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Dragan Dosen found that the listeners lock is not sufficient to protect the listeners list when proxies are stopping because the listeners are also unlinked from the protocol list, and under certain situations like bombing with soft-stop signals or shutting down many frontends in parallel from multiple CLI connections, it could be possible to provoke multiple instances of delete_listener() to be called in parallel for different listeners, thus corrupting the protocol lists. Such operations are pretty rare, they are performed once per proxy upon startup and once per proxy on shut down. Thus there is no point trying to optimize anything and we can use a global lock to protect the protocol lists during these manipulations. This fix (or a variant) will have to be backported as far as 1.8.
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)