The test_asyncio.test_sock_lowlevel.py test uses a UDP echo server:

Thread sanitizer complains about the sock.sendto(b'STOP', sock.getsockname()) line in the main thread happening concurrently with the sock.close() in the echo_datagrams thread.

This seems a bit bogus to me: the sendto has to start before the close starts because it triggers the echo_datagrams shutdown, but it's easy enough to avoid the data race. I also think it's better in this case to do a small code change to the test, instead of adding or keeping a global suppression.

Linked PRs

• gh-122187: Avoid TSan reported race in run_udp_echo_server #122189
• [3.13] gh-122187: Avoid TSan reported race in run_udp_echo_server (GH-122189) #122263