[issue35368] [2.7] Make PyMem_Malloc() thread-safe in debug mode

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

According to bpo-31473, the debug hook on PyMem_Malloc() is not thread-safe: 'serialno' variable is not protected by any lock and it's not atomic.

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<https://bugs.python.org/issue35368>
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