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If an isolated thread is marked as harmless, it will loop forever in thread_harmless_till_end() waiting no threads are isolated anymore. It never happens because the current thread is isolated. To fix the bug, we exclude the current thread for the test. We now wait for all other threads to leave the rendez-vous point. This bug only seems to occurr if HAProxy is compiled with DEBUG_UAF, when pool_gc() is called. pool_gc() isolates the current thread, while pool_free_area() set the thread as harmless when munmap is called. This patch must be backported as far as 2.0.
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)