[Bug 1777674] [NEW] Ubuntu 18.04 hangs at "kvm: exiting hardware virtualization" on AMD servers

[Sujith Pandel]

Public bug reported:

Ubuntu 18.04 hangs at "kvm: exiting hardware virtualization" on AMD
servers when under graceful reboot stress for 12hrs.

* This hand is observed only when Onboard SATA DVD Drive is connected.

* Not seen with Ubuntu 16.04.4 (HWE kernel v4.13)

* Seen with Ubuntu 18.04 (4.15.0-23-generic, 4.15.0-20-generic)

Steps:
Setup a DellEMC AMD server with Onboard DVD Drive, install Ubuntu 18.04 and start reboot stress
After a few reboots, observe that the machine hangs at "kvm: exiting hardware virtualization" and does not proceed with reboot cycles.

Only physical reset helps in continuing the reboot test.

** Affects: dellserver
     Importance: Undecided
         Status: New

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

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

** Attachment added: "console-logs"
   https://bugs.launchpad.net/bugs/1777674/+attachment/5154314/+files/console-logs.txt

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1777674

Title:
  Ubuntu 18.04 hangs at "kvm: exiting hardware virtualization" on AMD
  servers

Status in dellserver:
  New
Status in linux package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04 hangs at "kvm: exiting hardware virtualization" on AMD
  servers when under graceful reboot stress for 12hrs.

  * This hand is observed only when Onboard SATA DVD Drive is connected.

  * Not seen with Ubuntu 16.04.4 (HWE kernel v4.13)

  * Seen with Ubuntu 18.04 (4.15.0-23-generic, 4.15.0-20-generic)

  Steps:
  Setup a DellEMC AMD server with Onboard DVD Drive, install Ubuntu 18.04 and start reboot stress
  After a few reboots, observe that the machine hangs at "kvm: exiting hardware virtualization" and does not proceed with reboot cycles.

  Only physical reset helps in continuing the reboot test.

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