packet may "stuck" during interactive exchange

[paulperegud]

I'm running multiple pydevp2p instances on local machine on different ports. Nodes are running an interactive subprotocol (sort of a custom handshake) where they send challenge and await challenge response. Sometimes challenge is not delivered (usually challenge from node that accepted the connection).

I'm preparing a testcase which will help to reproduce this bug.

OS: Ubuntu 16.10: Linux 4.8.0-41-generic SMP x86_64

[paulperegud]

demo that reproduces the bug:
https://github.com/paulperegud/pydevp2p-packet-loss

To run it execute:

kill $(jobs -p); reset; for i in {0..10}; do sleep 0.5; python simplehandshake/app.py -l :error run $i & done