Ok so the dirty file system problem always happens with all pk offline
updates on Fedora using either ext4 or XFS with any layout; and it's
easy to reproduce.

1. Clean install any version of Fedora, defaults.
2. Once Gnome Software gives notification of updates, Restart & Install
3. System reboots, updates are applied, system reboots again.
4. Now check the journal filtering for 'fsck' and you'll see it
replayed the journals; if using XFS check the filter for "XFS" and
you'll see the kernel did journal replace at mount time.

Basically systemd is rebooting even though the remoun-ro fails
multiple times, due to plymouth running off root fs and being exempt
from being killed, and then reboots anyway, leaving the file system
dirty. So it seems like a flaw to me to allow an indefinite exemption
from killing a process that's holding a volume rw, preventing
remount-ro before reboot.

So there's a risk that in other configurations this makes either ext4
and XFS systems unbootable following an offline update.

Chris Murphy
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