[Bug 1918265] Re: Random boot failure with Ubuntu 20.04 / grub 2.04 and Hyper-V 2012r2

[Lucas Navarezi]

We are currently facing the same problems with Linux Virtual Machines
running Ubuntu 18.04 and 20.04, both LTS releases.

Upon examining the Event Viewer on one of the Hosts machines, there's a
critical error message:

Event ID: 18602
Source: Hyper-V-Worker

<VM_NAME> has encountered a fatal error and a memory dump has been
generated. The guest operating system reported that it failed with the
following error code: 0x1E. If the problem persists, contact Product
Support for the guest operating system. (Virtual machine ID XXXXXXXX-
XXXX-XXXX-XXXX-XXXXXXXXXXXX)

These are some fixes we have tried so far:
   - Install linux-azure packages and kernel;
   - Enable Secure boot on Guest Machine;
   - Scan the disk for corruption;
   - Try different kernels.

We couldn't try other fixes like Updating the Hyper-V Server to 2019 or
disabling secure boot on Host machines, the reason being that we have
around 200 VMs across 8 Hosts.

Current configuration:
   - 2 Clusters;
   - 4 Hosts per cluster;
   - All hosts are running Hyper-V 2016.

Unfortunately, we are not the only ones with the issue, the bug also
affects Debian and RHEL distros:

https://access.redhat.com/solutions/4796261
https://docs.microsoft.com/en-us/answers/questions/530961/windows-server-2016-hyper-v-boot-error-w-virtual-s.html

These ones are the same:
https://docs.microsoft.com/en-us/answers/questions/52937/failure-to-boot-on-red-hat-enterprise-linux-rhel-o.html
https://social.technet.microsoft.com/Forums/en-US/1da1f987-52f0-4304-84f1-2c0ab52f3586/failure-to-boot-on-red-hat-enterprise-linux-rhel-or-centos-8-using-hyperv-2016?forum=linuxintegrationservices
https://social.technet.microsoft.com/Forums/en-US/3c48c962-a28d-44bb-bd80-5b7a902404d8/failure-to-boot-on-red-hat-enterprise-linux-rhel-or-centos-8-using-hyperv-2016?forum=winserverhyperv
https://www.reddit.com/r/HyperV/comments/hx2cps/failure_to_boot_on_red_hat_enterprise_linux_rhel/

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https://bugs.launchpad.net/bugs/1918265

Title:
  Random boot failure with Ubuntu 20.04 / grub 2.04 and Hyper-V 2012r2

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  We are experiencing some weird boot issues with Ubuntu 20.04 and
  Hyper-V 2012r2.

  In two cases the installation started successfully, as did the VM
  initial boot and then issues started to arise, where the boot process
  started to fail.

  grub start, the menu pop-up and then just after loading kernel and
  initrd (tried to put some echo(es) in the config the VM somehow reset
  and the menu pop-up back again.

  After a few of thoses either the VM shut-down or the boot is
  successfull, It seems completly random..

  Here it is captured on video:
    https://www.youtube.com/watch?v=5Bk3S-YGDZk

  If i setup a direct EFI-STUB boot of the kernel+initrd the boot
  process works every times.

  I suspected the "save_env/load_env" for a while but a stripped down
  grub.cfg give the same result..

  > insmod gzio
  > insmod part_gpt
  > insmod ext2
  > set root='hd0,gpt2'
  > if [ x$feature_platform_search_hint = xy ]; then
  >  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  94ebc17e-6aca-4e42-b489-b3eaa8a32d90
  > else
  >  search --no-floppy --fs-uuid --set=root 94ebc17e-6aca-4e42-b489-b3eaa8a32d90
  > fi
  > linux	/vmlinuz-5.8.0-44-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro nosplash elevator=noop 
  > initrd	/initrd.img-5.8.0-44-generic
  > boot

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