test_syslog: test_syslog_threaded() crashs randomly on ARM64 macOS 3.x #98178
Description
test_syslog crashed 4 times in the last 2 days, each time in the test_syslog_threaded() function, on the "ARM64 macOS 3.x" buildbot:
- Today: https://buildbot.python.org/all/#/builders/725/builds/2786
- 2 days ago: https://buildbot.python.org/all/#/builders/725/builds/2780
Example of crash:
Fatal Python error: Segmentation fault Thread 0x000000017bbcf000 (most recent call first): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_syslog.py", line 67 in logger File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.py", line 986 in run File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.py", line 1049 in _bootstrap_inner File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.pymake: *** [buildbottest] Segmentation fault: 11 This crash is on the syslog.syslog() call in a thread. Code:
@threading_helper.requires_working_threading() def test_syslog_threaded(self): start = threading.Event() stop = False def opener(): start.wait(10) i = 1 while not stop: syslog.openlog(f'python-test-{i}') # new string object i += 1 def logger(): start.wait(10) while not stop: syslog.syslog('test message from python test_syslog') # <=== HERE: line 67 orig_si = sys.getswitchinterval() support.setswitchinterval(1e-9) try: threads = [threading.Thread(target=opener)] threads += [threading.Thread(target=logger) for k in range(10)] with threading_helper.start_threads(threads): start.set() time.sleep(0.1) stop = True finally: sys.setswitchinterval(orig_si)