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The lockless version of pool_flush() had a leftover of the original version causing the pool's first entry to be set to NULL at the end. The problem is that it does this outside of any lock and in a non- atomic way, so that any concurrent alloc+free would result in a lost object. The risk is low and the consequence even lower, given that pool_flush() is only used in pool_destroy() (hence single-threaded) or by stream_free() during a soft-stop (not the place where most allocations happen), so in the worst case it could result in valgrind complaining on soft-stop. The bug was introduced with the first version of the code, in 1.9, so the fix can be backported to all stable versions.
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)