compiz crashed with SIGSEGV in nux::Property<nux::color::Color>::operator=() from unity::switcher::SwitcherController::OnBackgroundUpdate()

StacktraceTop:
 empty (this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot_base.h:273
 operator() (_A_a2=..., _A_a1=..., this=0x3b1a908) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:592
 Set (value=..., this=0x3b1a8e0) at /usr/include/Nux-1.0/NuxCore/Property-inl.h:105
 nux::Property<nux::color::Color>::operator= (this=<optimized out>, value=<optimized out>) at /usr/include/Nux-1.0/NuxCore/Property-inl.h:75
 unity::switcher::SwitcherController::OnBackgroundUpdate (data=<optimized out>, self=0x1c27b30) at /build/buildd/unity-4.24.0/plugins/unityshell/src/SwitcherController.cpp:66

Okay, so this crash occurred when you changed options in CCSM. What happened after that? Did you get to a successful Unity session after a reboot?

If yes, then it *may* be normal, not a bug. If no, then its purely a bug.

Confirmed. valgrind says:

==22465== Process terminating with default action of signal 11 (SIGSEGV)
==22465== Access not within mapped region at address 0x78
==22465== at 0x18C9D17D: nux::Property<nux::color::Color>::operator=(nux::color::Color const&) (slot_base.h:273)
==22465== by 0x18C9C4D2: unity::switcher::SwitcherController::OnBackgroundUpdate(_GVariant*, unity::switcher::SwitcherController*) (SwitcherController.cpp:66)
==22465== by 0x18D3FD48: ubus_server_pump_message_queue(_UBusServer*) (ubus-server.cpp:284)
==22465== by 0x66A6A5C: g_main_context_dispatch (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3000.0)
==22465== by 0x66A7257: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3000.0)
==22465== by 0x66A7791: g_main_loop_run (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3000.0)
==22465== by 0x42E855: CompScreen::eventLoop() (in /usr/bin/compiz)
==22465== by 0x422219: main (in /usr/bin/compiz)

regression-release, because the offending code is new in oneiric and the use-case definitely worked in natty.

This bug was fixed in the package unity - 5.0.0-0ubuntu1

---------------
unity (5.0.0-0ubuntu1) precise; urgency=low

  [ Didier Roche ]
  * New upstream release.
    - compiz crashed with SIGSEGV in __dynamic_cast() (LP: #853038)
    - unity-panel-service crashed with SIGSEGV in panel_service_show_entry()
      (LP: #861144)
    - unity-panel-service crashed with SIGSEGV in
      panel_indicator_entry_accessible_get_n_children() (LP: #869816)
    - Launcher - Launcher icon for Dash does not highlight when the Alt+F1 key
      shortcut is pressed (LP: #849561)
    - compiz crashed with SIGSEGV in unity::PanelTray::FilterTrayCallback()
      (LP: #868868)
    - [regression] Compiz: Visible tearing is worse in 11.10 than 11.04, even
      when "Sync To VBlank" is enabled, but only when Unity is active.
      (LP: #880707)
    - [regression] All apps have a lower frame rate under Unity. (LP: #861061)
    - compiz crashed with SIGSEGV in
      nux::Property<nux::color::Color>::operator=() from
      unity::switcher::SwitcherController::OnBackgroundUpdate() (LP: #887465)
    - DashSearchBarSpinner.cpp:56: Conditional jump or move depends on
      uninitialised value(s) (LP: #901610)
    - quicklist shows in incorrect position when launched from workspace
      switcher (LP: #914251)
    - Build "show me the desktop" mini-app that adds a show desktop button to
      Launcher (LP: #681348)
    - Select quicklist items with just one right click (LP: #688830)
    - cannot change volume by scrolling on the icon when the SoundMenu is
      opened (LP: #722082)
    - [a11y] Unity launcher buttons are not Actionable (LP: #772573)
    - Ubuntu Start launcher item doesn't start dash with keyboard navigation
      (LP: #825037)
    - multimonitor , window management - Multi-Monitor Maximized Difficulty
      (LP: #843958)
    - [regression] Drag and drop inside dash is very slow with Active Blur
      activated (LP: #851172)
    - Activating an alt-tab icon that holds initially unminimized windows
      should unminimize all windows (LP: #854595)
    - Dash - The Dash category headers are positioned incorrectly
      (LP: #839467)
    - Missing global menu with a semi-maximized window dragged to the right.
      (LP: #861279)
    - Launcher - Dragging and dropping a running application in to the Trash
      should quit the application and (if the app is pinned to the Launcher)
      un-pin the application from the Launcher (LP: #870143)
    - top bar, integrated menu - when a application is first launched, the
      integrated menu should be displayed for 2 seconds before fading out of
      view (LP: #874254)
    - Window control buttons are not shown when an indicator is opened and the
      pointer is over the top-left corner (LP: #890970)
    - Quicklist item using some special chars doesn't show at all
      (LP: #899677)
    - PanelView.cpp:370: Conditional jump or move depends on uninitialised
      value(s) (LP: #901602)
    - unityshell.cpp:1982,1984: Conditional jump or move depends on
      uninitialised value(s) (LP: #901603)
    - Dash Search spinner sometimes doesn't spin at all (LP: #903090)
    - Point of tooltip is misaligned to focused ap...

Hello GaaL, or anyone else affected,

Accepted unity into oneiric-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

This bug was fixed in the package unity - 4.28.0-0ubuntu2

---------------
unity (4.28.0-0ubuntu2) oneiric-proposed; urgency=low

  * Cherry-pick some additional fixes:
    - fix a regression where transparency is setup on the panel (LP: #830949)
    - the wrong commit causing a crash was revert. Revert the revert and
      revert the right guilty commit.

unity (4.28.0-0ubuntu1) oneiric-proposed; urgency=low

  * New upstream release.
    - don't segfault in geis_configuration_get_value() (lp: #850623)
    - get focus on dash by pressing the super key first time after login
      (lp: #860805)
    - clicking on panel when dash is open no longer causes maximized window
      to raise (lp: #873100)
    - window management, alt-tab - After using 'show desktop' to minimise all
      windows, opening any new window also incorrectly restores all
      the minimised windows (lp: #871801)
    - compiz crashed with SIGSEGV in
      unity::switcher::SwitcherModel::DetailSelectionWindow() (lp: #834630)
    - compiz crashed with SIGSEGV in g_strcmp0() (lp: #832151)
    - compiz crashed with SIGSEGV in nux::BaseWindow::GetInputWindowId()
      (when onboard is used) (lp: #865890)
    - fix multi-monitor crashers (lp: #838128, #864037, #864784, #868120)
    - Fix SIGSEGV after SwitcherController desctruction (lp: #887465)
    - Fix for "right-clicking launcher when choosing a workspace causes
      quicklists to freeze" (lp: #791810)
  * debian/patches/add_postrelease_buildfix.patch:
    - add post-release fix to build in a clean env
  * backport some additional reverts or regression fixes
 -- Didier Roche <email address hidden> Thu, 19 Jan 2012 09:54:44 +0100