gh-115634: Fix ProcessPoolExecutor deadlock with max_tasks_per_child by gpshead · Pull Request #140900 · python/cpython · GitHub

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gpshead:fix-gh-115634-process-pool-hang

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ProcessPoolExecutor hangs when 1<max_tasks_per_child<num_submitted//max_workers #115634

gh-115634: Force the process pool to adjust when a process worker exits #115642

ProcessPoolExecutor executor manager thread crashes if task fails in some circumstances #119592

ProcessPoolExecutor.map may hang forever when the submitted iterable is far greater than max_tasks_per_child #111498

Add options for max diffs before restarting process edgi-govdata-archiving/web-monitoring-diff#202

github-actions Bot commented May 1, 2026

This PR is stale because it has been open for 30 days with no activity.

: Fix ProcessPoolExecutor deadlock with max_tasks_per_…

needs backport to 3.13

needs backport to 3.14

needs backport to 3.15

awaiting core review

bedevere-app Bot commented Jul 3, 2026

GH-152926 is a backport of this pull request to the 3.15 branch.

: Fix ProcessPoolExecutor deadlock with max_tasks_per…

: Fix ProcessPoolExecutor deadlock with max_tasks_per…

: Fix ProcessPoolExecutor deadlock with max_tasks_per…

ProcessPoolExecutor: pending futures never complete if executor is gc'd while a max_tasks_per_child= worker exits #152967