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kozlovsky avatar kozlovsky commented on May 25, 2024

The reason for the bug:

  • ProactorEventLoop uses WSASendTo and WSARecvFrom API calls to send a UDP datagram.
  • After WSASendTo sends a packet to an unreachable client, it gets an ICMP unreachable message.
  • The next server call to WSARecvFrom receives OSError "[WinError 1234] No service is operating at the destination network endpoint on the remote system".
  • The error received relates to the previous sending attempt, but Python's IocpProactor falsely believes the error is related to reading the new datagram. After that, the server logic breaks, and it stops executing further callbacks.

from tribler.

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