c1c2a2bfe0
Commit 7d40b3134 ("MEDIUM: sched: do not run a same task multiple times
in series") required to slightly reorder a few fields in struct tasklet
and task in order to reuse an existing hole and keep tree nodes aligned.
The problem is that nice+expire were placed in struct task just before
rq, and that a 48-bit hole replaces them in struct tasklet on 64-bit
platforms, just before the struct list. However, on 32-bit platforms,
the hole is only 16-bit and preserves nice, but expire is overwritten
by the first pointer of the list element. This is not a problem for
real tasklets which do not use these fields, but it definitely is a
problem for tasks that are cast to tasklets in the run queues, because
the expire field can be overwritten when the task is woken up, and if
requeued as-is, it will expire at a completely random date.
This is what caused certain regtests to fail on i386 and 32-bit arm
machines.
This fix needs to be backported wherever the patch above was backported.
The bug has no effect on 64-bit platforms. The fix doesn't inflate
structs on 64-bit, but will raise struct tasklet from 40 to 44 bytes on
32-bit platforms.
Thanks to William for spotting the problem, bisecting it and providing
a working reproducer.
HAProxy
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:
- 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)
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.