ARM64 hosts eventually lockup running net-mgmt/unifi

[Josh Howard]

This one has been sort of a pain to narrow down, but on any of: RockPro64,
RockPi4b, or RPI4, if I run net-mgmt/unifi eventually the host just hard
locks. Nothing over serial, nothing interesting in the logs, no other hints,
so it's not clear what precisely is causing it. For those unfamiliar, unifi
runs both a Java app and a mongodb server. I've tried with openjdk8 (their
only supports version) and openjdk11, neither one made any difference. I'm
not totally sure how a userland app like this could cause this to happen,
but it's getting consistent that it eventually does kill my host.

Any ideas or hints would be great!