[issue5614] Malloc errors in test_io

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

>malloc: *** mmap(size=-9223372036854775808) failed

Does this error occur even if you revert Modules/mmapmodule.c to ｒ69214?
I have touched this module recently (I believe I fixed only SEGV bugs,
not changed behavior) so I want to know it.

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nosy: +ocean-city

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