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A small race exists in buffers with "show sess all". This one wants to show some information grabbed from the buffer (especially in HTX mode). But the thread owning this buffer might just be releasing its area, right after a free() or munmap() call, resulting in a head that is not seen as empty yet though the area was released. It may then be dereferenced by "show sess all" causing a crash. Note that in practice it only happens in debug mode with UAF enabled, but it's tricky enough to fix it right now. This should be backported to stable versions which support threads and a store barrier. It's worth noting that by performing the clearing first, b_free() and b_drop() now become two exact equivalent.
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)