RELENG 6.1/AMD64 system hangs when SMP enabled

[Kris Kennaway]

On Fri, Oct 27, 2006 at 09:35:09AM +0200, bram wrote:
> Hi all,
> 
> I'm rather new to freebsd so forgive me if I am saying things that don't 
> make sense.
> 
> I have a dual opteron server running freebsd 6.1/amd64 updated 4 weeks ago.
> 
> Since I moved to 6 I've been having tho following problem.
> 
> When I put heavy load on the server (python scripts that take 20 minutes 
> to complete) the server sometimes hangs.
> 
> I can then not ping it anymore and it does not respond to anything (no 
> keyboard power button etc.).
> Mostly there are no error messages or anything so I have no clue to what 
> the problem is.
> One time it did give an error but I did not wrote it down, but as I 
> recall it was something like SMP spin lock timed out.
> 
> It hangs every three weeks
> 
> Please give me some info on how I can get it to give more info or how to 
> resolve this problem.

See the chapter on kernel debugging in the develpers handbook

Kris
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