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From "Hildegard Meier" <daku8...@gmx.de>
Subject [users@httpd] [SOLVED] [users@httpd] Lots of messages "[ssl:warn] Resource deadlock avoided: AH02026: Failed to acquire SSL session cache lock"
Date Mon, 04 Apr 2016 11:35:50 GMT
Hi Yann,

thanks for Your support. Your suggestion to comment(remove) the Mutex directive from /etc/apache2/apache2.conf
solved the problem here.

No warning/emergency errors anymore. :)

Output of "apache2ctl -t -D DUMP_RUN_CFG" is now:

Mutex default: dir="/var/run/apache2/" mechanism=default


> >> > Mutex file:${APACHE_LOCK_DIR} default
> >>
> >> Does it come from Ubuntu?
> >> If so, I don't any modern Linux should configure the "file" mutex
> >> mechanism by default, and you could possibly report it...

Is reported here:
https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1565744

> > I just checked what is the active Mutex:
> >
> > #apache2ctl -t -D DUMP_RUN_CFG
> > ServerRoot: "/etc/apache2"
> > Main DocumentRoot: "/var/www"
> > Main ErrorLog: "/var/log/apache2/error.log"
> > Mutex watchdog-callback: using_defaults
> > Mutex rewrite-map: using_defaults
> > Mutex ssl-stapling: using_defaults
> > Mutex proxy: using_defaults
> > Mutex ssl-cache: using_defaults
> > Mutex default: dir="/var/lock/apache2" mechanism=fcntl
> 
> That's when you configure "Mutex fcntl:/var/lock/apache2" right, not
> by default (no Mutex)?

That's the output having the default Ubuntu 14 configuration directive "Mutex file:${APACHE_LOCK_DIR}
default"


Best regards

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