Experienced this bug also on 12.04. Seems to come from mod-perl.
# cat /etc/issue
Ubuntu 12.04.2 LTS \n \l
# uname -a
Linux --- 3.2.0-51-virtual #77-Ubuntu SMP Wed Jul 24 20:38:32 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
# dpkg-query -l | grep apache
ii apache2-mpm-prefork
Experienced this bug also on 12.04. Seems to come from mod-perl.
# cat /etc/issue
Ubuntu 12.04.2 LTS \n \l
# uname -a
Linux --- 3.2.0-51-virtual #77-Ubuntu SMP Wed Jul 24 20:38:32 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
# dpkg-query -l | grep apache
ii apache2-mpm-prefork