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There is a fundamental design bug in the resolvers code which is that a list of active resolutions is being walked to try to delete outdated entries, and that the code responsible for removing them also removes other elements, including the next one which will be visited by the list iterator. This randomly causes a use-after-free condition leading to crashes, infinite loops and various other issues such as random memory corruption. A first fix for the memory fix for this was brought by commit0efc0993e("BUG/MEDIUM: resolvers: Don't release resolution from a requester callbacks"). While preparing for more fixes, some code was factored by commit11c6c3965("MINOR: resolvers: Clean server in a dedicated function when removing a SRV item"), which inadvertently passed "0" as the "safe" argument all the time, missing one case of removal protection, instead of always using "safe". This patch reintroduces the correct argument. This must be backported with all fixes above. Cc: Christopher Faulet <cfaulet@haproxy.com>
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)