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qc_new_conn() is used to allocate a quic_conn instance and its various internal members. If one allocation fails, quic_conn_release() is used to cleanup things. For the moment, pool_zalloc() is used which ensures that all content is null. However, some members must be initialized to a special values to be able to use quic_conn_release() safely. This is the case for quic_conn lists and its tasklet. Also, some quic_conn internal allocation functions were doing their own cleanup on failure without reset to NULL. This caused an issue with quic_conn_release() which also frees this members. To fix this, these functions now only return an error without cleanup. It is the caller responsibility to free the allocated content, which is done via quic_conn_release(). Without this patch, allocation failure in qc_new_conn() would often result in segfault. This was reproduced easily using fail-alloc at 10%. 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)