[issue46090] C extensions can't swap out live frames anymore

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

That is weird, but can happen for example if some pthread of some c extensión for example picks up the Gil, causing a new PyThreadState to be created and linked but has not called into Python yet.

Basically, an external native thread that calls 
PyGILState_Ensure leaves a thread state with these characteristics.

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<https://bugs.python.org/issue46090>
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