Comment # 15 on bug 1186267 from Roy Bellingan

I reported another problem in the apparmor bugtracker
https://gitlab.com/apparmor/apparmor/-/issues/229

In short the default session path is /tmp which is NOT ALLOWED 
The allowed one are

  # php session mmap socket
  /var/lib/php{,5,7,8}/session_mm_* rwlk,
  # file based session handler
  /var/lib/php{,5,7,8}/sess_* rwlk,
  /var/lib/php{,5,7,8}/sessions/* rwlk,