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If an agent try to set a variable with the NULL data type, an unset is perform instead to avoid undefined behaviors. Once decoded, such data are translated to a sample with the type SMP_T_ANY. It is unexpected in HAProxy. When a variable is set with such sample, no data are attached to the variable. Thus, when the variable is retrieved later in the transaction, the sample data are uninitialized, leading to undefined behaviors depending on how it is used. For instance, it leads to a crash if the debug converter is used on such variable. This patch should fix the issue #855. It must be backported as far as 1.8.
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)