25996165108
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Ran 17 May 2026 04:22PM UTC

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Build # 25996165108

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push

github

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web-flow

Commit Message

Fix UDPSocket.aclose() returning before FD release on asyncio backend (#1147)

UDPSocket.aclose() on the asyncio backend delegated to asyncio.DatagramTransport.close(), which only *schedules* the FD-closing connection_lost callback via loop.call_soon and returns immediately. A caller binding a fresh socket to the same (host, port) on the next line (typical with the from_socket pattern) therefore raced the scheduled close and saw EADDRINUSE. create_udp_socket happened to mask this because its own await on create_datagram_endpoint yields once, draining the queued connection_lost.

DatagramProtocol now sets a closed_event from connection_lost, and the UDPSocket / ConnectedUDPSocket aclose methods await it - honouring AsyncResource.aclose's "close the resource" contract on both paths.

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