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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 fixes3.15new features, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-crashA hard crash of the interpreter, possibly with a core dump

@serhiy-storchaka

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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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serhiy-storchaka

Labels

3.13bugs and security fixes3.14bugs and security fixes3.15new features, 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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