mirror of
https://git.haproxy.org/git/haproxy.git/
synced 2025-09-21 05:41:26 +02:00
7428adaf0d
When hlua_event_runner() pauses the subscription (ie: if the consumer can't keep up the pace), hlua_traceback() is used to get the current lua trace (running context) to provide some info to the user. However, as hlua_traceback() may raise an error (__LJMP) is set, it is used within a SET_SAFE_LJMP() / RESET_SAFE_LJMP() combination to ensure lua errors are properly handled and don't result in unexpected behavior. But the current usage of SET_SAFE_LJMP() within the function is wrong since hlua_traceback() will run a second time (unprotected) if the first (protected) attempt fails. This is undefined behavior and could even lead to crashes. Hopefully it is very hard to trigger this code path, thus we can consider this as a minor bug. Also using this as an opportunity to enhance the message report to make it more meaningful to the user. This should fix GH #2159. It is a 2.8 specific bug, no backport needed unless c84899c636 ("MEDIUM: hlua/event_hdl: initial support for event handlers") gets backported.
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)