gnome-shell crashed with signal 5 in cogl_framebuffer_allocate()

[Gerhard Bogner]

gnome shell crashed after unlocking the screen (or while the screen was locked)

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: gnome-shell 3.6.3.1-0ubuntu3
ProcVersionSignature: Ubuntu 3.8.0-8.17-generic 3.8.0
Uname: Linux 3.8.0-8-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9-0ubuntu2
Architecture: amd64
CrashCounter: 1
Date: Fri Mar 1 17:30:57 2013
DisplayManager: gdm
ExecutablePath: /usr/bin/gnome-shell
InstallationDate: Installed on 2012-07-11 (233 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120627)
MarkForUpload: True
ProcCmdline: /usr/bin/gnome-shell
Signal: 5
SourcePackage: gnome-shell
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libcogl.so.12
 ?? () from /usr/lib/x86_64-linux-gnu/libcogl.so.12
 cogl_framebuffer_allocate () from /usr/lib/x86_64-linux-gnu/libcogl.so.12
 ?? () from /usr/lib/x86_64-linux-gnu/libcogl.so.12
 cogl_framebuffer_clear4f () from /usr/lib/x86_64-linux-gnu/libcogl.so.12
Title: gnome-shell crashed with signal 5 in cogl_framebuffer_allocate()
UpgradeStatus: Upgraded to raring on 2013-02-04 (26 days ago)
UserGroups: adm cdrom debian-transmission dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 _cogl_set_error (error=error@entry=0x0, domain=<optimized out>, code=code@entry=0, format=format@entry=0x7fcf5b07a718 "Failed to create an OpenGL framebuffer object") at ./cogl-error.c:78
 _cogl_offscreen_gl_allocate (offscreen=0x4c2df00, error=0x0) at ./driver/gl/cogl-framebuffer-gl.c:844
 cogl_framebuffer_allocate (framebuffer=framebuffer@entry=0x4c2df00, error=error@entry=0x0) at ./cogl-framebuffer.c:727
 _cogl_framebuffer_gl_flush_state (draw_buffer=0x4c2df00, read_buffer=0x4c2df00, state=(COGL_FRAMEBUFFER_STATE_BIND | COGL_FRAMEBUFFER_STATE_VIEWPORT | COGL_FRAMEBUFFER_STATE_CLIP | COGL_FRAMEBUFFER_STATE_DITHER | COGL_FRAMEBUFFER_STATE_MODELVIEW | COGL_FRAMEBUFFER_STATE_PROJECTION | COGL_FRAMEBUFFER_STATE_COLOR_MASK | COGL_FRAMEBUFFER_STATE_FRONT_FACE_WINDING)) at ./driver/gl/cogl-framebuffer-gl.c:311
 cogl_framebuffer_clear4f (framebuffer=0x4c2df00, buffers=buffers@entry=1, red=0, green=0, blue=0, alpha=0) at ./cogl-framebuffer.c:369

[Launchpad Janitor (janitor)]

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

[Patrik Lundquist (patrik-lundquist)]

1) Logged in with User1.
2) Logged in with User2 on the desktop too.
3) Switched to the virtual console (Ctrl-Alt-F1).
4) Switched backed to the desktop (Ctrl-Alt-F7) and gnome-shell crashed.
5) Got the broken desktop of User1 instead of User2, which has serious security implications since it is working well enough to send this bug report.