Xephyr doesn't work when guest additions are installed

[Maakuth]

Binary package hint: virtualbox-ose-guest-x11

Both with VirtualBox OSE guest additions and with the non-free ones shipping with VirtualBox, xserver-xephyr doesn't work, but fail with an assert:

$ Xephyr :2
Xephyr: ../../../../include/privates.h:122: dixGetPrivateAddr: Assertion `key->initialized' failed.

First I thought the problem was with Xephyr itself, but it seems to work fine natively and also in VirtualBox when there is no guest additions installed.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: virtualbox-ose-guest-x11 3.2.8-dfsg-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Wed Nov 10 18:13:30 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANG=fi_FI.utf8
 SHELL=/bin/bash
SourcePackage: virtualbox-ose

[Maakuth (markus-vuorio)]

I also tried it with AMD64 Maverick, and it behaves the same - works without guest additions, but doesn't work with them.

[Maakuth (markus-vuorio)]

With Lucid it works, both with Ubuntu and Oracle Guest Additions.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Frederic Plourde (fredinfinite23)]

Any news on that ? We're having troubles with some glx extensions under Xephyr with VirtualBox Guest additions turned on.