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gh-142763: Fix race in ZoneInfo cache eviction by colesbury · Pull Request #144978 · python/cpython · GitHub

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gh-142763: Fix race in ZoneInfo cache eviction #144978

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Merged
colesbury merged 2 commits into from
Mar 10, 2026
Conversation 3 Commits 2 Checks 55 Files changed
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gh-142763: Fix race in ZoneInfo cache eviction #144978

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6c4f783
gh-142763: Fix race in ZoneInfo cache eviction
colesbury Feb 18, 2026
6177398
Update blurb
colesbury Feb 18, 2026
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6 changes: 5 additions & 1 deletion Lib/zoneinfo/_zoneinfo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,11 @@ def __new__(cls, key):
cls._strong_cache[key] = cls._strong_cache.pop(key, instance)

if len(cls._strong_cache) > cls._strong_cache_size:
cls._strong_cache.popitem(last=False)
try:
cls._strong_cache.popitem(last=False)
except KeyError:
# another thread may have already emptied the cache
pass

return instance

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-12-18-00-00-00.gh-issue-142763.AJpZPVG5.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix a race condition between :class:`zoneinfo.ZoneInfo` creation and
:func:`zoneinfo.ZoneInfo.clear_cache` that could raise :exc:`KeyError`.
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