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To perform servers resolution, the resolver's lock is first acquired then the server's lock when necessary. However, when the fqdn is set via the CLI, the opposite is performed. So, it is possible to experience an ABBA deadlock. To fix this bug, the server's lock is acquired and released for each subcommand of "set server" with an exception when the fqdn is set. The resolver's lock is first acquired. Of course, this means we must be sure to have a resolver to lock. 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)