Stress tests stuck - what should I look at?

[Jim Apple]

I'm running the EE tests on a machine and it seems to be stuck in the
stress tests. I have access to the machine for now, but my Jenkins
install is going to steal it from me when the job is force-timed-out
in a few hours. What should I look at now to try and understand what
is happening - in particular, what could be useful to me now but not
visible in the logs?