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

[Dimitri John Ledkov]

Ideally, we'd want to bisect and fix the kernel itself to reliably
shutdown. yanking ahci sounds like a large hammer. Invalidating systemd
task, and pinging kernely people.

** Changed in: systemd (Ubuntu)
       Status: Incomplete => Invalid

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

Status in dellserver:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Incomplete

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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