** Changed in: linux (Ubuntu Eoan)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1851810
Title:
Some EFI systems fail to boot in efi_init() when booted via maas
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Disco:
Fix Committed
Status in linux source package in Eoan:
Fix Committed
Status in linux source package in Focal:
In Progress
Bug description:
[Impact]
Cirtain EFI systems will no longer boot with updated versions of maas.
They will still boot in BIOS compatibility mode where available.
[Test Case]
Affected systems have already been tested with this fix applied and
now boot successfully in EFI mode. The key test is does any EFI based
system boot with this applied.
[Regression Potential]
The change increased the headroom by a very small amount, an
additional 8 slots. This is very unlikely to lead to additional
failures.
===
When booting via newer versions of maas we use grub extensions to load
additional files. This leads the kernel to panic in efi_main():
exit_boot() failed!
efi_main() failed!
This occurs because the EFI memory map is more fragmented. When we
exit boot services that returns an updated memory map in a buffer we
supply. This has to be large enough to contain the updated map. If
the exit fails because of lack of map space we are dead in the water
because the call to allocate memory is lost to us. We therefore add
some headroom in the allocation to allow for any expansion during
close. This headroom is insufficient.
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