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2f2d9020cd
We previously observed random-looking failures from this test. I think they were caused by a race condition where the client tries to reconnect while the server is still closing the connection and has not yet returned to an accepting state. In that case, the server would fail to see and reply to the ClientHello, and the client would have to resend it. I believe logs of failing runs are compatible with this interpretation: - the proxy logs show the new ClientHello and the server's closing Alert are sent the same millisecond. - the client logs show the server's closing Alert is received after the new handshake has been started (discarding message from wrong epoch). The attempted fix is for the client to wait a bit before reconnecting, which should vastly enhance the probability of the server reaching its accepting state before the client tries to reconnect. The value of 1 second is arbitrary but should be more than enough even on loaded machines. The test was run locally 100 times in a row on a slightly loaded machine (an instance of all.sh running in parallel) without any failure after this fix. |
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