[Bug 90072] [feisty5] kcmshell crashes on closing following administrator mode

[Terrenius]

Public bug reported:

I have reproduced this numerous  times.  I go into System Settings, I open User Management, I enter Administrator Mode, I make changes.  I close User Management.  I hit the "X" in the upper right corner to close System Settings.  Window pops up and tells me that "kcmshell" has crashed and caused a signal 6 (SIGABRT)
I copied the backtrace.
It is a kubuntu install off of the herd 5 CD on a Dell XPS M1710 laptop with a Nvidia 7950GTX.  The only things I have installed are Beryl and Firefox.  Beryl was running the first time the problem occurred, but upon subsequent attempts at repetition it was not, even after a clean boot.

Let me know if there's anything else I can do for you.

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1233442592 (LWP 10030)]
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[KCrash handler]
#6  0xb7f1e410 in __kernel_vsyscall ()
#7  0xb7cccdf0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb7cce641 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb7cc643b in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
#10 0xb67f76f4 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
#11 0xb69c8c8c in ?? () from /usr/lib/libX11.so.6
#12 0x0805a9e0 in ?? ()
#13 0x0000011b in ?? ()
#14 0xb6a95000 in ?? ()
#15 0x00804d1c in ?? ()
#16 0xb6a6da4c in ?? () from /usr/lib/libX11.so.6
#17 0x0805a470 in ?? ()
#18 0xbf83611c in ?? ()
#19 0xb69a5225 in XFreeCursor () from /usr/lib/libX11.so.6
Backtrace stopped: frame did not save the PC

** Affects: kdebase (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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[feisty5] kcmshell crashes on closing following administrator mode
https://launchpad.net/bugs/90072