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The server lock must be held when server_take_conn() and server_drop_conn() lbprm callback functions are called. It is a documented prerequisite but it is not always performed. It only affects leastconn and fas lb algorithm. Others don't use these callback functions. A race condition on the next pending effecive weight (next_eweight) may be encountered with the leastconn lb algorithm. An agent check may set it to 0 while fwlc_srv_reposition() is called. The server is locked during the next_eweight update. But because the server lock is not acquired when fwlc_srv_reposition() is called, we may use it to recompute the server key, leading to a division by 0. This patch must 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)