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When an error occurred during the request parsing, the H1 multiplexer is responsible to sent a response to the client and to release the H1 stream and the H1 connection. In HTTP mode, it is not an issue because at this stage the H1 connection is in embryonic state. Thus it can be released immediately. However, it is a problem if the connection was first upgraded from a TCP connection. In this case, a stream-connector is attached. The H1 stream is not orphan. Thus it must not be released at this stage. It must be detached first. Otherwise a BUG_ON() is triggered in h1s_destroy(). So now, the H1S is destroyed on early errors but only if the H1C is in embryonic state. This patch may be related to #1966. It must be backported to 2.7.
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)