The minimum reproducer i have is this:
1) Fetch UC20 image from http://cdimage.ubuntu.com/ubuntu-core/20/edge/pending/
2) boot to grub cmdline prompt
2) execute
loopback loop (hd0,gpt3)/pc-kernel_502.snap
(or use tabcompletion for the right kernel snap)
Equivalent command on UC18 image (with bionic's grub) result in no
additional memory used, with the same kernel snap.
On UC20 image, executing that command uses up 400MB of RAM which does
not appear to be reclaimed.
It appears to be irrelevant as to what underlying fs type is (UC18 had
kernel snap on ext4, UC20 has it on ESP/fat).
** Changed in: grub2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1878541
Title:
Grub fails to load kernel from squashfs if mem < 1500mb
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