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MUX uses qc_send_mux() function to send frames list over a QUIC connection. On network congestion, the lower layer will reject some frames and it is the MUX responsibility to free them. There is another category of error which are when the sendto() fails. In this case, the lower layer will free the packet and its attached frames and the MUX should not touch them. This model was violated by MUX layer for RESET_STREAM and STOP_SENDING emission. In this case, frames were freed every time by the MUX on error. This causes a double free error which lead to a crash. Fix this by always ensuring if frames were rejected by the lower layer before freeing them on the MUX. This is done simply by checking if frame list is not empty, as RESET_STREAM and STOP_SENDING are sent individually. This bug was never reproduced in production. Thus, it is labelled as MINOR. This must be backported up to 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)