[Bug 235158] lang/lua53 no longer linked against pthread

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235158

--- Comment #18 from i+fbsd at amlegion.org ---
(In reply to andrew from comment #16)
https://builds.amlegion.org/freebsd_test/dynthr_ktrace.txt
That is the ktrace as per the method specified when we did the lua ktrace.

This does not exactly hang the same as the lua test case, but that's because it
doesn't mask all signals like cqueues does when creating a thread (if I
remember correctly). I do know that cqueues did have the signals masked and
that's why it hung and a kill -9 was required and even a CTRL+C (SIGTERM)
didn't kill it.

The failure exhibited itself with no changes to the code whatsoever, the
SIGALARM takes the place of having to CTRL+C and with no signals masked
although the thread is hung, one can still get this to exit. No messages about
thrashing ever displayed whatosever, and it should have either from the main
thread or child thread.

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