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A H3 unidirectional stream is always opened with its stream type first encoded as a QUIC variable integer. If the STREAM frame contains some data but not enough to decode this varint, haproxy would crash due to an ABORT_NOW() statement. To fix this, ensure we support an incomplete stream type. In this case, h3_init_uni_stream() returns 0 and the buffer content is not cleared. Stream decoding will resume when new data are received for this stream which should be enough to decode the stream type varint. This bug has never occured on production because standard H3 stream types are small enough to be encoded on a single byte. This should be backported up to 2.6.
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)