I create a (minimal) livecd, run livecd-iso-to-pxeboot on it, and copy the vmlinuz0 and initrd0.img to our PXE server, along with the flags from pxelinux.cfg

When I try to boot a computer off of the pxe image, the last thing I see on the screen is "creating devices", and then:

mount: Could not find any loop device. Maybe this kernel does not know
       about the loop device? (If so, recompile or `modprobe loop'.)

At this point it drops me to an emergency shell.

If I modify /sbin/real-init like this:

@@hand-made diff - don't try to apply@@
    echo "creating devices"
 fi
 /sbin/udevadm trigger
+/bin/sleep 5
 
 if [ "$shell" == "1" ] ; then
     plymouth --hide-splash || :
@@

everything works fine (though I have a five-second delay on boot).  Obviously, /dev/loop* aren't being created by udev in time for the mount command without the five-second delay.

After some more poking around, I replaced /bin/sleep 5 with:
/sbin/udevadm settle

and it fixed the problem.  Not sure why this hasn't come up before.

Version-Release number of selected component (if applicable):
livecd-tools-024-1.fc11.x86_64

How reproducible:
Always