  The box just "seizes up" and that's that.  Only thing to do
> is a power-down and restart.
> Changing from SCHED_ULE to SCHED_4BSD appears to make no difference at
> all.
> My other box, an older (32-bit) Athlon, has been rock stable.  I've
> been keeping both machines updated simultaneously to exactly the same
> revisions, using as near-identical system settings as possible also,
> the main difference being I'm running on the amd64 box and
> no X on the i386 box.
> Any suggestions?  Instinct tells me it may be a problem with some of
> the ports I'm running (, hence the Cc:s), but how to verify?
> Sure, I could run without X a while and see how it goes, but that still
> won't help to isolate the problem, if it is, in fact, port-related.

You'll need to use a serial console and DDB to debug these problems. 
See on setting that up.  Once the machine breaks into the debugger, you'll be able to get a stack trace.


> Thanks.
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