Closing Disk Utility while formatting frezzes up entire computer

I see that when formatting a disk, Disk utility is not intrusive enough in the way it display that it is creating a file-system. Currently it is just a little circle in the bottom-right of the partition. A user who can't see this may think that it is OK to quit the application. Disk Utility should not allow quitting (besides kill -9) while it is working with a filesystem.

I wanted to try this to see if it would break and it does:
Open Disk Utility
Select a disk and format a partititon
Close Disk Utility while formatting

Expected:
Warning: You cannot quit disk utility while there is still an pending action.
Details > You are currently formatting /dev/sdb1

What actually happened:
Screen become gray
Force quit dialog showed up
Entire PC froze (no mouse movement)

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-disk-utility 3.0.2-1ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Mon Sep 5 09:52:16 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110817)
SourcePackage: gnome-disk-utility
UpgradeStatus: Upgraded to oneiric on 2011-08-27 (8 days ago)