gnome-shell crashed with SIGSEGV in meta_window_move_frame()

[Sparhawk]

Just tried gnome-shell for the first time in the last two days. It's crashing like crazy for me. Freezing up every 20 minutes, then I have to change to tty1 and kill it. This is just one bug of many! (N.B. I haven't restarted yet, and I feel like I've got more crashes since I killed gnome-shell and restarted it via tty1. So perhaps it'd be not quite so severe if I just restarted.)

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gnome-shell 3.4.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
Uname: Linux 3.2.0-30-generic x86_64
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
Date: Sun Sep 16 20:34:04 2012
ExecutablePath: /usr/bin/gnome-shell
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: gnome-shell
SegvAnalysis:
 Segfault happened at: 0x7f68657e9e67 <meta_window_move_frame+71>: add 0x28(%rax),%ecx
 PC (0x7f68657e9e67) ok
 source "0x28(%rax)" (0x00000028) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 meta_window_move_frame () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
 meta_display_process_key_event () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
Title: gnome-shell crashed with SIGSEGV in meta_window_move_frame()
UpgradeStatus: Upgraded to precise on 2012-04-29 (140 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 meta_window_move_frame (window=0x449a820, user_op=1, root_x_nw=0, root_y_nw=<optimized out>) at core/window.c:5121
 handle_move_to_corner_backend (window=0x449a820, xchange=1, ychange=0, to_right=0, to_bottom=0, display=<optimized out>, screen=<optimized out>, dummy=<optimized out>) at core/keybindings.c:2668
 process_event (bindings=<optimized out>, n_bindings=<optimized out>, display=0x3403b60, screen=0x25021c0, window=0x449a820, event=0x7fff0655d2a0, on_window=1, keysym=<optimized out>) at core/keybindings.c:1441
 meta_display_process_key_event (display=0x3403b60, window=0x449a820, event=0x7fff0655d2a0) at core/keybindings.c:1683
 event_callback (event=0x7fff0655d2a0, data=0x3403b60) at core/display.c:1795

[Sparhawk (sparhawkthesecond)]

Ok, so it seems like I can crash this at will by pressing ctrl+alt+<keypad number>, in an attempt to place a window. I'm not even sure where this shortcut is defined, so I'm not sure the actual function of this keystroke. I checked System Settings, and dconf editor (org.gnome.desktop.wm.keybindings and org.gnome.mutter.keybindings), but it appeared this keybinding was not defined anywhere!

[Launchpad Janitor (janitor)]

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

[Jeremy Bícha (jbicha)]

Thank you for reporting this bug to Ubuntu. Ubuntu 12.04 LTS reached End of
Life in April. See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

Please upgrade to Ubuntu 16.04 LTS and re-test. If the bug is still
reproducible, increase the verbosity of the steps to recreate it so we
can try again.

I apologize that we are not always to respond to bug reports promptly.
Do feel free to report any other bugs you may find.