Bug 2222422

Summary:	systemd-fsck-root.service fails on boot due to unsupported feature: FEATURE_C12
Product:	[Fedora] Fedora	Reporter:	Paul Whalen <pwhalen>
Component:	e2fsprogs	Assignee:	Lukáš Czerner <lczerner>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	38	CC:	esandeen, josef, kasal, kzak, lczerner
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OS:	Linux
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Last Closed:	2023-07-12 17:58:22 UTC	Type:	---
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Description Paul Whalen 2023-07-12 17:09:31 UTC

Rebasing a Fedora IoT installation from 39 -> 38 fails to boot and drops to dracut with the error:

/dev/mapper/fedora--iot-root has unsupported feature(s): FEATURE_C12
e2fsck: Get a newer version of e2fsck!


Reproducible: Always

Steps to Reproduce:
1. Boot Fedora 39 and rebase to Fedora 38
2. Boot fails and drops to an emergency shell
3. run 'systemctl status systemd-fsck-root'
Actual Results:  
/dev/mapper/fedora--iot-root has unsupported feature(s): FEATURE_C12
e2fsck: Get a newer version of e2fsck!

Expected Results:  
Booted system

Booting with "fsck.mode=skip" works as expected.

Comment 1 Eric Sandeen 2023-07-12 17:42:46 UTC

What does "Boot Fedora 39 and rebase to Fedora 38" mean - downgrade? I did not know that was possible, but if you did, it's not a bug that older package cannot process newer disk formats.

Can you please explain what the "rebase" action is?

Based on Ted's reply in a Debian bug report, "FEATURE_C12 is the orphan_file feature which is only going to be enabled by default in e2fsprogs 1.47.0"

If you create a filesystem with a newer e2fsprogs, and it creates new on-disk features that older e2fsprogs cannot handle, that would not be considered a bug.

Comment 2 Paul Whalen 2023-07-12 17:58:22 UTC

(In reply to Eric Sandeen from comment #1)
> What does "Boot Fedora 39 and rebase to Fedora 38" mean - downgrade? I did
> not know that was possible, but if you did, it's not a bug that older
> package cannot process newer disk formats.
> 
> Can you please explain what the "rebase" action is?

A downgrade on ostree based systems, apologies for not being clear. This is a test 
run in OpenQA in Fedora.

> 
> Based on Ted's reply in a Debian bug report, "FEATURE_C12 is the orphan_file
> feature which is only going to be enabled by default in e2fsprogs 1.47.0"
> 
> If you create a filesystem with a newer e2fsprogs, and it creates new
> on-disk features that older e2fsprogs cannot handle, that would not be
> considered a bug.

Understood, closing.