Fix deadlock on shutdown if test_current_{exception,frames} fails #102019
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These tests spawn a thread that waits on a threading.Event. If the test fails any of its assertions, the Event won't be signaled and the thread will wait indefinitely, causing a deadlock when threading._shutdown() tries to join all outstanding threads. Co-authored-by: Brett Simmers <bsimmers@meta.com>
jbower-fb force-pushed the fix-deadlock branch from cfdafc8 to 2e3b2e7 Compare 
JelleZijlstra pushed a commit to JelleZijlstra/cpython that referenced this pull request Sep 10, 2024
…thon#102019) * Don't deadlock on shutdown if test_current_{exception,frames} fails These tests spawn a thread that waits on a threading.Event. If the test fails any of its assertions, the Event won't be signaled and the thread will wait indefinitely, causing a deadlock when threading._shutdown() tries to join all outstanding threads. Co-authored-by: Brett Simmers <bsimmers@meta.com> * Add a news entry * Fix whitespace --------- Co-authored-by: Brett Simmers <bsimmers@meta.com> Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>
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These tests spawn a thread that waits on a
threading.Event. If the test fails any of its assertions, theEventwon't be signaled and the thread will wait indefinitely, causing a deadlock whenthreading._shutdown()tries to join all outstanding threads.The solution is just to put the code in a
try-finallyblock, with the existing clean-up in thefinally.@swtaarrs found and fixed this originally while working on Cinder.
Hopefully this is trivial enough to not need an issue or a NEWS blurb.