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HAProxy - Load balancer
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William Lallemand e2d88e3354 BUG/MEDIUM: lua: register hlua_init() as a pre-check to fix crash without Lua config 
Commit 1c59c39171 deferred hlua_init() to be called lazily from the
config keyword handlers (lua-load, lua-load-per-thread,
lua-prepend-path, tune.lua.openlibs), with a call inside
hlua_post_init() as a safety net for the case where no Lua directive
appears in the configuration at all.

The problem is hlua_init() is a function that allocates internal
servers (socket_proxy, socket_tcp, socket_ssl) that must exist before
haproxy initialize the configuration. But hlua_post_init() is done too
far after this initialization, so the safety net does not work
correctly.

This would results in a crash in the deinit() if no lua
configuration was loaded in haproxy.

   Core was generated by `./haproxy -W -f /dev/null'.
   Program terminated with signal SIGSEGV, Segmentation fault.
   #0  0x00005671c72b1047 in _ceb_first (root=0x30, kofs=16, key_type=CEB_KT_U64, key_len=0,
       is_dup_ptr=0x7ffc13197a14) at include/import/cebtree-prv.h:1160
   1160		if (!*root)
   (gdb) bt
   #0  0x00005671c72b1047 in _ceb_first (root=0x30, kofs=16, key_type=CEB_KT_U64, key_len=0,
       is_dup_ptr=0x7ffc13197a14) at include/import/cebtree-prv.h:1160
   #1  _ceb64_first (root=0x30, kofs=16) at src/_ceb_int.c:73
   #2  ceb64_ofs_first (root=0x30, kofs=16) at src/_ceb_int.c:66
   #3  0x00005671c6be5e6e in srv_close_idle_conns (srv=0x5671fd592a80) at src/server.c:7676
   #4  0x00005671c6d3be17 in deinit_proxy (p=0x5671fd5d7780) at src/proxy.c:393
   #5  0x00005671c6d3c536 in proxy_drop (p=0x5671fd5d7780) at src/proxy.c:479
   #6  0x00005671c6aed998 in hlua_deinit () at src/hlua.c:14934
   #7  0x00005671c6db2e41 in deinit () at src/haproxy.c:2846
   #8  0x00005671c6db3d98 in deinit_and_exit (status=0) at src/haproxy.c:2966
   #9  0x00005671c6db6111 in main (argc=4, argv=0x7ffc131983c8) at src/haproxy.c:3997

The fix is to do the initialization earlier, in a pre-check callback.

Thanks to Amaury for reporting this issue.

No backport needed.
2026-05-28 18:39:21 +02:00
.github CI: github: add DEBUG_STRICT=2 to ASAN jobs 2026-04-30 17:46:30 +02:00
addons BUILD: addons: convert WURFL addon to EXTRA_MAKE 2026-05-28 16:45:55 +02:00
admin CLEANUP: fix typos and spelling in comments and documentation 2026-03-30 09:24:19 +02:00
dev CLEANUP: fix typos and spelling in comments and documentation 2026-03-30 09:24:19 +02:00
doc BUG/MEDIUM: lua: defer Lua VM initialisation to the first Lua config keyword 2026-05-28 11:36:02 +02:00
examples MEDIUM: mux_quic: rename qmux traces to qcm 2026-05-13 16:23:58 +02:00
include CLEANUP: qpack: move encoded macros to qpack-t.h to avoid duplication 2026-05-27 18:40:53 +02:00
reg-tests REGTESTS: lua: fix tune.lua.openlibs in Lua reg-tests 2026-05-28 11:36:02 +02:00
scripts SCRIPTS: announce-release: add a link to the OpenTelemetry filter 2026-05-08 12:05:09 +02:00
src BUG/MEDIUM: lua: register hlua_init() as a pre-check to fix crash without Lua config 2026-05-28 18:39:21 +02:00
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 CLEANUP: tree-wide: fix typos in user-invisible files 2026-05-13 17:03:48 +02:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.4-dev14 2026-05-26 21:56:40 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2025-04-02 11:12:20 +02:00
INSTALL DOC: update supported gcc and openssl versions in INSTALL 2026-05-20 17:45:23 +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 BUILD: addons: convert WURFL addon to EXTRA_MAKE 2026-05-28 16:45:55 +02:00
README.md CI: github: add cross-zoo.yml in README.md 2026-04-20 11:47:20 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.4-dev14 2026-05-26 21:56:40 +02:00
VERSION [RELEASE] Released version 3.4-dev14 2026-05-26 21:56:40 +02:00

README.md

HAProxy

AWS-LC Illumos NetBSD CrossCompile 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.