named resolver hung on shutdown at the end of a respdiff test
https://gitlab.isc.org/isc-projects/bind9/-/jobs/2876953
Looks like all the threads were idle (i.e. waiting for some event that would never happen):
(I did not bother with bt full
as I do not think it would help. I
preserved the core dump, though.)
If this happened to a resolver configured for a respdiff test, it probably means it can happen to any resolver out there.