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GeezerVison is showing github.com — [3.15] gh-151640: Track sharing of `BytesIO` buffer in free-threaded builds (GH-151651) by ZeroIntensity · Pull Request #153151 · python/cpython

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@ZeroIntensity

@ZeroIntensity ZeroIntensity commented Jul 6, 2026 •
edited by bedevere-app Bot
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(cherry picked from commit 881a13a)

  • Issue: Data race between resize_buffer_lock_held and _Py_DecRefShared on a shared BytesIO buffer #151640

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@pedramkarimii @ZeroIntensity
[3.15] pythongh-151640: Track sharing of BytesIO buffer in free-thr…
b69e2dc 
…eaded builds (pythonGH-151651)

(cherry picked from commit 881a13a)

Co-authored-by: Pedram Karimi <[email protected]>
@python-cla-bot

python-cla-bot Bot commented Jul 6, 2026 •
edited
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All commit authors signed the Contributor License Agreement.

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This was referenced Jul 6, 2026
Data race between resize_buffer_lock_held and _Py_DecRefShared on a shared BytesIO buffer #151640
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gh-151640: Track sharing of BytesIO buffer in free-threaded builds #151651
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@bedevere-app bedevere-app Bot added the awaiting core review label Jul 6, 2026
@ZeroIntensity

ZeroIntensity commented Jul 6, 2026

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@pedramkarimii Could you resign the CLA using your GitHub account email?
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@pedramkarimii

pedramkarimii commented Jul 6, 2026

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@ZeroIntensity Done, thank you. I re-signed the CLA using my GitHub account email.
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@pedramkarimii

pedramkarimii commented Jul 6, 2026

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I investigated the failing free-threaded checks. In the 3.15 backport, the new regression test calls BytesIO.peek(), which is not available on that branch. This raises AttributeError in the reader threads and causes regrtest to report ENV CHANGED.

The observed failures are caused by the test incompatibility rather than the COW change itself. The backport test needs the peek() call removed. I can prepare a small follow-up patch for that adjustment if that would be helpful.
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@nascheme
Remove peek() call, not in 3.15.
f6b9a6a
@nascheme
nascheme merged commit 3e19df0 into python:3.15 Jul 9, 2026
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@bedevere-app bedevere-app Bot removed the awaiting core review label Jul 9, 2026
@ZeroIntensity
ZeroIntensity deleted the backport-881a13a-3.15 branch July 9, 2026 11:10
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3 participants

@ZeroIntensity @pedramkarimii @nascheme
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