Date: Fri, 24 Jan 2020 11:56:52 -0800
From: Christian Huitema <notifications@github.com>
Reply-To: quicwg/base-drafts
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Message-ID: <quicwg/base-drafts/issues/3395@github.com>
Subject: [quicwg/base-drafts] Discarding Initial context too soon leads to
 deadlock (#3395)
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Transport draft-25 says:
```
17.2.2.1.  Abandoning Initial Packets

   A client stops both sending and processing Initial packets when it
   sends its first Handshake packet.
```
That behavior can lead to a deadlock in the following scenario:

1) Client sends Initial
2) Server replies with coalesced packet, Initial+Handshake
3) Client replies with coalesced Initial ACK + Handshake ACK and waits for next server packet
4) Client's packet is lost
5) Server implements anti-amplification attack, waits for full size client packet before sending anything

I suggest changing the text to: _A client stops both sending and processing Initial packets when it
   sends its first **ack-eliciting** Handshake packet_



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<p>Transport draft-25 says:</p>
<pre><code>17.2.2.1.  Abandoning Initial Packets

   A client stops both sending and processing Initial packets when it
   sends its first Handshake packet.
</code></pre>
<p>That behavior can lead to a deadlock in the following scenario:</p>
<ol>
<li>Client sends Initial</li>
<li>Server replies with coalesced packet, Initial+Handshake</li>
<li>Client replies with coalesced Initial ACK + Handshake ACK and waits for next server packet</li>
<li>Client's packet is lost</li>
<li>Server implements anti-amplification attack, waits for full size client packet before sending anything</li>
</ol>
<p>I suggest changing the text to: <em>A client stops both sending and processing Initial packets when it<br>
sends its first <strong>ack-eliciting</strong> Handshake packet</em></p>

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