From a661392f8fb5ac4fc095aa1845d1eb7a25c4e9be Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Thu, 17 Oct 2019 00:29:12 +0200
Subject: bpo-37531: regrtest now catchs ProcessLookupError (GH-16827)

Fix a warning on a race condition on TestWorkerProcess.kill(): ignore
silently ProcessLookupError rather than logging an useless warning.
---
 Lib/test/libregrtest/runtest_mp.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Lib/test/libregrtest/runtest_mp.py b/Lib/test/libregrtest/runtest_mp.py
index 71db8d6..8026de1 100644
--- a/Lib/test/libregrtest/runtest_mp.py
+++ b/Lib/test/libregrtest/runtest_mp.py
@@ -152,6 +152,11 @@ class TestWorkerProcess(threading.Thread):
         print(f"Kill {self}", file=sys.stderr, flush=True)
         try:
             popen.kill()
+        except ProcessLookupError:
+            # Process completed, the TestWorkerProcess thread read its exit
+            # status, but Popen.send_signal() read the returncode just before
+            # Popen.wait() set returncode.
+            pass
         except OSError as exc:
             print_warning(f"Failed to kill {self}: {exc!r}")
 
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