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HAProxy - Load balancer
55433f9b34
Some panic dumps are mangled or truncated due to the watchdog firing at the same time on multiple threads and calling ha_panic() simultaneously. What may happen in this case is that the second one waits for the first one to finish but as soon as it's done the second one resets the buffer and dumps again, sometimes resetting the first one's dump. Also the first one's abort() may trigger while the second one is currently dumping, resulting in a full dump followed by a truncated one, leading to confusion. Sometimes some lines appear in the middle of a dump as well. It doesn't happen often and is easier to trigger by causing massive deadlocks. There's no reason for the process to resist to a panic, so we can safely add a counter and no nothing on subsequent calls. Ideally we'd wait there forever but as this may happen inside a signal handler (e.g. watchdog), it doesn't always work, so the easiest thing to do is to return so that the thread is interrupted as soon as possible and brought to the debug handler to be dumped. This should be backported, at least to 2.6 and possibly to older versions as well. |
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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)