group.of.nepali.translators team mailing list archive
-
group.of.nepali.translators team
-
Mailing list archive
-
Message #35906
[Bug 1565744] Re: "Mutex file:${APACHE_LOCK_DIR} default" should be disabled by default on Linux because it leads to errors
Can we get the following backported to Xenial (so 2.4.18-2ubuntu3.14)?
| apache2 (2.4.20-1) unstable; urgency=medium
|
| * On Linux, use pthread mutexes. On kfreebsd/hurd, continue using fctnl
| because they lack robust pthred mutexes. LP: #1565744, #1527044
Seeing it on a couple of Xenial hosts and the fix being to comment out
the following line from /etc/apache2/apache2.conf:
| Mutex file:${APACHE_LOCK_DIR} default
** Also affects: apache2 (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: apache2 (Ubuntu Xenial)
Status: New => Confirmed
--
You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1565744
Title:
"Mutex file:${APACHE_LOCK_DIR} default" should be disabled by default
on Linux because it leads to errors
Status in apache2 package in Ubuntu:
Fix Released
Status in apache2 source package in Xenial:
Confirmed
Bug description:
OS:
Ubuntu 14.04 LTS
Kernel:
3.13.0-79-generic x86_64
Apache:
2.4.7-1ubuntu4.5
In the default Apache 2.4 config on Ubuntu 14.04 LTS is the following
set in /etc/apache2/apache2.conf:
Mutex file:${APACHE_LOCK_DIR} default
(/debian/config-dir/apache2.conf in
http://archive.ubuntu.com/ubuntu/pool/main/a/apache2/apache2_2.4.7-1ubuntu4.5.debian.tar.gz)
which leads to the following output of "apache2ctl -t -D
DUMP_RUN_CFG":
Mutex default: dir="/var/lock/apache2" mechanism=fcntl
This leads constantly to a lot of these warning/emergency messages on
a server with 200 busy worker threads, 100 Requests/s, 300 KB/s:
[Tue Mar 08 16:08:18.596653 2016] [ssl:warn] [pid 8339:tid
140182179256064] (35)Resource deadlock avoided: AH02026: Failed to
acquire SSL session cache lock
[Wed Mar 09 07:09:31.099331 2016] [mpm_worker:emerg] [pid 26526:tid
139668485949184] (35)Resource deadlock avoided: AH00273:
apr_proc_mutex_lock failed. Attempting to shutdown process gracefully.
Solution (as suggested by Yann Ylavic from Apache):
Commenting (removing) the Mutex directive, which leads to the following output of "apache2ctl -t -D DUMP_RUN_CFG":
Mutex default: dir="/var/run/apache2/" mechanism=default
Then, there are no error messages anymore.
For the discussion, see the corresponding Apache httpd-users mailing
list thread:
http://httpd.markmail.org/message/c7w5aujfmy2kfazi
(thread subject 'Lots of messages "[ssl:warn] Resource deadlock
avoided: AH02026: Failed to acquire SSL session cache lock"' from
2016-03-08)
Here some more information:
# apache2ctl -V
Server version: Apache/2.4.7 (Ubuntu)
Server built: Jul 24 2015 17:25:11
Server's Module Magic Number: 20120211:27
Server loaded: APR 1.5.1-dev, APR-UTIL 1.5.3
Compiled using: APR 1.5.1-dev, APR-UTIL 1.5.3
Architecture: 64-bit
Server MPM: worker
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with....
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=256
-D HTTPD_ROOT="/etc/apache2"
-D SUEXEC_BIN="/usr/lib/apache2/suexec"
-D DEFAULT_PIDLOG="/var/run/apache2.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="mime.types"
-D SERVER_CONFIG_FILE="apache2.conf"
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1565744/+subscriptions