[Bug 1851311] Re: loopback command hangs in 2.04 under UEFI

[Alkis Georgopoulos]

I started testing binaries from the release history page:
https://launchpad.net/ubuntu/+source/grub2-signed/+publishinghistory

The last working one is:
https://launchpad.net/ubuntu/+source/grub2-signed/1.116
https://launchpad.net/ubuntu/+source/grub2-signed/1.116/+build/17166212/+files/grub-efi-amd64-signed_1.116+2.02+dfsg1-12ubuntu3_amd64.deb

The first broken one is:
https://launchpad.net/ubuntu/+source/grub2-signed/1.117
https://launchpad.net/ubuntu/+source/grub2-signed/1.117/+build/17277557/+files/grub-efi-amd64-signed_1.117+2.04-1ubuntu1_amd64.deb

So indeed 2.02 works and 2.04 doesn't.
I will check if the problem affects other distributions as well.

** Summary changed:

- Grub 2.04 Out of memory error, No server error
+ loopback command hangs in 2.04 under UEFI

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1851311

Title:
  loopback command hangs in 2.04 under UEFI

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Trying to loop mount ISO.

  Installed grub 2.04 to flash drive in UEFI mode from 19.10
  Flash drive does not boot and gives Out of memory error & no server error. Must load kernel first.

  Re-installed grub from 18.04 to same flash drive using same boot stanza.
  Booted without issue.

  From 18.04
  fred at Bionic-Z170N:~$ grub-install -V
  grub-install (GRUB) 2.02-2ubuntu8.13

  from 19.10
  fred at fred-Z170N-eoan:~$ grub-install -V
  grub-install (GRUB) 2.04-1ubuntu12

  Boot stanza that works in 2.02 but not in 2.04

  menuentry "Focal Live ISO" {
  set isofile="/ISO/focal-desktop-amd64.iso"
  loopback loop (hd0,1)$isofile
      linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile toram noeject
      initrd (loop)/casper/initrd
  }

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