Xorg seg faults after logout from WM

[Corrin Meyer]

I have recently installed Arch Linux under VirtualBox running on a Windows 7
host machine.  I started with a base install and then installed, in order,
Xorg, KDE, and the VirtualBox guest additions (as packaged by Arch).  When
logging out of KDE, Xorg seg faults.  Below is a portion of the Xorg log
file.

[    19.777] (II) Module vboxmouse: vendor="Oracle Corporation"
[    19.777] compiled for 0.0.0, module version = 1.0.0
[    19.777] Module class: X.Org XInput Driver
[    19.777] ABI class: X.Org XInput driver, version 9.0
[    19.777] (**) Load address of symbol "VBOXMOUSE" is 0xb5f5a940
[    19.777] (**) (unnamed): always reports core events
[    19.777] (**) (unnamed): Device: "/dev/vboxguest"
[    19.777] (II) XINPUT: Adding extended input device "(unnamed)" (type:
MOUSE)
[    19.777] (**) (unnamed): (accel) keeping acceleration scheme 1
[    19.777] (**) (unnamed): (accel) acceleration profile 0
[    19.777] (**) (unnamed): (accel) acceleration factor: 2.000
[    19.777] (**) (unnamed): (accel) acceleration threshold: 4
[    19.777] (II) (unnamed): On.
[    69.839]
Backtrace:
[    69.839] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80df05b]
[    69.839] 1: /usr/bin/X (0x8048000+0x63da5) [0x80abda5]
[    69.839] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb781c40c]
[    69.839] 3: /usr/bin/X (0x8048000+0x214d0) [0x80694d0]
[    69.839] 4: /usr/bin/X (0x8048000+0x1a4b5) [0x80624b5]
[    69.839] 5: /lib/libc.so.6 (__libc_start_main+0xe6) [0xb7560c76]
[    69.839] 6: /usr/bin/X (0x8048000+0x1a0a1) [0x80620a1]
[    69.839] Segmentation fault at address 0x6d
[    69.839]
Fatal server error:
[    69.839] Caught signal 11 (Segmentation fault). Server aborting
[    69.839]
[    69.839]
Please consult the The X.Org Foundation support
 at http://wiki.x.org
 for help.
[    69.839] Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[    69.839]

I have a feeling that I need to perform additional configuration but I don't
know for sure.  Has anyone else experienced a similar issue?

- cjmeyer

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