I had an interesting result doing nothing but switching from HPET to LAPIC ... no crash. Still on the same version of -current (r221566) the only thing I've done is to add kern.eventtimer.timer="LAPIC" to /boot/loader.conf, and so far I haven't been able to get it to crash no matter how much I compile, or how much other stuff I do in the background. I _can_ get the system heavily loaded enough so that the mouse can drag across the screen, windows take visible time to repaint, etc. That happens with a load average of 4+ on this core 2 duo. But other than that (which is not altogether unreasonable) the system has been very stable for a couple of days now.

Does that suggest a next step in terms of what to test?

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