FCOS VM (Bhyve on TrueNAS) failing to boot after automatic update ("systemd[1]: Freezing execution")

[leosum]

Hi all,
this morning my FCOS VM was down. I think zincati ran an update.

Upon manually rebooting it, I get the following output via VNC:

At that stage it hangs.
I think the relevant line is

systemd[1]: Freezing execution

Any idea how I can repair this?

The FCOS VM is a bhyve guest on a FreeBSD (TrueNAS) Host. The guest filesystem resides in a Zvol.

[siosm (Timothée Ravier)]

Can you file a bug on the tracker with the console logs? GitHub - coreos/fedora-coreos-tracker: Issue tracker for Fedora CoreOS

Can you also try booting a fresh Fedora CoreOS VM to see if this is a general issue with Fedora 41 on Bhyve?

[leosum]

Hi Timothée,
thank you for your answer.

It was indeed due to an update to 41. Reverting to 40 brought the vm back to life:

I will file that bug report and try a second fresh vm on bhyve tomorrow and report back.

[leosum]

Here’s the bug report:

FCOS VM (Bhyve on TrueNAS) failing to boot after automatic update to Fedora 41 (“systemd[1]: Freezing execution”)

[leosum]

So it looks like I am on cgroups v1 and F41 requires v2.

How would I go about switching to v2 without re-ignitioning?

[leosum]

running

sudo rpm-ostree kargs --delete=systemd.unified_cgroup_hierarchy --reboot

seems to successfully switch to v2.

After reenabling zincati, the system automatically reboots and updates to F41.
All good. Thank you!