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[Bug 1044662] Re: compiz crashed with signal 5 (SIGTRAP) in g_logv() from g_log() from g_settings_schema_get_value() from g_settings_schema_key_init() from g_settings_get_value()


** Description changed:

+ [Impact]
+ Compiz crashes if a setting is not available when using gsettings backend, instead of falling back on the default.
+ [Test case]
+ This causes some temporary system changes:
+  sudo mv /usr/share/glib-2.0/schemas/org.compiz.unityshell.gschema.xml /tmp
+  sudo glib-compile-schemas /usr/share/glib-2.0/schemas/
+  initctl restart unity7
+ Unity should be now properly loaded, using default settings
+ (~/.cache/upstart/unity7.log should complain about that, but with no
+ crash).
+ To restore your state:
+   sudo mv /tmp/org.compiz.unityshell.gschema.xml /usr/share/glib-2.0/schemas
+   sudo glib-compile-schemas /usr/share/glib-2.0/schemas/
+ or
+   sudo apt-get install --reinstall unity
+ [Regression potential]
+ User settings might be ignored in some cases.
+ -------------
  crash during 2012.09.01 compiz update
  (quantal installed on virtualbox)
  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: compiz-core 1:
  ProcVersionSignature: Ubuntu 3.5.0-13.14-generic 3.5.3
  Uname: Linux 3.5.0-13-generic x86_64
  ApportVersion: 2.5.1-0ubuntu4
  Architecture: amd64
   [  104.602256] ISO 9660 Extensions: Microsoft Joliet Level 3
   [  104.732537] ISO 9660 Extensions: RRIP_1991A
   [  928.134106] show_signal_msg: 24 callbacks suppressed
   [  928.134110] compiz[1661]: segfault at 105112644 ip 00007f0a55ab63ec sp 00007fff6acb4010 error 6 in libc-2.15.so[7f0a55a2b000+1b2000]
   [  929.026467] compiz[2550] trap int3 ip:7ff2c0e9dfcf sp:7fffc2102180 error:0
  Date: Sat Sep  1 11:06:53 2012
  DistUpgraded: Fresh install
  DistroCodename: quantal
  DistroVariant: ubuntu
   virtualbox-guest, 4.1.18, 3.5.0-10-generic, x86_64: installed
   virtualbox-guest, 4.1.18, 3.5.0-11-generic, x86_64: installed
   virtualbox-guest, 4.1.18, 3.5.0-13-generic, x86_64: installed
  ExecutablePath: /usr/bin/compiz
  GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter [80ee:beef] (prog-if 00 [VGA controller])
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120724.2)
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcCmdline: compiz
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-13-generic root=UUID=d7944af3-f0a6-4074-b1c2-cfc5e67479f2 ro quiet splash vt.handoff=7
  Signal: 5
  SourcePackage: compiz
   ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
   ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
   g_settings_get_value () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
   getVariantAtKey () from /usr/lib/libcompizconfig_gsettings_backend.so
   readOption () from /usr/lib/compizconfig/backends/libgsettings.so
  Title: compiz crashed with signal 5 in g_settings_get_value()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  version.compiz: compiz 1:
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.38-0ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0~git20120821.c1114c61-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0~git20120821.c1114c61-0ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120713.6ef1ad6a-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.3-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.1-4~ubuntu1

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  compiz crashed with signal 5 (SIGTRAP) in g_logv() from g_log() from
  g_settings_schema_get_value() from g_settings_schema_key_init() from

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