1. Launch vncserver on laptop, which generates X on :1.
2. From desktop, ssh -L 5905:localhost:5901 laptop.
3. On desktop, launch Remote Desktop Viewer or vncviewer against localhost:5.
4. In VNC session, when dialog appears to unlock keyring to access VPN secrets, crash in Xvnc.
I launched vncserver with the '-core' option, so I have a core file available. Compressed it's ~16 MB so I'm not attaching it here. Let me know if it would be helpful and I'll post it somewhere.
*** This bug has been marked as a duplicate of bug 585930 ***