Hi Daniel,
In my understanding, the crash is not reproducible after my workaround 
(switching to the nvidia driver), because the nvidia-resume.service is not 
masked (my theory).

Therefore, I switched back to the Nouveau driver, and I reproduced the
problem and collected the system logs as you asked. Now prevboot.txt
contains the logs from a clean boot, through the session crash and ends
with a (user requested) reboot.

Just for the record, these are the steps to reproduce the bug:

 1. Install Ubuntu 21.10 on a laptop(?) with an nvidia GPU
 2. Open "Software & Updates" -> "Additional Drivers"
 3. Select the latest driver (470)
 4. Reboot
 5. Login normally on GDM
 6. Open "Software & Updates" -> "Additional Drivers"
 7. Select "Nouveau display driver" and apply the changes
 8. Reboot
 9. Login normally on GDM
10. Try to suspend the system
11. You should observe a session crash here


** Attachment added: "System journal for the previous boot, as requested in 
update #8"
   
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1950393/+attachment/5540130/+files/prevboot.txt

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https://bugs.launchpad.net/bugs/1950393

Title:
  GDM session crashes on suspend on Ubuntu 21.10

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