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GeezerVison is showing github.com — [3.15] gh-159811: Raise OpenSSL errors in `_hashlib.HASH` after re-attaching the thread state (GH-159817) by miss-islington · Pull Request #159927 · python/cpython

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@miss-islington

@miss-islington miss-islington 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)

Co-authored-by: Bénédikt Tran [email protected]

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

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@picnixz @miss-islington
pythongh-159811: Raise OpenSSL errors in _hashlib.HASH after re-att…
27bbe41
…aching 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]>
@miss-islington
miss-islington requested review from gpshead and picnixz as code owners October 20, 2026 18:03
@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
@github-project-automation github-project-automation Bot moved this to Todo in 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 review label Oct 20, 2026
picnixz
picnixz approved these changes Oct 20, 2026
View reviewed changes
@bedevere-app bedevere-app Bot removed the awaiting review label Oct 20, 2026
@github-project-automation github-project-automation Bot moved this from Todo to In Progress in Sprint Oct 20, 2026
@bedevere-app bedevere-app Bot added the awaiting merge label Oct 20, 2026
@picnixz
picnixz merged commit 0405f10 into python:3.15 Oct 20, 2026
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@bedevere-app bedevere-app Bot removed the awaiting merge label Oct 20, 2026
@miss-islington
miss-islington deleted the backport-6fa2d64-3.15 branch October 20, 2026 19:47
@github-project-automation github-project-automation Bot moved this from In Progress to Done in Sprint Oct 20, 2026
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@picnixz picnixz picnixz approved these changes
@gpshead gpshead Awaiting requested review from gpshead gpshead is a code owner

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2 participants

@miss-islington @picnixz
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