One bug is that $$ doesn't get updated since the forked code isn't expected to survive long enough to be able to run any Perl code that uses $$

aha! The last bit of the puzzle. I assumed reading $$ translated into a system call to fetch the PID. It never occured to me it might not be accurate.

In reply to Re^3: Weird use warnings FATAL behavior (expected) by ikegami
in thread Weird use warnings FATAL behavior by jneil

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