Crash report

What happened?

import io
f = io.BytesIO()
a = f.getbuffer()
b = f.getbuffer()

Output:

python: ./Modules/_io/bytesio.c:112: unshare_buffer: Assertion `self->exports == 0' failed.
Aborted (core dumped)

Reproduced on 3.8 and 3.11-3.13.

CPython versions tested on:

3.8, 3.11, 3.12, CPython main branch

Operating systems tested on:

Linux

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

Python 3.13.0a1+ (heads/main:11312eae6e, Oct 22 2023, 02:44:38) [GCC 10.2.1 20210110]

Linked PRs

• gh-111174: Fix crash in getbuffer() called repeatedly for empty BytesIO #111210
• [3.12] gh-111174: Fix crash in getbuffer() called repeatedly for empty BytesIO (GH-111210) #111314
• [3.11] gh-111174: Fix crash in getbuffer() called repeatedly for empty BytesIO (GH-111210) #111315