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Since the below patch, ring offset calculation for readers has changed. commit d9c718863384e32307f65a9ce319dc362b73feb6 MEDIUM: ring: make the offset relative to the head/tail instead of absolute For readers, this requires to adjust their offsets to be relative to the ring head each time read is resumed. Indeed, buffer head can change any time a ring_write() is performed after older entries were purged. This operation was not performed on the DNS code which causes the offset to become invalid. In most cases, the following BUG_ON() was triggered : FATAL: bug condition "msg_len + ofs + cnt + 1 > b_data(buf)" matched at src/dns.c:522 Fix this by adjusting DNS reader offsets when entering dns_session_io_handler() and dns_process_req(). This bug was reproduced by using a backend with 10 servers using SRV record resolution on a single resolvers section. A BUG_ON() crash would occur after less than 5 minutes of process execution. This does not need to be backported as the above patch is not. This should fix github issue #2068.
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)