Bug#682264: #682264,libapache2-mod-perl2: Crash at server startup when pre-loading Plack app

[Dmitry Smirnov]

I had the same problem until I've realised that Apache now uses event 
module by default. Solution is simple -- just switch to (traditional) 
MPM Prefork model as follows:

~~~~
a2dismod mpm_event
a2enmod mpm_prefork
~~~~
--
All the best,
 Dmitry Smirnov