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SIGSEV with method descriptors called without a second argument #132747

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@Changaco

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@Changaco
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Crash report

What happened?

Since Python 3.12, the following code triggers a segmentation fault:

import _io, sys; _io._TextIOBase.detach.__get__(sys.stderr)

CPython versions tested on:

3.9, 3.11, 3.12, 3.13, 3.14

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

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3.13bugs and security fixesbugs and security fixes3.14bugs and security fixesbugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

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