[Bug 1878541] Re: Grub fails to load kernel from squashfs if mem < 1500mb

[Dimitri John Ledkov]

With unpacked kernel.efi boot to rdinit=/bin/sh res usage is 456756

so it feels as if (loop) device is not freed by grub / shim / firmware.

Next up is to try to play with things interactively in grub shell, to
try to figure out which commands cause memory to baloon.

Or like see if it can be freed after loading things from squashfs.

UC18 loads kernels from squashfs in under 512MB => compare if grub in
uc18 is better.

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https://bugs.launchpad.net/bugs/1878541

Title:
  Grub fails to load kernel from squashfs if mem < 1500mb

Status in snapd:
  New
Status in grub2 package in Ubuntu:
  New

Bug description:
  Booting a uc20 system fails early currently. The image used was:
  http://cdimage.ubuntu.com/ubuntu-core/20/beta/20200513.2/

  Attached is a screenshot of the debug output.

  This appears to be some sort of regression with grub in 20.04 or with
  UEFI grub - this used to work in uc18.

  Note that there is memory < 1500mb

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