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 --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx