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

[Dimitri John Ledkov]

Could you please download and install
https://launchpad.net/ubuntu/+source/finalrd/3/+build/15227702/+files/finalrd_3_all.deb

(this is a link from
https://launchpad.net/ubuntu/+source/finalrd/3/+build/15227702 )

And check if that helps with reboots? This should perform pivot-root
from rootfs to initramfs, and generally improve shutdown reliability.

However, I do suspect this to be a kernel issue. If ahci is really
identified as a kernel shutdown culprit, we might want to ship an
executable script in /lib/systemd/system-shutdown/yank-modules.sh or
somesuch which would rmmod ahci if possible.

So far I do not have any indications that it is indeed systemd holding
up reboot, and not the kernel.

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

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:
  Incomplete
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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