[3.12] gh-125451: Fix deadlock in ProcessPoolExecutor shutdown (GH-125492)#125599
Merged
colesbury merged 1 commit intopython:3.12from Oct 16, 2024
Merged
[3.12] gh-125451: Fix deadlock in ProcessPoolExecutor shutdown (GH-125492)#125599colesbury merged 1 commit intopython:3.12from
colesbury merged 1 commit intopython:3.12from
Conversation
…ythonGH-125492) There was a deadlock when `ProcessPoolExecutor` shuts down at the same time that a queueing thread handles an error processing a task. Don't use `_shutdown_lock` to protect the `_ThreadWakeup` pipes -- use an internal lock instead. This fixes the ordering deadlock where the `ExecutorManagerThread` holds the `_shutdown_lock` and joins the queueing thread, while the queueing thread is attempting to acquire the `_shutdown_lock` while closing the `_ThreadWakeup`. (cherry picked from commit 760872e) Co-authored-by: Sam Gross <colesbury@gmail.com>
This was referenced Oct 16, 2024
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
There was a deadlock when
ProcessPoolExecutorshuts down at the same time that a queueing thread handles an error processing a task.Don't use
_shutdown_lockto protect the_ThreadWakeuppipes -- use an internal lock instead. This fixes the ordering deadlock where theExecutorManagerThreadholds the_shutdown_lockand joins the queueing thread, while the queueing thread is attempting to acquire the_shutdown_lockwhile closing the_ThreadWakeup.(cherry picked from commit 760872e)