switch to zstd by default breaks booting focal LTS kernel
Bug #1941649 reported by
dann frazier
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| initramfs-tools (Ubuntu) |
Expired
|
Undecided
|
Unassigned | ||
Bug Description
While trying to track down a behavior difference between focal and impish, I installed focal's kernel in an impish userspace and attempted to boot it. The boot failed, unable to find root. While GRUB reported that it had loaded the initramfs, no initramfs messages were emitted during boot. I tracked this down to initramfs-tools having switched to use zstd compression by default. zstd decompression does not appear to be supported by the LTS 5.4 kernel - it appears to have been added upstream in v5.9. I imagine this is likely to cause problems with partial-upgrade scenarios.
Revision history for this message
| Dimitri John Ledkov (xnox) wrote | #1 |
| Changed in initramfs-tools (Ubuntu): | |
| status: | New → Incomplete |
Revision history for this message
| Launchpad Janitor (janitor) wrote | #2 |
| Changed in initramfs-tools (Ubuntu): | |
| status: | Incomplete → Expired |
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partial upgrades are not supported, and during upgrades we generally do not recreate initrds for old kernels.
Meaning one should have at least .old kernel+initrd pair bootable.
It is more of linux bug maybe that v5.4 does not support zstd compressed initrd?