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apport-collect 1777420

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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1777420

Title:
  Login loop after inactivity in login screen

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have Kubuntu 18.04 installed with /home/$USER directory using
  ecryptfs. As a display manager I use standard sddm and sddm-locker. If
  I leave my PC for a weekend powered on and locked then I'm unable to
  log in on monday.

  When I enter correct password in sddm - it prints that I entered
  incorrect password. If I switch to any virtual terminal and try to
  login there I'm immediately thrown out of session back to login
  prompt. That's what I see in logs:

  auth.log:
  Jun 18 12:59:55 yanPC login[14123]: pam_ecryptfs: Passphrase file wrapped
  Jun 18 12:59:56 yanPC login[14031]: pam_unix(login:session): session opened 
for user yan by LOGIN(uid=0)
  Jun 18 12:59:56 yanPC systemd-logind[770]: New session 1757 of user yan. 
  Jun 18 12:59:56 yanPC login[14031]: pam_ecryptfs: Error setting up private 
mount
  Jun 18 12:59:56 yanPC login[14031]: pam_unix(login:session): session closed 
for user yan
  Jun 18 12:59:56 yanPC login[14031]: pam_ecryptfs: Error setting up private 
mount
  Jun 18 12:59:56 yanPC systemd-logind[770]: Removed session 1757.

  syslog:
  Jun 18 12:59:56 yanPC systemd[1]: Started Session 1757 of user yan. 
  Jun 18 12:59:56 yanPC kernel: [870285.302824] cgroup: fork rejected by pids 
controller in /user.slice/user-1000.slice/session-1757.scope
  Jun 18 12:59:56 yanPC systemd[1]: getty@tty3.service: Service has no hold-off 
time, scheduling restart.
  Jun 18 12:59:56 yanPC systemd[1]: getty@tty3.service: Scheduled restart job, 
restart counter is at 12.
  Jun 18 12:59:56 yanPC systemd[1]: Stopped Getty on tty3.
  Jun 18 12:59:56 yanPC systemd[1]: Started Getty on tty3.

  
  kern.log:
  Jun 18 12:59:26 yanPC kernel: [870256.029760] cgroup: fork rejected by pids 
controller in /user.slice/user-1000.slice/session-1756.scope
  Jun 18 12:59:56 yanPC kernel: [870285.302824] cgroup: fork rejected by pids 
controller in /user.slice/user-1000.slice/session-1757.scope

  
  If I login as root from virtual terminal and systemctl restart sddm.service 
then I'm able to login from anywhere.

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