Odd hang behavior; hard to replicate

[Vaguery]

I've been running some very long, sort of large runs on a desktop machine. In several runs the search has gotten a few generations, and then hung. No error, no crash, just "Processing generation: X" for 20+ hours, for random X.

When I glance at Activity Monitor, there are no Java processes running. Is it possible for the JVM to crash without an error message? If so... ¯\_(ツ)_/¯