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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