[3.13] gh-127421: Fix race in test_start_new_thread_failed (GH-127549) #127574
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…27549) Fix race in test_start_new_thread_failed When we succeed in starting a new thread, for example if setrlimit was ineffective, we must wait for the newly spawned thread to exit. Otherwise, we run the risk that the newly spawned thread will race with runtime finalization and access memory that has already been clobbered/freed. `_thread.start_new_thread()` only spawns daemon threads, which the runtime does not wait for at shutdown, and does not return a handle. Use `_thread.start_joinable_thread()` and join the resulting handle when the thread is started successfully. (cherry picked from commit 13b68e1) Co-authored-by: mpage <mpage@meta.com>
This was referenced Dec 3, 2024
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Fix race in test_start_new_thread_failed
When we succeed in starting a new thread, for example if setrlimit
was ineffective, we must wait for the newly spawned thread to exit.
Otherwise, we run the risk that the newly spawned thread will race
with runtime finalization and access memory that has already been
clobbered/freed.
_thread.start_new_thread()only spawns daemon threads, which the runtimedoes not wait for at shutdown, and does not return a handle. Use
_thread.start_joinable_thread()and join the resulting handle whenthe thread is started successfully.
(cherry picked from commit 13b68e1)
Co-authored-by: mpage mpage@meta.com
test_start_new_thread_failedflaky: failed on macOS (free threading) #127421