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A deadlock is possible with 'set maxconn server' command, if there is pending connection ready to be dequeued. This is caused by the locking of server spinlock in both cli_parse_set_maxconn_server and process_srv_queue. Fix this by reducing the scope of the server lock into server_parse_maxconn_change_request. If connection are dequeued, the lock is taken a second time. This can be seen as suboptimal but as it happens only during 'set maxconn server' it can be considered as tolerable. This issue was reported on the mailing list, for the 1.8.x branch. It must be backported up to the 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)