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Problem: In socket_connect(), if connecting to the given TCP address times out, libuv is still trying to connect to the address, and connect_cb may be called when running the libuv event loop after the `status` variable referenced by `req.data` goes out of scope. Solution: Close the uv_tcp_t handle and wait for connect_cb to be called before retrying or failing in socket_connect(). This also avoid leaking libuv handles. The tests added here only check that the non-timeout case still works, as checking the timeout case is very hard without modifications to the code. Removing the first LOOP_PROCESS_EVENT_UNTIL() in socket_connect() (the one with the timeout) is a way to check that manually. Also add a comment about the cause of the ASAN error in #34586.