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In run_tasks_from_task_list() we may free some tasks that have been killed. Before doing so we unlink them from the wait queue. But if such a task is in the global wait queue, the queue isn't locked so this can result in corrupting the global task list and causing loops or crashes. It's very likely one cause of issue #758. This must be backported to 2.2. For 2.1 there doesn't seem to be any case where a task could be freed this way while in the global queue, but it doesn't cost much to apply the same change (the code is in process_runnable_task there).
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)