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)