[issue1733757] RuntimeWarning: tp_compare didn't return -1 or -2

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The "funny" errors around trace & exceptions have been corrected with
issue1265.

The remaining problem is a livelock: when the interpreter exits, 
threading.Thread.__delete is called, and this calls
"_active_limbo_lock.acquire".

But the sys.settrace is still enabled... and threading.currentThread()
can also call "_active_limbo_lock.acquire" when the main thread cannot
be found...

A solution could be to clear sys.settrace when closing the interpreter.

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nosy: +amaury.forgeotdarc

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