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zerortt QNS interop failures #1874

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larseggert opened this issue May 3, 2024 · 2 comments · May be fixed by #1998
Open

zerortt QNS interop failures #1874

larseggert opened this issue May 3, 2024 · 2 comments · May be fixed by #1998

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@larseggert
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Our client randomly fails zerortt interop tests with various servers. This seems to happen, because while the client correctly sends a lot of stream data in 0-RTT packets, it declares them all as lost and retransmits everything in 1-RTT, causing the interop runner to (correctly) declare a failure.
@larseggert
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Still happening, e.g., https://interop.seemann.io/logs/2024-07-18T01:39/quic-go_neqo/zerortt/output.txt

@larseggert larseggert mentioned this issue Jul 19, 2024
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@larseggert
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I bisected this, and I'm reasonably sure this got broken by 4852dc6, i.e., DPLPMTUD.

(Reasonably, because the interop test only fails sporadically. I ran repeated runs for at least ten minutes against quic-go as server, and that's the commit it landed on. 4852dc6 is definitely bad, but maybe an earlier one is already bad but wasn't caught. Unlikely though.)

@larseggert larseggert linked a pull request Jul 21, 2024 that will close this issue
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fix: No time-based loss detection before largest_acked & fixes larseggert/neqo
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@larseggert