Comments (3)
marten-seemann
commented on September 23, 2024
1
AFAIK disabling this is recommended: https://blog.trailofbits.com/2019/03/25/what-application-developers-need-to-know-about-tls-early-data-0rtt/
It most definitely is not. 0-RTT is only used for GET requests, and only if the request method is set to http3.MethodGet0RTT.
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marten-seemann
commented on September 23, 2024
This makes sense. We install the server's updated transport parameters when we process the Encrypted Extensions during the handshake. The race condition occurs because creating a new streams needs to look up the peer's flow control limits.
In the 1-RTT handshake this is not a problem, since streams can only be opened after completion of the handshake. When using 0-RTT, streams can be opened concurrently, leading to the race you're seeing here.
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oliverpool
commented on September 23, 2024
As a workaround, Allow0RTT can be disabled:
Edit: the data-race still happens with 0-RTT disabled. The stacktrace is like the one in #4228. Sorry for the unrelated noise.
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