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HAProxy - Load balancer
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Willy Tarreau 1151fe6818 BUG/MEDIUM: debug: don't set the STUCK flag from debug_handler() 
Since 2.0 with commit e6a02fa65a ("MINOR: threads: add a "stuck" flag
to the thread_info struct"), the TH_FL_STUCK flag was set by the
debugger to flag that a thread was stuck and report it in the output.

However, two commits later (2bfefdbaef "MAJOR: watchdog: implement a
thread lockup detection mechanism"), this flag was used to detect that
a thread had already been reported as stuck. The problem is that it
seldom happens that a "show threads" command instantly crashes because
it calls debug_handler(), which sets the flag, and if the watchdog timer
was about to trigger before going back to the scheduler, the watchdog
believes that the thread has been stuck for a while and will kill the
process.

The issue was magnified in 3.1 with the lower-delay warning, because
it's possible for a thread to die on the next wakeup after the first
warning (which calls debug_handler() hence sets the STUCK flag).

One good approach would have been to use two distinct flags, one for
"stuck" as reported by the debug handler, and one for "stuck" as seen
by the watchdog. However, one could also argue that since the second
commit, given that the wdt monitors the threads, there's no point any
more for the debug handler to set the flag itself. Removing this code
means that two consecutive "show threads" will not report "stuck" until
the watchdog sets it, which aligns better with expectations.

This can be backported to all stable releases. This code has changed a
bit over time, the "if" block and the harmless variables just need to
be removed.
2024-11-21 19:58:05 +01:00
.github MEDIUM: mworker: remove USE_SYSTEMD requirement for -Ws 2024-11-20 12:07:38 +01:00
addons MINOR: promex: Add global and proxies description as labels to all metrics 2024-11-15 14:25:13 +01:00
admin CLEANUP: assorted typo fixes in the code and comments 2024-09-03 17:49:21 +02:00
dev DEV: phash: Update 414 and 431 status codes to phash 2024-11-19 15:29:40 +01:00
doc BUG/MINOR: config: allow to check HAPROXY_LOCALPEER in config 2024-11-21 19:55:21 +01:00
examples EXAMPLES: add "traces.cfg" with traces examples 2024-11-06 17:32:32 +01:00
include MINOR: startup: use global progname variable 2024-11-21 19:55:21 +01:00
reg-tests REGTESTS: disable temporarly mworker test on OSX 2024-11-20 17:13:59 +01:00
scripts CI: vtest: temporarily build from the sd-notify PR 2024-11-20 12:07:38 +01:00
src BUG/MEDIUM: debug: don't set the STUCK flag from debug_handler() 2024-11-21 19:58:05 +01:00
tests MAJOR: import: update mt_list to support exponential back-off (try #2) 2024-07-09 16:46:38 +02:00
.cirrus.yml CI: cirrus-ci: bump FreeBSD image to 14-1 2024-10-14 14:28:26 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore CONTRIB: Add vi file extensions to .gitignore 2023-06-02 18:14:34 +02:00
.mailmap DOC: update Tim's address in .mailmap 2021-09-16 09:14:14 +02:00
.travis.yml MEDIUM: mworker: remove USE_SYSTEMD requirement for -Ws 2024-11-20 12:07:38 +01:00
BRANCHES DOC: fix some spelling issues over multiple files 2021-01-08 14:53:47 +01:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.1-dev13 2024-11-15 18:42:29 +01:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
INSTALL MEDIUM: mworker: remove USE_SYSTEMD requirement for -Ws 2024-11-20 12:07:38 +01:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS MAJOR: spoe: Let the SPOE back into the game 2024-05-22 09:04:38 +02:00
Makefile BUILD: makefile: reorder object files by build time 2024-11-20 18:49:56 +01:00
README.md DOC: change the link to the FreeBSD CI in README.md 2024-06-03 15:21:29 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.1-dev13 2024-11-15 18:42:29 +01:00
VERSION [RELEASE] Released version 3.1-dev13 2024-11-15 18:42:29 +01:00

README.md

HAProxy

alpine/musl AWS-LC openssl no-deprecated Illumos NetBSD FreeBSD VTest

HAProxy logo

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:

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.