[Bug 1840686] Re: Xenial images won't reboot if disk size is > 2TB when using GPT

[Matthew Ruffell]

I have built a test package for grub2, which is available here:
https://launchpad.net/~mruffell/+archive/ubuntu/lp1840686-test

It contains
http://git.savannah.gnu.org/cgit/grub.git/commit/?id=e20aa39ea4298011ba716087713cff26c6c52006
mentioned in comment #4.

I did the following to test that the test package fixes the problem:

1) gcloud compute instances create test-3072-xenial --image daily-ubuntu-1604-xenial-v20190731 --image-project ubuntu-os-cloud-devel --boot-disk-size 3072
2) sudo add-apt-repository ppa:mruffell/lp1840686-test
3) sudo apt-get update
4) sudo apt remove grub-common grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub-pc-bin grub2-common
5) sudo apt install grub-common grub-efi-amd64 grub-efi-amd64-bin grub-pc-bin grub2-common
6) sudo grub-install /dev/sda
7) sudo reboot

The instance started like normal and you can connect to it.

** Changed in: grub (Ubuntu Xenial)
     Assignee: (unassigned) => Matthew Ruffell (mruffell)

** Changed in: grub (Ubuntu Xenial)
       Status: Triaged => In Progress

** Tags added: sts

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Title:
  Xenial images won't reboot if disk size is > 2TB when using GPT

Status in cloud-init:
  Won't Fix
Status in grub package in Ubuntu:
  Fix Released
Status in grub source package in Xenial:
  In Progress

Bug description:
  CPC team has recently converted Xenial images to use GPT instead of
  MBR.  However, after booting an instance that has a disk size of 2049
  GB or higher, we hang on the next subsequent boot (Logs indicate it
  hanging on "Booting Hard Disk 0".

  This works on Bionic, but what makes it strange is that they have the
  same kernel revision - 4.15.0-1-37.

  patrick_viafore at patviafore-test-3072-xenial:~$ lsb_release -rd
  Description:    Ubuntu 16.04.6 LTS
  Release:        16.04
  patrick_viafore at patviafore-test-3072-xenial:~$ sudo dpkg -l | grep linux-gcp
  ii  linux-gcp                        4.15.0.1037.51                                amd64        Complete Google Cloud Platform (GCP) Linux kernel and headers
  ii  linux-gcp-headers-4.15.0-1037    4.15.0-1037.39~16.04.1                        amd64        Header files related to Linux kernel version 4.15.0

  To reproduce:

  1) Create an image with a disk size of 3072 using a serial that has GPT
  gcloud compute instances create test-3072-xenial --image daily-ubuntu-1604-xenial-v20190731 --image-project ubuntu-os-cloud-devel --boot-disk-size 3072

  Reboot the instance

  2) It will hang on reboot and you cannot connect

  3) Please note that later serials have the GPT change reverted.

  You can replace xenial with bionic in the above commands to get a
  bionic instance instead.

  To test this out in a more slower fashion:

  1) Create an image with a disk size of 2048 using a serial that has GPT
  gcloud compute instances create test-2048-xenial --image daily-ubuntu-1604-xenial-v20190731 --image-project ubuntu-os-cloud-devel --boot-disk-size 2048

  2) Resize the disk to 3072

  3) Issue growpart /dev/sda 1

  4) Issue resize2fs /dev/sda1

  5) Issue rsize2fs /dev/sda1 again

  On the second resize2fs, it tries to resize again, but on a working
  instance, it says there's nothing to resize.

  I've tried starting from a Xenial instance and doing a do-release-
  upgrade to get to bionic and then doing the growpart/resize2fs, but
  the issue still shows up.

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