[issue30604] co_extra_freefuncs is stored thread locally and can lead to crashes

[STINNER Victor]

STINNER Victor added the comment:

> _PyCode_SetExtra() uses two memory block for code extras. By changing how memory is accessed and allocated, it would be possible to use a single memory block. Was it on purpose to use two memory blocks?

I discussed with Yury who is not opposed to such change in Python 3.7, so I created bpo-30789.

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<http://bugs.python.org/issue30604>
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