Try harder to reap dangling threads in test.support.reap_threads().
diff --git a/Misc/NEWS b/Misc/NEWS
index 00bce49..02b59dc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -67,6 +67,8 @@
 Tests
 -----
 
+- Try harder to reap dangling threads in test.support.reap_threads().
+
 - Issue #12573: Add resource checks for dangling Thread and Process objects.
 
 - Issue #12549: Correct test_platform to not fail when OS X returns 'x86_64'