VBoxSVC crashed with SIGSEGV

I was reverting a VM (debian testing) back to a snapshot when this crash happened.
The machine was then displayed as inaccessible in the gui.
After restart of the virtualbox gui the machine was displayed as accessible again and appears to be working but the revert was not executed.
Another attempt at reverting was successful

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: virtualbox 4.1.0-dfsg-2ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-8.11-generic 3.0.1
Uname: Linux 3.0.0-8-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Mon Aug 15 22:16:24 2011
ExecutablePath: /usr/lib/virtualbox/VBoxSVC
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110805)
ProcCmdline: /usr/lib/virtualbox/VBoxSVC --auto-shutdown
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x515f8a: mov (%rdi),%r12
 PC (0x00515f8a) ok
 source "(%rdi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%r12" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: virtualbox
StacktraceTop:
 ?? ()
 ?? ()
 ?? ()
 ?? () from /usr/lib/virtualbox/VBoxRT.so
 ?? () from /usr/lib/virtualbox/VBoxRT.so
Title: VBoxSVC crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare sbuild