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HAProxy - Load balancer
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Amaury Denoyelle 394bd4eb39 BUG/MAJOR: backend: fix idle conn crash under low FD 
Since the following commit, idle conns are stored in a list as secondary
storage to retrieve them in usage order :
  5afcb686b9
  MAJOR: connection: purge idle conn by last usage

The list usage has been extended wherever connections lookup are done
both on idle and safe trees. This reduced the code size by replacing a
two tree loops by a single list loop.

LIST_ELEM() is used in this context to retrieve the first idle list
element from the server list head. However, macro usage was wrong due to
an extra '&' operator which returns an invalid connection reference.
This will most of the time caused a crash on conn_delete_from_tree() or
affiliated functions.

This bug only occurs if the FD pool is exhausted and some idle
connections are selected to be killed.

It can be reproduced using the following config and h2load command :
$ h2load -t 8 -c 800 -m 10 -n 800 "http://127.0.0.1:21080/?s=10k"

global
	maxconn 100

defaults
	mode http
	timeout connect 20s
	timeout client  20s
	timeout server  20s

listen li
	bind :21080 proto h2
	server nginx 127.99.0.1:30080 proto h1

This bug has been introduced by the above commit. Thus no need to
backport this fix.

Note that LIST_ELEM() macro usage was slightly adjusted also in
srv_migrate_conns_to_remove(). The function used toremove_list instead
of idle_list connection list element. This is not a bug as they are
stored in the same union. However, the new code is clearer as it intends
to move connection from the idle_list only into the toremove_list
mt-list.
2023-10-25 10:30:45 +02:00
.github CI: github: add awslc 1.16.0 to the push CI 2023-10-11 11:38:27 +02:00
addons MEDIUM: tree-wide: logsrv struct becomes logger 2023-10-13 10:05:06 +02:00
admin MINOR: acme.sh: add the deploy script for acme.sh in admin directory 2023-04-26 17:32:15 +02:00
dev DEV: sslkeylogger: handle file opening error 2023-10-03 15:23:35 +02:00
doc MINOR: lua: change tune.lua.log.stderr default from 'on' to 'auto' 2023-10-25 07:49:03 +02:00
examples EXAMPLES: maintain haproxy 2.8 retrocompatibility for lua mailers script 2023-07-11 16:04:22 +02:00
include MINOR: listener: forbid most keywords for reverse HTTP bind 2023-10-20 17:28:08 +02:00
reg-tests MINOR: sample: Added support for Arrays in sample_conv_json_query in sample.c 2023-10-20 18:42:05 +02:00
scripts CI: ssl: add git id support for wolfssl download 2023-10-10 10:34:17 +02:00
src BUG/MAJOR: backend: fix idle conn crash under low FD 2023-10-25 10:30:45 +02:00
tests Revert "MAJOR: import: update mt_list to support exponential back-off" 2023-09-15 17:13:43 +02:00
.cirrus.yml CI: cirrus-ci: display gdb bt if any 2023-09-22 08:28:30 +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 CI: travis-ci: temporarily disable arm64 builds 2021-08-07 07:28:15 +02:00
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 2.9-dev8 2023-10-20 21:36:47 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
INSTALL BUILD: ssl: Build with new cryptographic library AWS-LC 2023-09-04 18:19:18 +02:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS CLEANUP: assorted typo fixes in the code and comments 2022-11-30 14:02:36 +01:00
Makefile BUILD: ssl: Build with new cryptographic library AWS-LC 2023-09-04 18:19:18 +02:00
README DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 2.9-dev8 2023-10-20 21:36:47 +02:00
VERSION [RELEASE] Released version 2.9-dev8 2023-10-20 21:36:47 +02:00

README 

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)