[issue35751] traceback.clear_frames manages to deadlock a background task

[Taras Voinarovskyi]

Taras Voinarovskyi <voyn1991 at gmail.com> added the comment:

For now, it seems like ``copy.copy(exception)`` before raising seems to prevent this behaviour. So for all exceptions originating from background tasks I raise a copy to the user, rather than the original exception. It prints correct stack, so no real impact on the library.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35751>
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