I confirm this bug on a freshly installed Ubuntu 12.04.2. However, it does not appear on an apparently similarly configured (yet older, probably installed as a 12.04.1) machine.
$ uname -a
Linux XXXX 3.2.0-49-virtual #75-Ubuntu SMP Tue Jun 18 17:59:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
The point release are the same :
$ cat /etc/issue
Ubuntu 12.04.2 LTS \n \l
Apache is installed with the same packages :
root@okserver:~# dpkg -l | grep apache
ii apache2 2.2.22-1ubuntu1.4 Apache HTTP Server metapackage
ii apache2-mpm-prefork 2.2.22-1ubuntu1.4 Apache HTTP Server - traditional non-threaded model
ii apache2-utils 2.2.22-1ubuntu1.4 utility programs for webservers
ii apache2.2-bin 2.2.22-1ubuntu1.4 Apache HTTP Server common binary files
ii apache2.2-common 2.2.22-1ubuntu1.4 Apache HTTP Server common files
ii libapache2-mod-php5 5.3.10-1ubuntu3.7 server-side, HTML-embedded scripting language (Apache 2 module)
root@misbehavingserver:~# dpkg -l | grep apache
ii apache2 2.2.22-1ubuntu1.4 Apache HTTP Server metapackage
ii apache2-mpm-worker 2.2.22-1ubuntu1.4 Apache HTTP Server - high speed threaded model
ii apache2-utils 2.2.22-1ubuntu1.4 utility programs for webservers
ii apache2.2-bin 2.2.22-1ubuntu1.4 Apache HTTP Server common binary files
ii apache2.2-common 2.2.22-1ubuntu1.4 Apache HTTP Server common files
ii libapache-dbi-perl 1.11-1 interface connecting apache server to database via perl's DBI
ii libapache2-mod-perl2 2.0.5-5ubuntu1 Integration of perl with the Apache2 web server
ii libapache2-reload-perl 0.11-2 module for reloading Perl modules when changed on disk
I confirm this bug on a freshly installed Ubuntu 12.04.2. However, it does not appear on an apparently similarly configured (yet older, probably installed as a 12.04.1) machine.
root@okserver:~# cat /proc/2761/stat 51615 1 1 0 0 0 0 0 4096 201344747 184467440737095 51615 0 0 17 0 0 0 25 0 0
2761 (apache2) S 16432 16432 16432 0 -1 4202816 62931 0 23 0 446 35 0 0 39 19 1 0 15483478 392368128 10767 184467440737095
root@misbehavin gserver: ~# cat /proc/13556/stat 51615 140602045796352 140602046243212 140737419513488 140737419512584 140602031456275 0 0 4096 134235883 184467440715804 58505 0 0 17 0 0 0 0 0 0
13556 (/usr/sbin/apach) S 1 13556 13556 0 -1 4202560 40031 0 0 0 76 16 0 0 20 0 1 0 26449769 302252032 36195 184467440737095
The kernels are the same :
$ uname -a
Linux XXXX 3.2.0-49-virtual #75-Ubuntu SMP Tue Jun 18 17:59:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
The point release are the same :
$ cat /etc/issue
Ubuntu 12.04.2 LTS \n \l
Apache is installed with the same packages :
root@okserver:~# dpkg -l | grep apache
ii apache2 2.2.22-1ubuntu1.4 Apache HTTP Server metapackage
ii apache2-mpm-prefork 2.2.22-1ubuntu1.4 Apache HTTP Server - traditional non-threaded model
ii apache2-utils 2.2.22-1ubuntu1.4 utility programs for webservers
ii apache2.2-bin 2.2.22-1ubuntu1.4 Apache HTTP Server common binary files
ii apache2.2-common 2.2.22-1ubuntu1.4 Apache HTTP Server common files
ii libapache2-mod-php5 5.3.10-1ubuntu3.7 server-side, HTML-embedded scripting language (Apache 2 module)
root@misbehavin gserver: ~# dpkg -l | grep apache mod-perl2 2.0.5-5ubuntu1 Integration of perl with the Apache2 web server reload- perl 0.11-2 module for reloading Perl modules when changed on disk
ii apache2 2.2.22-1ubuntu1.4 Apache HTTP Server metapackage
ii apache2-mpm-worker 2.2.22-1ubuntu1.4 Apache HTTP Server - high speed threaded model
ii apache2-utils 2.2.22-1ubuntu1.4 utility programs for webservers
ii apache2.2-bin 2.2.22-1ubuntu1.4 Apache HTTP Server common binary files
ii apache2.2-common 2.2.22-1ubuntu1.4 Apache HTTP Server common files
ii libapache-dbi-perl 1.11-1 interface connecting apache server to database via perl's DBI
ii libapache2-
ii libapache2-