Public bug reported:

When I suspend my laptop while running under Xen, I cannot resume the
session later on.

If I open my laptop again i will just see a black screen, and then my
BIOS vendor a couple of seconds later, indicating that Xen crashed.

This is 100% reproducible.

I'm ready to give you more information if you tell me where to look for.

informations:
kernel: 4.15.0-32-generic

lsb_release
Description:    Ubuntu 18.04 LTS
Release:        18.04

apt-cache policy xen-hypervisor-4.9-amd64
xen-hypervisor-4.9-amd64:
  Installed: 4.9.2-0ubuntu1
  Candidate: 4.9.2-0ubuntu1
  Version table:
 *** 4.9.2-0ubuntu1 500
        500 http://fi.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Description changed:

  When I suspend my laptop while running under Xen, I cannot resume the
  session later on.
  
  If I open my laptop again i will just see a black screen, and then my
  BIOS vendor a couple of seconds later, indicating that Xen crashed.
  
+ This is 100% reproducible.
+ 
  I'm ready to give you more information if you tell me where to look for.
  
  informations:
- kernel: 4.15.0-22-generic
+ kernel: 4.15.0-32-generic
  
  lsb_release
  Description:  Ubuntu 18.04 LTS
  Release:      18.04
  
  apt-cache policy xen-hypervisor-4.9-amd64
  xen-hypervisor-4.9-amd64:
-   Installed: 4.9.2-0ubuntu1
-   Candidate: 4.9.2-0ubuntu1
-   Version table:
-  *** 4.9.2-0ubuntu1 500
-         500 http://fi.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
-         100 /var/lib/dpkg/status
+   Installed: 4.9.2-0ubuntu1
+   Candidate: 4.9.2-0ubuntu1
+   Version table:
+  *** 4.9.2-0ubuntu1 500
+         500 http://fi.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
+         100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/1788499

Title:
  xen crashes on system resume

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