gala crashed with SIGSEGV in meta_window_get_workspace()

[Reynhard Arthur]

gala is crashing everytime I use hot corner with "show all windows" options, after crashes I can't change workspaces and even can't change window.

ProblemType: Crash
DistroRelease: elementary OS 0.2
Package: gala 0.1.0~r364+pkg20~ubuntu0.2.1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: Ubuntu 3.2.0-57.87-generic-pae 3.2.52
Uname: Linux 3.2.0-57-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.6+elementary3~ubuntu12.04.1
Architecture: i386
CrashCounter: 1
CrashDB: gala
Date: Fri Dec 20 05:45:27 2013
ExecutablePath: /usr/bin/gala
GsettingsChanges:

InstallationMedia: elementary OS 0.2 "Luna" - Beta 1 i386 (20121114)
MarkForUpload: True
ProcCmdline: gala
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb774de64 <meta_window_get_workspace+4>: testb $0x8,0xd4(%eax)
 PC (0xb774de64) ok
 source "$0x8" ok
 destination "0xd4(%eax)" (0x000001b4) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: gala
StacktraceTop:
 meta_window_get_workspace () from /usr/lib/libmutter.so.0
 ?? ()
 ?? ()
 ?? () from /usr/lib/i386-linux-gnu/libclutter-1.0.so.0
 ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
Title: gala crashed with SIGSEGV in meta_window_get_workspace()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Tom Beckmann (tombeckmann)]

Thanks for you report!
Are you on Luna or Isis? I've heard of this before, but only on Isis.

When precisely is it crashing? Do the windows start animating or does it crash as soon as you hit the keyboard shortcut or can you even select a window?

[Reynhard Arthur (reyn-art)]

Hi, sorry for the late reply,

I'm using OS 0.2 Luna and it's crashes as soon as I use shortcut <super> a or hot corner with "show all windows" option, and clicked any windows on another workspaces (the animation is still running before I click). I can't even change or select (bring to front) the other window or change workspaces with shortcut or hot corner.

any other options (workspace overview, show applications menu, window overview, maximize/minimize current window) seems to be just fine, as I have checked each options and it seems like the only problem is with "show all windows" option.

any help would be appreciated.

[Archie B (not-really-archie)]

Can confirm this bug. Started happening around the same time as OP. Also running Luna but with

Kernel: 3.12.6
Display Drivers: nvidia 331.20 drivers
Architecture: 64-bit

[Sergey "Shnatsel" Davidoff (shnatsel)]

StacktraceTop:
 meta_window_get_workspace (window=0xe0) at core/window.c:10299
 block13_data_unref (_userdata_=0x9b847a0) at /build/buildd/gala-0.1.0~r368+pkg20~ubuntu12.04.1/src/Widgets/WindowOverview.vala:686
 ___lambda33_ (_data13_=0x9b847a0) at /build/buildd/gala-0.1.0~r368+pkg20~ubuntu12.04.1/src/Widgets/WindowOverview.vala:695
 _clutter_threads_dispatch (data=0x9ebbd10) at ./clutter-main.c:1043
 g_timeout_dispatch (source=0x9b8f510, callback=0xb7599c80 <_clutter_threads_dispatch>, user_data=0x9ebbd10) at /build/buildd/glib2.0-2.32.4/./glib/gmain.c:3882

[Ben Zacker (comkid)]

Fixed by https://code.launchpad.net/~gala-dev/gala/multitasking-view in Isis (not sure about Luna, as I've never encountered the bug in Luna)

[Reynhard Arthur (reyn-art)]

Sorry for my late reply, but I have found the solution for my problem in Luna. It looks like upgrading libmutter0 from 3.4.1-0ubuntu99~elementary7 to 3.4.1-0ubuntu99~elementary8 and reinstalling gala is the solution for the problem in Luna. Gala is running smoothly ever since.

thank you everyone.