In the last three days, I've had two system crashes that didn't leave
a coredump. (My system is setup properly to do this, it had done it
before, and there was enough room for it). I don't have any clue what
caused these crashes, although the machine was busy doing a build of
something in both cases.

Has anybody else seen silent crashes like this?

BTW, I last updated and built on Jan 12.