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Willy Tarreau 77b98220e8 BUG/MINOR: threads: work around a libgcc_s issue with chrooting 
Sander Hoentjen reported another issue related to libgcc_s in issue #671.
What happens is that when the old process quits, pthread_exit() calls
something from libgcc_s.so after the process was chrooted, and this is
the first call to that library, causing an attempt to load it. In a
chroot, this fails, thus libthread aborts. The behavior widely differs
between operating systems because some decided to use a static build for
this library.

In 2.2 this was resolved as a side effect of a workaround for the same issue
with the backtrace() call, which is also in libgcc_s. This was in commit
0214b45 ("MINOR: debug: call backtrace() once upon startup"). But backtraces
are not necessarily enabled, and we need something for older versions.

By inspecting a significant number of ligcc_s on various gcc versions and
platforms, it appears that a few functions have been present since gcc 3.0,
one of which, _Unwind_Find_FDE() has no side effect (it only returns a
pointer). What this patch does is that in the thread initialization code,
if built with gcc >= 3.0, a call to this function is made in order to make
sure that libgcc_s is loaded at start up time and that there will be no
need to load it upon exit.

An easy way to check which libs are loaded under Linux is :

  $ strace -e trace=openat ./haproxy -v

With this patch applied, libgcc_s now appears during init.

Sander confirmed that this patch was enough to put an end to the core
dumps on exit in 2.0, so this patch should be backported there, and maybe
as far as 1.8.
2020-09-02 08:13:44 +02:00
.github DOC: overhauling github issue templates 2020-08-17 20:29:27 +02:00
contrib BUG/MEDIUM: contrib/spoa-server: Fix ipv4_address used instead of ipv6_address 2020-09-01 18:28:40 +02:00
doc DOC: add description of pidfile in master-worker mode 2020-08-26 18:40:53 +02:00
examples CLEANUP: assorted typo fixes in the code and comments 2020-06-26 11:27:28 +02:00
include MINOR: http-htx: Handle an optional reason when replacing the response status 2020-09-01 10:55:36 +02:00
reg-tests REGTEST: increase some short timeouts to make tests more reliable 2020-09-02 07:30:34 +02:00
scripts SCRIPTS: git-show-backports: emit the shell command to backport a commit 2020-07-31 16:57:35 +02:00
src BUG/MINOR: threads: work around a libgcc_s issue with chrooting 2020-09-02 08:13:44 +02:00
tests MINOR: lists: rename some MT_LIST operations to clarify them 2020-07-10 08:50:41 +02:00
.cirrus.yml CI: cirrus-ci: exclude slow reg-tests 2020-07-04 06:58:14 +02:00
.gitignore DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
.travis.yml CI: travis-ci: specify SLZ_LIB, SLZ_INC for travis builds 2020-08-05 11:40:14 +02:00
BRANCHES DOC: assorted typo fixes in the documentation 2020-03-09 14:45:58 +01:00
CHANGELOG [RELEASE] Released version 2.3-dev3 2020-08-14 18:54:05 +02:00
CONTRIBUTING DOC: Use gender neutral language 2020-07-26 22:35:43 +02:00
INSTALL MINOR: version: back to development, update status message 2020-07-07 16:38:51 +02:00
LICENSE
MAINTAINERS REORG: include: split hathreads into haproxy/thread.h and haproxy/thread-t.h 2020-06-11 10:18:56 +02:00
Makefile MINOR: sock: introduce sock_inet and sock_unix 2020-08-28 18:51:36 +02:00
README DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
ROADMAP
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VERDATE [RELEASE] Released version 2.3-dev3 2020-08-14 18:54:05 +02:00
VERSION [RELEASE] Released version 2.3-dev3 2020-08-14 18:54:05 +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)