sd-umount: Failed to unmount /oldroot

Just by chance I saw that my PC throws errors incl. kernel panic whenever I shutdown the PC. There is no trace in the logs. But I have pictures:

So far I did not experience any negative impact, but it scares me.

I do not know if this is a kernel bug or a systemd bug. I found some info on the web. Some of which proposed to add the "shutdown" HOOK to/etc/mkinitcpio.conf etc. . I did that. But it did not help.

Any idea what is going on here?

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Maybe some job on shutdown. Check your services for a shutdown target.
Also try other kernels and/or fallback image.

I said: there is no trace in the logs. It happens at the very end of the shutdown process and powering off a second later. The last entries in the journal are:

Sep 10 17:57:05 rakete systemd[1]: Reached target Power-Off.
Sep 10 17:57:05 rakete systemd[1]: Shutting down.
Sep 10 17:57:05 rakete kernel: printk: systemd-shutdow: 57 output lines suppressed due to ratelimiting
Sep 10 17:57:05 rakete systemd-shutdown[1]: Syncing filesystems and block devices.
Sep 10 17:57:05 rakete systemd-shutdown[1]: Sending SIGTERM to remaining processes...
Sep 10 17:57:05 rakete haveged[459]: haveged: Stopping due to signal 15
Sep 10 17:57:05 rakete haveged[459]: haveged starting up
Sep 10 17:57:05 rakete systemd-journald[460]: Journal stopped

Any external drives?

Just giving ideas...

No external drives. And I believe this issue is new. I will try kernel 4.19 and see....

It is definitely a systemd issue!

With kernel 4.19 I get the same three lines of error like in the first image but no kernel panic.

But when I downgrade systemd the issue is gone.

It was this update in testing that caused the issue:

[2019-09-06 22:31] [ALPM] upgraded systemd-libs (242.85-2 -> 243.0-2)
[2019-09-06 22:31] [ALPM] upgraded systemd (242.85-2 -> 243.0-2)
[2019-09-06 22:33] [ALPM] upgraded systemd-resolvconf (242.85-2 -> 243.0-2)
[2019-09-06 22:33] [ALPM] upgraded systemd-sysvcompat (242.85-2 -> 243.0-2)

Downgrading solved it:

[2019-09-10 18:53] [ALPM] downgraded systemd (243.0-2 -> 242.85-2)
[2019-09-10 18:54] [ALPM] downgraded systemd-libs (243.0-2 -> 242.85-2)
[2019-09-10 18:55] [ALPM] downgraded systemd-resolvconf (243.0-2 -> 242.85-2)
[2019-09-10 18:55] [ALPM] downgraded systemd-sysvcompat (243.0-2 -> 242.85-2)

@philm
I do not recommend to push systemd 243.0-2 to stable.

UPDATE:

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Noticed this too, but i think the issue is solved with the 243.9-1 currently in unstable.

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I see I'm not the only one. But I only get the 2 sd-umount errors, I don't get a kernel panic or whatever that mess is in the 2nd picture, probably cause I'm on stable...

Yep I noticed it on my fresh install of Architect Testing this weekend. Forgot to report it.

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