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In bug #495 we found that it is possible to resume a listener on an inexistent thread. This happens when a bind's thread_mask contains bits out of the active threads mask, such as when using "1/odd" or "1/even". The thread_mask was used as-is to pick a thread number to re-enable the listener, and given that the highest number is used, 1/odd or 1/even can produce quite high thread numbers and crash the process by queuing some entries into non-existent lists. This bug is an incomplete fix of commit 413e926ba ("BUG/MAJOR: listener: fix thread safety in resume_listener()") though it will only trigger if some bind lines are explicitly bound to thread numbers higher than the thread count. The fix must be backported to all branches having the fix above (as far as 1.8, though the code is different there, see the commit message in 1.8 for changes). There are a few other places where bind_thread is used without enforcing all_thread_mask, namely when doing fd_insert() while creating listeners. It seems harmless but would probably deserve another fix. |
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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)