Qtparted does still hangs in 0.4.5-2ubuntu12 on kubuntu feisty (but so
far I haven't found a way to reproduce a crash anymore). Procedure to
hang the program is still the same:

- Start qtparted with a usb disk attached, wait forl the program to load
- Remove/detach usb disk from the system

- Select the entry for the removed disk in the list. A progress dialog appears, 
and above that an error dialog saying "Critical error during ped_disk_new" (or 
so).
- Click OK on the error dialog, select another drive; then go back to the 
removed one again; repeat until the program hangs (usually takes two tries but 
may take more).

When it hangs the program is showing a dialog giving "Progress"
information on "Current operation: scanning all disk partitions." At
this point qtparted has become unresponsive and uses 100% of cpu until
killed.

command line output:
# qtparted
Error: Error opening /dev/sde: No such file or directory
A bug has been detected in GNU Parted.  Refer to the web site of parted 
http://www.gnu.org/software/parted/parted.html for more informations of what 
could be useful for bug submitting!  Please email a bug report to [EMAIL 
PROTECTED] containing at least the version (1.7.1) and the following message:  
Assertion (disk != NULL) at ../../libparted/disk.c:1319 in function 
ped_disk_next_partition() failed.
Error: Error opening /dev/sde: No such file or directory
Error: Can't have overlapping partitions.

-- 
qtparted hangs or crashes upon trying to access removed usb drive
https://bugs.launchpad.net/bugs/55398
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