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HAProxy - Load balancer
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Willy Tarreau 4a6dec7193 DEBUG: servers: add a few checks for stress-testing idle conns 
The latest idle conns fix 9481cef948 ("BUG/MEDIUM: connection: do not
reinsert a purgeable conn in idle list") addresses a very hard-to-hit
case which manifests itself with an attempt to reuse a connection fails
because conn->mux is NULL:

  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  0x0000655410b8642c in conn_backend_get (reuse_mode=4, srv=srv@entry=0x6554378a7140,
      sess=sess@entry=0x7cfe140948a0, is_safe=is_safe@entry=0,
      hash=hash@entry=910818338996668161) at src/backend.c:1390
  1390     if (conn->mux->takeover && conn->mux->takeover(conn, i, 0) == 0) {

However the condition that leads to this situation can be detected
earlier, by the presence of the connection in the toremove_list, whose
race window is much larger and easier to detect.

This patch adds a few BUG_ON_STRESS() at selected places that an detect
this condition. When built with -DDEBUG_STRESS and run under stress with
two distinct processes communicating over H2 over SSL, under a stress of
400-500k req/s, the front process usually crashes in the first 10-30s
triggering in _srv_add_idle() if the fix above is reverted (and it does
not crash with the fix).

This is mainly included to serve as an illustration of how to instrument
the code for seamless stress testing.
2025-11-14 17:00:17 +01:00
.github CI: github: update to macos-26 2025-11-03 16:17:36 +01:00
addons MINOR: applet: Add a flag to know an applet is using HTX buffers 2025-08-25 11:11:05 +02:00
admin ADMIN: reload: introduce -vv mode 2025-09-29 19:29:10 +02:00
dev DEV: patchbot: use git reset+checkout instead of pull 2025-10-08 04:38:35 +02:00
doc MINOR: check: ensure QUIC checks configuration coherency 2025-11-14 13:42:08 +01:00
examples MINOR: mailers: warn if mailers are configured but not actually used 2025-06-27 16:41:18 +02:00
include DEBUG: add BUG_ON_STRESS(): a BUG_ON() implemented only when DEBUG_STRESS > 0 2025-11-14 16:42:53 +01:00
reg-tests REGTESTS: ssl: activate ssl_curve_name.vtc for AWS-LC 2025-11-14 11:01:45 +01:00
scripts SCRIPTS: build-ssl: fix rpath in AWS-LC install for openssl and bssl bin 2025-11-03 15:04:57 +01:00
src DEBUG: servers: add a few checks for stress-testing idle conns 2025-11-14 17:00:17 +01:00
tests TESTS: quic: add unit-tests for QUIC TX part 2025-09-08 14:49:03 +02:00
.cirrus.yml CI: cirrus-ci: bump FreeBSD image to 14-3 2025-10-09 14:06:48 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore MINOR: tevt/dev: Add term_events tool 2025-01-31 10:41:50 +01:00
.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: clarify the experimental status for certain features 2025-10-17 18:41:13 +02:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.3-dev12 2025-11-08 12:12:00 +01:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2025-04-02 11:12:20 +02:00
INSTALL BUILD: makefile: bump the default minimum linux version to 4.17 2025-09-05 09:44:56 +02:00
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 MEDIUM: ssl/ech: config and load keys 2025-10-30 10:37:12 +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 3.3-dev12 2025-11-08 12:12:00 +01:00
VERSION [RELEASE] Released version 3.3-dev12 2025-11-08 12:12:00 +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.