Fedora 27 kernel updates make system unbootable (sort of)

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I'm trying to pin down what exposed this bug:

  https://bugzilla.redhat.com/show_bug.cgi?id=1569970

The immediate trigger seems to be that all shutdowns on my system leave the XFS root file system in an unclean state, so that GRUB cannot read recently written files under /boot (assuming that /boot is on the same file system).

Since GRUB does not deal with the XFS journal, the effect is that the system is unbootable until you mount / and trigger journal recovery, after which everything is fine again (because the files in /boot are only written to rarely).

Any ideas what could cause this, and how to debug this further? It's clearly GRUB's fault that it cannot read the XFS journal, but the consistently unclean shutdowns probably have been caused by a kernel or systemd change, or maybe something else entirely.

Thanks,
Florian
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