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This patch adds a lock on the struct dgram_conn to ensure that an other thread cannot trash a fd or alter its status while the current thread processing it on for send/receive/connect operations. Starting with the 2.4 version this could cause a crash when a DNS request is failing, setting the FD of the dgram structure to -1. If the dgram structure is reused after that, a read access to fdtab[-1] is attempted. The crash was only triggered when compiled with ASAN. In previous versions the concurrency issue also exists but is less likely to crash. This patch must be backported until v2.4 and should be adapt for v < 2.4.
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)