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:

No response

Linked PRs

• gh-132747: FixNULL dereference when calling a method's__get__ manually #132772
• [3.13] gh-132747: FixNULL dereference when calling a method's__get__ manually (GH-132772) #132786