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When running __signal_process_queue(), we ignore most signals. We can't, however, ignore WDTSIG and DEBUGSIG, otherwise that thread may end up waiting for another one that could hold a glibc lock, while the other thread wait for this one to enter debug_handler(). So make sure WDTSIG and DEBUGSIG aren't ignored, if they are defined. This probably explains the watchdog deadlock described in github issue This should be backported to 2.1, 2.0 and 1.9.
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)