sometimes resumeable freeze

["Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>]

Hi,

My quad core AMD box has an issue where it will lock up under load.

Often, when the machine is otherwise unresponsive, I'll press
Num Lock on the pckbd(4) and it will awaken at the point in time
it went comatose.  Eventually, pressing num lock doesn't bring it
back and I have to force a reboot.

If I `cpuctl offline` ¾ of the CPUs the machine is acceptably stable.
The machine is also acceptably stable under Linux with all cores
enabled and performing a similar workload (build.sh release).

acpicpu(4) is present in the kernel and I have verified that C1E
is not enabled.  The machine was significantly less stable when
C1E was enabled.

I've tried to wire in a Conventional PCI SERR# trigger, but
the chipset doesn't propagate that into an NMI and I lack
details on the chipset required to enable that if possible.

Can anyone think of ways to debug this issue?

        Jonathan Kollasch