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60e3460966
NE link writes are blocking and don't support timeout. When shutting
down a UDP session, the OCCPacket may fail to send and lock the session
in a stale state ("Active" but dead), with an infinite loop of "Failed
TUN read" messages in the log.
- First, [add cancellation handlers to NE UDP/TCP
sockets](https://github.com/passepartoutvpn/passepartoutkit-source/pull/464)
- Then, rather than writing the exit packet in the foreground and
scheduling cancellation:
- Write the packet in a background task
- Wait until timeout in the actor
- Cancel the pending write and go ahead
This may still leak if NE socket cancellation doesn't work, but will
prevent deadlock.
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