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[PurpleFool <tb@xxxxxxxxxxxxxxxxx>]

Don't you hate inaccurate bug titles?

Some further poking round has determined that the it's not the vncviewer
that causes the problem but the xdpyinfo used to see of the server
started.  To reproduce the issue it was sufficient for me to use:

$ Xephyr -host-cursor :20 &
$ xdpyinfo -display :20
...

  visual:
    visual id:    0x51
    class:    TrueColor
    depth:    32 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits

Backtrace:
0: Xephyr (xorg_backtrace+0x28) [0x57ebb8]
1: Xephyr (0x400000+0x1827cd) [0x5827cd]
2: /lib/libpthread.so.0 (0x7f4e82fda000+0xf8f0) [0x7f4e82fe98f0]
Segmentation fault at address (nil)

-- 
NULL deref in __restore_rt when attempting to start vncviewer
https://bugs.launchpad.net/bugs/596328
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