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This bug arrived with this commit:
MEDIUM: quic: Ack delay implementation
After having probed the Handshake packet number space, one must not select the
Application encryption level to continue trying building packets as this is done
when the connection is not probing. Indeed, if the ACK timer has been triggered
in the meantime, the packet builder will try to build a packet at the Application
encryption level to acknowledge the received packet. But there is very often
no 01RTT packet to acknowledge when the connection is probing before the
handshake is completed. This triggers a BUG_ON() in qc_do_build_pkt() which
checks that the tree of ACK ranges to be used is not empty.
Thank you to @Tristan971 for having reported this issue in GH #2109.
Must be backported to 2.6 and 2.7.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)