grub.cfg not updated during preupgrade

[Patrick O'Callaghan]

I recently upgraded F16->F17 using preupgrade. I booted into F17 and
everything seemed to work until I tried rebooting, whereupon I got a
Kernel panic with a lot of stuff about missing files (mdadm, sh,
cat, ...) and a panic backtrace. This was completely reproducible.

I then noticed that the running kernel was still
kernel-3.3.7-1.fc16.x86_64, despite the fact that
kernel-3.3.7-1.fc17.x86_64 had been installed by preupgrade, i.e.
grub.cfg had not been changed to reflect the new kernel. I updated to
F17 3.4 from updates-testing and the problem appears to have gone away,
i.e. grub is now correct.

So it looks like the issue was that grub.cfg should have been changed
during the preupgrade, but wasn't. Has anyone else seen this?

On a related note: how does one capture the console output when a panic
like this occurs? It isn't in any log files (maybe by this time there
isn't a filesystem) and it's a chore to have to copy it all by hand,
which is why I haven't bothered in this case.

poc