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These tests are supposed to:
1. Create a TCP server
2. Open a TCP connection
3. Run a custom connection handler (depending on the particular test) in a new thread
4. When the handler returns, the new thread should call "shutdown_request"
5. Shutdown_request closes the server’s connection socket
6. Shutdown_request sets an event for the main thread
7. Main thread waits for the above event
The stack trace indicates a thread is stuck at step 7. My guess is that step 5 has raised an exception, killing the thread rather than continuing to step 6. I suspect it is a "socket.close" call raising an asynchronous error such as ECONNRESET; see Issue 30319. A general fix for that problem might fix these test_socketserver hangs.