[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[STINNER Victor]

STINNER Victor <vstin...@python.org> added the comment:

I'm able to reproduce the issue if I reduce the sleep:

diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 4cd8c7e25d..fc395dc473 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -1177,7 +1177,7 @@ class MemoryHandlerTest(BaseTest):
         self.mem_hdlr.setTarget(target)
 
         for _ in range(10):
-            time.sleep(0.005)
+            time.sleep(1e-9)
             self.mem_logger.info("not flushed")
             self.mem_logger.warning("flushed")
 


With the command:

$ ./python -m test test_logging -m test_race_between_set_target_and_flush -F 
-j10 --fail-env-changed 
(...)
0:00:03 load avg: 3.74 [ 18/1] test_logging failed (env changed)
Warning -- threading_cleanup() failed to cleanup 1 threads (count: 1, dangling: 
2)
Warning -- Dangling thread: <Thread(Thread-1 (removeTarget), started daemon 
139860955428608)>
Warning -- Dangling thread: <_MainThread(MainThread, started 139861194377024)>

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<https://bugs.python.org/issue41739>
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