bpvo pool exhausted

From: Cameron Berkenpas <cam_at_neo-zeon.de>
Date: Tue, 27 Sep 2022 17:40:52 UTC
Hello,

When recompiling my ports, I started getting periodic crashes on a VM 
running on POWER9.

"bpvo pool exhausted".

The message says to try setting machdep.moea64_allocated_bpvo_entries, 
but this is apparently read-only. I've attached a screenshot of the 
stacktrace.