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HAProxy - Load balancer
19179 commits 28 branches 408 tags 304 MiB
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Willy Tarreau 9debe0fb27 BUG/MEDIUM: debug/thread: make the debug handler not wait for !rdv_requests 
The debug handler may deadlock with some threads waiting for isolation.
This may happend during a "show threads" command or even during a panic.
The reason is the call to thread_harmless_end() which waits for rdv_requests
to turn to zero before releasing its position in thread_dump_state,
while that one may not progress if another thread was interrupted in
thread_isolate() and is waiting for that thread to drop thread_dump_state.

In order to address this, we now use thread_harmless_end_sig() introduced
by previous commit:

   MINOR: threads: add a thread_harmless_end() version that doesn't wait

However there's a catch: since commit f7afdd910 ("MINOR: debug: mark
oneself harmless while waiting for threads to finish"), there's a second
pair of thread_harmless_now()/thread_harmless_end() that surround the
loop around thread_dump_state. Marking a thread harmless before this
loop and dropping that without checking rdv_requests there could break
the harmless promise made to the other thread if it returns first and
proceeds with its isolated work. Hence we just drop this pair which was
only preventive for other signal handlers, while as indicated in that
patch's commit message, other signals are handled asynchronously and do
not require that extra protection.

This fix must be backported to 2.7.

The problem can be seen by running "show threads" in fast loops (100/s)
while reloading haproxy very quickly (10/s) and sending lots of traffic
to it (100krps, 15 Gbps). In this case the soft stop calls pool_gc()
which isolates a lot and manages to race with the dumps after a few
tens of seconds, leaving the process with all threads at 100%.
2023-01-19 19:22:17 +01:00
.github CI: Reformat matrix.py using black 2023-01-03 16:28:34 +01:00
addons BUG/MINOR: promex: Don't forget to consume the request on error 2023-01-13 09:45:23 +01:00
admin BUILD: halog: fix missing double-quote at end of help line 2022-11-25 11:11:41 +01:00
dev DEV: tcploop: add minimal support for unix sockets 2023-01-11 11:27:20 +01:00
doc MEDIUM: bwlim: Support constants limit or period on set-bandwidth-limit actions 2023-01-19 16:15:12 +01:00
examples EXAMPLES: remove completely outdated acl-content-sw.cfg 2022-05-30 18:14:24 +02:00
include MINOR: threads: add a thread_harmless_end() version that doesn't wait 2023-01-19 19:22:17 +01:00
reg-tests BUG/MEDIUM: jwt: Properly process ecdsa signatures (concatenated R and S params) 2023-01-18 16:18:31 +01:00
scripts SCRIPTS: run-regtests: add a version check 2022-11-30 18:44:33 +01:00
src BUG/MEDIUM: debug/thread: make the debug handler not wait for !rdv_requests 2023-01-19 19:22:17 +01:00
tests TESTS: add a unit test for one_among_mask() 2022-06-21 20:29:57 +02:00
.cirrus.yml CI: cirrus-ci: bump FreeBSD image to 13-1 2022-09-09 13:30:17 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore CLEANUP: exclude udp-perturb with .gitignore 2022-09-16 15:47:04 +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
CHANGELOG [RELEASE] Released version 2.8-dev1 2023-01-07 09:45:17 +01:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
INSTALL MINOR: version: mention that it's development again 2022-12-01 15:24:10 +01:00
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: makefile: also list per-option settings in 'make opts' 2022-12-23 17:33:53 +01:00
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 2.8-dev1 2023-01-07 09:45:17 +01:00
VERSION [RELEASE] Released version 2.8-dev1 2023-01-07 09:45:17 +01:00

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)