LVM boot failure with systemd-253

[Toolybird]

Describe the bug
Updating to systemd-253 causes boot failure when dracut is used to generate the initrd and the root volume is LVM.

Distribution used
Arch Linux

Dracut version
Arch is on dracut 056-1 but another user has tested the current dracut git with same result.

Init system
systemd

To Reproduce

• have LVM root volume
• install systemd-253
• regenerate initrd with dracut
• reboot

Expected behavior
Boot success.

Additional context
The offending systemd commit has been bisected. Please see:

systemd/systemd#26488

Additional context in this Arch bug report:

https://bugs.archlinux.org/task/77569

At this stage it seems like dracut is not coping with latest systemd changes. Thanks for any help.

[Toolybird]

It appears this issue will be fixed at the systemd level as a patch was produced over there. Sorry for the noise.

[Toolybird]

Reopening as the systemd devs seem to think dracut needs fixing anyway.

[LaszloGombos]

CC @aafeijoo-suse @teigland

[pvalena]

There's a good explanation here: systemd/systemd#26488 (comment)

Ideally the file would not be truncated & rewritten (by systemd and dracut as well), but then we'd need two files - is my understanding.

EDIT: the file cannot be simply created in the first place, due to sandboxing.

[lnykryn]

I think we should move generator_wait_for_dev to a cmdline hook. It is not the nicest solution, but logically it belongs there.

[johannbg]

@lnykryn it's more of an workaround not a solution and afaikt would only solve half the problem.

[aafeijoo-suse]

@lnykryn it's more of an workaround not a solution and afaikt would only solve half the problem.

Why is not a solution to only move the part of generator_wait_for_dev that creates the hooks to a cmdline script, as @lnykryn proposes? the crypt module does the same thing:

dracut/modules.d/90crypt/parse-crypt.sh

Lines 169 to 174 in aca5120

	printf -- '[ -e /dev/disk/by-id/dm-uuid-CRYPT-LUKS?-*%s*-* ] || exit 1\n' "$uuid" \
	>> "$hookdir/initqueue/finished/90-crypt.sh"
	{
	printf -- '[ -e /dev/disk/by-uuid/*%s* ] || ' "$luksid"
	printf -- 'warn "crypto LUKS UUID "%s" not found"\n' "$luksid"
	} >> "$hookdir/emergency/90-crypt.sh"

The only missing part would be how to know from the cmdline hook the directory that systemd passes to generators (i.e. usually /run/systemd/generator), but we can hardcode it for now.

[aafeijoo-suse]

This issue will affect openSUSE Tumbleweed soon, systemd will be updated from v252.6 to v253.1 and it will not carry the Fedora workaround, so I'd like to have the dracut upstream fix agreed. @lnykryn I tried your proposal and it seems to work fine (#2225 is fixed). Do you plan to submit a PR? If not, I can send it.

[lnykryn]

@aafeijoo-suse Please file the PR.