Icinga2 2.4.1 crashes at login on php 7.2

[Ben Marsh]

I just upgraded a machine to Ubuntu Bionic. I was using icingaweb2 to monitor a server before the upgrade.

After the upgrade when I try to login to icinga2 I get an error:

Fatal error: Uncaught ErrorException: session_name(): Cannot change session name when session is active in /usr/share/php/Icinga/Web/Session/PhpSession.php:97 Stack trace: #0 [internal function]: Icinga\Application\ApplicationBootstrap->Icinga\Application\{closure}(2, 'session_name():...', '/usr/share/php/...', 97, Array) #1 /usr/share/php/Icinga/Web/Session/PhpSession.php(97): session_name('Icingaweb2') #2 /usr/share/php/Icinga/Web/Session/PhpSession.php(152): Icinga\Web\Session\PhpSession->open() #3 /usr/share/php/Icinga/Web/Controller/ActionController.php(544): Icinga\Web\Session\PhpSession->write() #4 /usr/share/php/Icinga/Web/Controller/ActionController.php(489): Icinga\Web\Controller\ActionController->shutdownSession() #5 /usr/share/icingaweb2/library/vendor/Zend/Controller/Action.php(512): Icinga\Web\Controller\ActionController->postDispatch() #6 /usr/share/php/Icinga/Web/Controller/Dispatcher.php(76): Zend_Controller_Action->dispatch('errorAction') #7 /usr/share/icingaweb2/library/vendor/Zend/Controller/Front.php( in /usr/share/icingaweb2/library/vendor/Zend/Controller/Plugin/Broker.php on line 332

Steps to reproduce

1. Navigate to http://servername/icingaweb2/authentication/login
2. Enter valid username and password
3. Click login button

The error message is displayed as above.

According to the machine these are the versions of the relevant packages:

ii icingaweb2 2.4.1-1 all simple and responsive web interfa
ii libapache2-mod-php7.2 7.2.7-0ubuntu0.18.04.2 amd64

I did some research and think I have found that Icingaweb2 was not compatible with php7.2 until June this year:

A bug ticket:

https://github.com/Icinga/icingaweb2/issues/3185

The fix:

https://github.com/Icinga/icingaweb2/pull/3186

Corresponding to their 2.6.0 milestone

[Ben Marsh (blm-g)]

I swear I did a search to see if this was already raised but failed to find anything. However, I just found an older ticket: https://bugs.launchpad.net/ubuntu/+source/icingaweb2/+bug/1769890. This can be closed as a dupe. Sorry.

[Hans Joachim Desserud (hjd)]

Marking as duplicate of bug 1769890 based on the comment above.

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected, as this automatically adds version numbers and other relevent information. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.