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It must be done to expire patterns cached in the LRU cache. Otherwise it is possible to retrieve an already freed pattern, attached to a released pattern expression. When a specific pattern is deleted (->delete() callback), the pattern expression revision is already renewed. Thus it is not affected by this bug. Only prune action on the pattern expression is concerned. In addition, for a pattern expression, in ->prune() callbacks when the pattern list is released, a missing LIST_DEL() has been added. It is not a real issue because the list is reinitialized at the end and all elements are released and should never be reused. But it is less confusing this way. This bug may be triggered when a map is cleared from the cli socket. A workaround is to set the pattern cache size (tune.pattern.cache-size) to 0 to disable it. This patch should fix the issue #844. It must be backported to all supported versions.
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)