VBoxClient crashed with SIGSEGV in XNextEvent()

[Matthew Lancey]

happened spontaneously after restarting following aptitude dist-upgrade last night

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: virtualbox-guest-x11 4.1.0-dfsg-2ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic i686
Architecture: i386
Date: Fri Aug 12 17:42:17 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/VBoxClient
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110728)
ProcCmdline: /usr/bin/VBoxClient --seamless
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f67e7 <XNextEvent+119>: add %al,-0x76f98b40(%ebp)
 PC (0x007f67e7) ok
 source "%al" ok
 destination "-0x76f98b40(%ebp)" (0x890674c0) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: virtualbox
StacktraceTop:
 XNextEvent () from /usr/lib/i386-linux-gnu/libX11.so.6
 ?? ()
 ?? ()
 __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
 ?? ()
Title: VBoxClient crashed with SIGSEGV in XNextEvent()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 XNextEvent (dpy=0x0, event=0xbf8755fc) at ../../src/NextEvent.c:55
 SeamlessService::run (this=0x9d81048, fDaemonised=true) at /build/buildd/virtualbox-4.1.0-dfsg/src/VBox/Additions/x11/VBoxClient/seamless.cpp:47
 main (argc=2, argv=0xbf875764) at /build/buildd/virtualbox-4.1.0-dfsg/src/VBox/Additions/x11/VBoxClient/main.cpp:290

[Launchpad Janitor (janitor)]

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