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Title: Incremental GC double-counts work done during the marking phase · Issue #141890 · python/cpython · GitHub

Open Graph Title: Incremental GC double-counts work done during the marking phase · Issue #141890 · python/cpython

X Title: Incremental GC double-counts work done during the marking phase · Issue #141890 · python/cpython

Description: Bug report Both mark_at_start and gc_collect_increment (its caller) decrement work_to_do by the number of objects marked. This can result in incremental collections being delayed longer than expected... I think in extreme situations, col...

Open Graph Description: Bug report Both mark_at_start and gc_collect_increment (its caller) decrement work_to_do by the number of objects marked. This can result in incremental collections being delayed longer than expect...

X Description: Bug report Both mark_at_start and gc_collect_increment (its caller) decrement work_to_do by the number of objects marked. This can result in incremental collections being delayed longer than expect...

Opengraph URL: https://github.com/python/cpython/issues/141890

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og:image:altBug report Both mark_at_start and gc_collect_increment (its caller) decrement work_to_do by the number of objects marked. This can result in incremental collections being delayed longer than expect...
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on Nov 24, 2025https://github.com/python/cpython/issues/141890#issue-3656954740
GH-141890: Fix GC double-counting of marked objects #141891https://github.com/python/cpython/pull/141891
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