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GeezerVison is showing github.com — [3.14] gh-159811: Raise OpenSSL errors in `_hashlib.HASH` after re-attaching the thread state (GH-159817) by picnixz · Pull Request #159937 · python/cpython

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@picnixz

@picnixz picnixz commented Oct 20, 2026 •
edited by bedevere-app Bot
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When EVP_DigestUpdate() failed, _hashlib_HASH_hash() raised a Python exception, however, _hashlib.HASH.update() and the _hashlib.HASH constructor release the GIL before calling it when the data is larger than HASHLIB_GIL_MINSIZE bytes.

_hashlib_HASH_hash() now only returns an error status and its callers raise the exception once they have re-attached the thread state.

(cherry picked from commit 6fa2d64)

  • Issue: _hashlib: GIL may be released while attempting to set an exception #159811

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@picnixz
[3.14] pythongh-159811: Raise OpenSSL errors in _hashlib.HASH after…
622a80e
… re-attaching the thread state (pythonGH-159817)

When `EVP_DigestUpdate()` failed, `_hashlib_HASH_hash()` raised a Python
exception, however, `_hashlib.HASH.update()` and the `_hashlib.HASH`
constructor release the GIL before calling it when the data is larger
than `HASHLIB_GIL_MINSIZE` bytes.

`_hashlib_HASH_hash()` now only returns an error status and its callers
raise the exception once they have re-attached the thread state.
(cherry picked from commit 6fa2d64)

Co-authored-by: Bénédikt Tran <[email protected]>
@picnixz
picnixz requested a review from gpshead as a code owner October 20, 2026 18:09
@bedevere-app bedevere-app Bot mentioned this pull request Oct 20, 2026
gh-159811: Raise OpenSSL errors in _hashlib.HASH after re-attaching the thread state #159817
Merged
@bedevere-app bedevere-app Bot added the sprint label Oct 20, 2026
@github-project-automation github-project-automation Bot added this to Sprint Oct 20, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 20, 2026
_hashlib: GIL may be released while attempting to set an exception #159811
Closed
@bedevere-app bedevere-app Bot added the awaiting core review label Oct 20, 2026
@github-project-automation github-project-automation Bot moved this to Todo in Sprint Oct 20, 2026
@picnixz
picnixz merged commit 5eed22f into python:3.14 Oct 20, 2026
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@bedevere-app bedevere-app Bot removed the awaiting core review label Oct 20, 2026
@github-project-automation github-project-automation Bot moved this from Todo to Done in Sprint Oct 20, 2026
@picnixz
picnixz deleted the backport-6fa2d64-3.14 branch October 20, 2026 19:46
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@picnixz
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