bpo-40550: Fix time-of-check/time-of-action issue in subprocess.Popen.send_signal. (GH-20010)
send_signal() now swallows the exception if the process it thought was still alive winds up not to exist anymore (always a plausible race condition despite the checks).
Co-authored-by: Gregory P. Smith <greg@krypto.org>
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 6a6c2fc..e259dc3 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -2078,7 +2078,11 @@
# The race condition can still happen if the race condition
# described above happens between the returncode test
# and the kill() call.
- os.kill(self.pid, sig)
+ try:
+ os.kill(self.pid, sig)
+ except ProcessLookupError:
+ # Supress the race condition error; bpo-40550.
+ pass
def terminate(self):
"""Terminate the process with SIGTERM