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<a href="https://gitlab.com/tatsuhiro-t">Tatsuhiro Tsujikawa</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1239">#1239</a>
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<p dir="auto">Client side early data is fixed by <a href="https://gitlab.com/gnutls/gnutls/-/issues/1216" data-original="#1216" data-link="false" data-link-reference="false" data-project="179611" data-issue="86056649" data-reference-type="issue" data-container="body" data-placement="top" title="Early data issues in QUIC use" class="gfm gfm-issue has-tooltip">#1216</a> and it works great.
For server side, if GnuTLS QUIC server receives early data indication and session ticket, it crashes at:
<a href="https://gitlab.com/gnutls/gnutls/-/blob/e899e3200ffb3d7d8958cfa7685052a66ebfbf80/lib/handshake.c#L799">https://gitlab.com/gnutls/gnutls/-/blob/e899e3200ffb3d7d8958cfa7685052a66ebfbf80/lib/handshake.c#L799</a></p>
<p dir="auto">Reproduction steps:</p>
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<li>Build examples/gtlsserver and examples/gtlsclient from <a href="https://github.com/ngtcp2/ngtcp2/tree/gnutls-exp" rel="nofollow noreferrer noopener" target="_blank">https://github.com/ngtcp2/ngtcp2/tree/gnutls-exp</a> (which requires the latest unreleased GnuTLS).</li>
<li>Run server by <code>examples/gtlsserver 127.0.0.1 4433 /path/to/key /path/to/cert</code>
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<li>Remove session.txt file if it exists.</li>
<li>Run client by <code>examples/gtlsclient 127.0.0.1 4433 https://127.0.0.1:4433 --session-file session.txt --tp-file tp.txt</code> just once. This writes session parameters in session.txt.</li>
<li>Run client again with the same arguments above.</li>
<li>Observe server crashes.</li>
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