Comment 45 for bug 8058

I have got /boot in an xfs partition and have been able to install grub.

The grub-install script did not complete and stayed in a D+ mode as reported by ps.
This seemed to be caused by the xfs_freeze performed
if xfs_freeze -f ${grubdir} ; then xfs_frozen=true ; fi

My workaround was to run the following from a console window:
sudo xfs_freeze -u /boot

Then the grub_install completed successfully, and grub has worked perfectly since.