PHP session settings is wrong if user use memcached session storage.
if you do not comment line in index.php
<a class='mention' href='https://github.com/ini_set'>@ini_set</a>('session.save_handler', 'files');
piwik crashed with PHP error
Can not open file
open("tcp://127.0.0.1:11211/some_rand_sessionid"... );
Keywords: session
How are you calling Piwik?
Where did you define your memcache session save handler?
memcache session handler defined in php.ini
when ini_set commented piwik worked fine
(In [1226]) fixes #805 - don't override memcached session handler
Ref'd the wrong ticket:
(In [1227]) - only set session handler if 'user'; all the other handlers are either built-in or through libraries/extensions; see list of supported session handlers #806