Issue #18762: Print debug info on failure to create new forkserver process.

Also modify test code to hopefully avoid deadlock on failure.

1 files changed, 4 insertions, 2 deletions

diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index f777edc6be..f9be810649 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -3386,7 +3386,8 @@ class TestForkAwareThreadLock(unittest.TestCase):
         if n > 1:
             p = multiprocessing.Process(target=cls.child, args=(n-1, conn))
             p.start()
-            p.join()
+            conn.close()
+            p.join(timeout=5)
         else:
             conn.send(len(util._afterfork_registry))
         conn.close()
@@ -3397,8 +3398,9 @@ class TestForkAwareThreadLock(unittest.TestCase):
         old_size = len(util._afterfork_registry)
         p = multiprocessing.Process(target=self.child, args=(5, w))
         p.start()
+        w.close()
         new_size = r.recv()
-        p.join()
+        p.join(timeout=5)
         self.assertLessEqual(new_size, old_size)
 
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