This bug was fixed in the package unity - 6.10.0-0ubuntu3

---------------
unity (6.10.0-0ubuntu3) raring; urgency=low

  * Upload to raring

unity (6.10.0-0ubuntu2) quantal-proposed; urgency=low

  * Cherry-picked from upstream:
    - [SRU Regression] Launcher icon corruption while rearranging
      (LP: #1071813)

unity (6.10.0-0ubuntu1) quantal-proposed; urgency=low

  [ Timo Jyrinki ]
  * New upstream release.
    - Gap between the dash gradient and the panel one (LP: #1062375)
    - [regression] Dash closes if the onscreen keyboard is outside of
      Dash' geometry (LP: #1058705)
    - Dash - Category expander arrow is in expanded mode no matter if
      category is actually expanded (LP: #1053047)
    - Unity panel does not show the kate menus in the correct order
      (LP: #1062283)
    - compiz crashed with SIGSEGV in g_type_check_instance_is_a() from
      g_object_unref() from _g_file_attribute_value_clear() from ... from
      query_info_async_cb() [libgvfsdbus.so] (LP: #1061510)
    - dash's music album previews: can't drag the scrollbar (LP: #1056995)
    - Small chunks of the panel shadow appear individually (and very dark)
      (LP: #1057528)
    - compiz crashed with SIGSEGV on Unity "Unmount" (LP: #1055812)
    - [regression] Dash - 'More suggestions' icons in App Lens are too
      large (LP: #1052513)
    - BamfLauncherIcon: ensure the icon and name values when the running
      state changes (LP: #772986)
    - Changes the swapping order of the detail mode. Now the currently
      active window gets moved to the end, instead of getting swapped
      with the last used window (LP: #1061229)
    - Fixes GetRegion tex coord maths (LP: #1058391)
    - Fixed fade-in behavior of Unity's showdesktop function (LP: #1063249)
    - Added <feature>showdesktop</feature> to unityshell.xml.in, because
      the feature showdesktop is provided by unityshell. (LP: #1006429)
      (LP: #1006434) (LP: #1063171)
    - Make HudLauncherIcon::ubus_manager_ "un-static" (LP: #1048274)
    - Fix reference counting problem which leads to memory leaks and a
      crash in MT grab handles (LP: #1046201)
    - Ensure categories with non-personal results can show up before empty
      categories with personal results (LP: #1067327)
    - fix a backup error (LP: #1066646)

  [ Łukasz 'sil2100' Zemczak ]
  * Cherry-picked from upstream:
    - Reverted the switch from boost to std which was part of the fix for
      LP: #1046201. The crash is still fixed without this change, so it was
      actually unneeded
 -- Didier Roche <didro...@ubuntu.com>   Fri, 09 Nov 2012 08:06:47 +0100

** Changed in: unity (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1055812

Title:
  compiz crashed with SIGSEGV on Unity "Unmount" in
  async_wrapper_callback() from g_simple_async_result_complete() from
  _g_simple_async_result_complete_with_cancellable() from
  unmount_reply()

Status in Unity:
  Fix Committed
Status in Unity 6.0 series:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released
Status in “unity” source package in Quantal:
  Fix Released

Bug description:
  [Impact]

  Crasher related to device mounting handling

  [SRU TESTCASE]

  1) Attach an USB stick to your computer
  2) Click on the USB device launcher icon so that it gets mounted
  3) Right click on the USB icon and click "Umount"

  What should happen:
  4) The usb stick is unmounted (the icon is removed from the launcher)
     with no unity crashes.

  [Regression potential]

  Test the testcase and volume handling in general, shouldn't affect
  anything else.

  ---------------------

  I can find a existing bug report. I get this crash after a restart of
  the system.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: compiz-core 1:0.9.8.2+bzr3377-0ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
  Uname: Linux 3.5.0-15-generic i686
  .tmp.unity.support.test.0:

  ApportVersion: 2.5.2-0ubuntu4
  Architecture: i386
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Mon Sep 24 23:12:11 2012
  Disassembly: => 0x0:  Cannot access memory at address 0x0
  DistUpgraded: 2012-08-14 21:13:32,503 DEBUG enabling apt cron job
  DistroCodename: quantal
  DistroVariant: ubuntu
  ExecutablePath: /usr/bin/compiz
  GraphicsCard:
   Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics 
Controller [8086:a011] (prog-if 00 [VGA controller])
     Subsystem: Samsung Electronics Co Ltd Device [144d:c072]
     Subsystem: Samsung Electronics Co Ltd Device [144d:c072]
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. N150
  ProcCmdline: compiz
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-15-generic 
root=UUID=aae38911-dfa1-41a0-9919-44adcbf61e2a ro quiet splash vt.handoff=7
  SegvAnalysis:
   Segfault happened at: 0x0:   Cannot access memory at address 0x0
   PC (0x00000000) not located in a known VMA region (needed executable region)!
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: compiz
  StacktraceTop:
   ?? ()
   ?? () from /usr/lib/i386-linux-gnu/gio/modules/libgioremote-volume-monitor.so
   g_simple_async_result_complete () from 
/usr/lib/i386-linux-gnu/libgio-2.0.so.0
   ?? () from /usr/lib/i386-linux-gnu/gio/modules/libgvfsdbus.so
   ?? () from /usr/lib/i386-linux-gnu/gio/modules/libgvfsdbus.so
  Title: compiz crashed with SIGSEGV in g_simple_async_result_complete()
  UpgradeStatus: Upgraded to quantal on 2012-08-14 (41 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 03/27/2010
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 01KB.M073.20100327.JIP
  dmi.board.asset.tag: SAMSUNG
  dmi.board.name: N150
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLtd.:bvr01KB.M073.20100327.JIP:bd03/27/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN150:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN150:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
  dmi.product.name: N150
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  version.compiz: compiz 1:0.9.8.2+bzr3377-0ubuntu1
  version.libdrm2: libdrm2 2.4.39-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0~git20120917.7cfd42ce-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0~git20120917.7cfd42ce-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu4
  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~git20120913.8637f772-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.8-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.2-0ubuntu1

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