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HAProxy - Load balancer
47f8397afb
In the following trace trying to abuse the watchdog from the CLI's "debug dev loop" command running in parallel to "show threads" loops, it's clear that some re-entrance may happen in ha_thread_dump_fill(). A first minimal fix consists in using a test-and-set on the flag indicating that the function is currently dumping threads, so that the one from the signal just returns. However the caller should be made more reliable to serialize all of this, that's for future work. Here's an example capture of 7 threads stuck waiting for each other: (gdb) bt #0 0x00007fe78d78e147 in sched_yield () from /lib64/libc.so.6 #1 0x0000000000674a05 in ha_thread_relax () at src/thread.c:356 #2 0x00000000005ba4f5 in ha_thread_dump_fill (thr=2, buf=0x7ffdd8e08ab0) at src/debug.c:402 #3 ha_thread_dump_fill (buf=0x7ffdd8e08ab0, thr=<optimized out>) at src/debug.c:384 #4 0x00000000005baac4 in ha_stuck_warning (thr=thr@entry=2) at src/debug.c:840 #5 0x00000000006a360d in wdt_handler (sig=<optimized out>, si=<optimized out>, arg=<optimized out>) at src/wdt.c:156 #6 <signal handler called> #7 0x00007fe78d78e147 in sched_yield () from /lib64/libc.so.6 #8 0x0000000000674a05 in ha_thread_relax () at src/thread.c:356 #9 0x00000000005ba4c2 in ha_thread_dump_fill (thr=2, buf=0x7fe78f2d6420) at src/debug.c:426 #10 ha_thread_dump_fill (buf=0x7fe78f2d6420, thr=2) at src/debug.c:384 #11 0x00000000005ba7c6 in cli_io_handler_show_threads (appctx=0x2a89ab0) at src/debug.c:548 #12 0x000000000057ea43 in cli_io_handler (appctx=0x2a89ab0) at src/cli.c:1176 #13 0x00000000005d7885 in task_process_applet (t=0x2a82730, context=0x2a89ab0, state=<optimized out>) at src/applet.c:920 #14 0x0000000000659002 in run_tasks_from_lists (budgets=budgets@entry=0x7ffdd8e0a5c0) at src/task.c:644 #15 0x0000000000659bd7 in process_runnable_tasks () at src/task.c:886 #16 0x00000000005cdcc9 in run_poll_loop () at src/haproxy.c:2858 #17 0x00000000005ce457 in run_thread_poll_loop (data=<optimized out>) at src/haproxy.c:3075 #18 0x0000000000430628 in main (argc=<optimized out>, argv=<optimized out>) at src/haproxy.c:3665 |
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HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.