[Bug 1957711] [NEW] Switching users causes system crash

[GB]

Public bug reported:

Ubuntu 21.10

gdm3:
  Installed: 41~rc-0ubuntu2
  Candidate: 41~rc-0ubuntu2
  Version table:
 *** 41~rc-0ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu impish/main amd64 Packages
        100 /var/lib/dpkg/status

Steps to reproduce:

1. Log in as any user
2. In the top right of the screen, click the power icon (⏻)
3. Select [Power Off/Log Out]
4. Select [Switch User]
5. Select any user that is NOT the user which is still currently logged in
6. Operating system is now frozen, mouse and keyboard don't respond, and user is never logged in.
7. Pressing [CTRL] + [ALT] + [DEL] appears to cause the system to crash

Apport.log: https://pastebin.com/srFwgfAh

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Crash log"
   https://bugs.launchpad.net/bugs/1957711/+attachment/5553637/+files/gdm3.0.crash

** Package changed: apport (Ubuntu) => gdm3 (Ubuntu)

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https://bugs.launchpad.net/bugs/1957711

Title:
  Switching users causes system crash

Status in gdm3 package in Ubuntu:
  New

Bug description:
  Ubuntu 21.10

  gdm3:
    Installed: 41~rc-0ubuntu2
    Candidate: 41~rc-0ubuntu2
    Version table:
   *** 41~rc-0ubuntu2 500
          500 http://us.archive.ubuntu.com/ubuntu impish/main amd64 Packages
          100 /var/lib/dpkg/status

  Steps to reproduce:

  1. Log in as any user
  2. In the top right of the screen, click the power icon (⏻)
  3. Select [Power Off/Log Out]
  4. Select [Switch User]
  5. Select any user that is NOT the user which is still currently logged in
  6. Operating system is now frozen, mouse and keyboard don't respond, and user is never logged in.
  7. Pressing [CTRL] + [ALT] + [DEL] appears to cause the system to crash

  Apport.log: https://pastebin.com/srFwgfAh

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