Serhiy Storchaka added the comment:

Looks as globals in setup_context() is NULL. I suppose it is 
PyThreadState_Get()->interp->sysdict. interp->sysdict is cleared in 
PyInterpreterState_Clear(). Other code is executed after setting 
interp->sysdict to NULL (clearing interp->sysdict content, interp->builtins, 
interp->builtins_copy and interp->importlib) and this potentially can emit 
warnings.

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nosy: +pitrou, serhiy.storchaka

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<http://bugs.python.org/issue22898>
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