Also getting this bug (Ubutu 12.04 - KDE 4.8.5). I usually get by using the 
following:
1. Lazy unmount of the problematic mount point (sudo umount -l /mnt/mountpoint).
2. Restart plasma : killall plasma-desktop && plasma-desktop That allows the 
panel to unfreeze. Unfortunately, it also pollutes the notification area with 
lots of spurious notification entries, resulting in a smaller (width-speaking) 
taskbar/paenl. I have to manually hide those to get back to the actual panel 
width (see screenshot).

Is there something we can do to help as users (getting backtraces, etc)
so that this problem is fixed?

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https://bugs.launchpad.net/bugs/406154

Title:
  [karmic] plasma panel freezes for a few seconds when opening a usb
  drive

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