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Resizing an anonymous mmap can lead to crash #138204

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Resizing an anonymous mmap can lead to crash#138204
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serhiy-storchaka
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3.13bugs and security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-crashA hard crash of the interpreter, possibly with a core dump

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@serhiy-storchaka
serhiy-storchaka
opened on Aug 27, 2025

Crash report

>>> import mmap
>>> m = mmap.mmap(-1, mmap.PAGESIZE)
>>> m.resize(2 * mmap.PAGESIZE)
>>> m[:]
Bus error (core dumped)

Tested on Linux.

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3.13bugs and security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-crashA hard crash of the interpreter, possibly with a core dump

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