compiz crashed with SIGSEGV in std::basic_string<...>::basic_string() from unity::launcher::HudLauncherIcon::HudLauncherIcon()::{lambda} from unity::UBusManager::OnCallback

StacktraceTop:
 _M_grab (__alloc2=<optimized out>, __alloc1=..., this=<optimized out>) at /build/buildd/gcc-4.6-4.6.3/build/x86_64-linux-gnu/libstdc++-v3/include/bits/basic_string.h:224
 std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string (this=0x7fff05f21410, __str=...) at /build/buildd/gcc-4.6-4.6.3/build/x86_64-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:175
 unity::launcher::HudLauncherIcon::HudLauncherIcon(unity::launcher::LauncherHideMode)::{lambda(_GVariant*)#1}::operator()(_GVariant*) const () at /usr/include/Nux-2.0/NuxCore/Property-inl.h:87
 operator() (_A_a1=@0x7fff05f21468, this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:515
 unity::UBusManager::OnCallback (args=0x10ae4a0, user_data=<optimized out>) at /build/buildd/unity-5.8.0/plugins/unityshell/src/UBusWrapper.cpp:67

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

This was fixed in unity-5.8.0-ubuntu2 package.

This bug was fixed in the package unity - 5.10.0-0ubuntu3

---------------
unity (5.10.0-0ubuntu3) precise-proposed; urgency=low

  [ Oliver Grawert ]
  * Enable subarch specific quilt support
  * add linaros disable_standalone-clients.patch to make unity build with GLES

  [ Didier Roche ]
  * remove a symlink and replace with a real file for
    debian/patches/series.<arch> as not supported in non v3 (and we don't
    want v3 format with full source upstream derived branch)

unity (5.10.0-0ubuntu2) precise-proposed; urgency=low

  [ Ricardo Salveti de Araujo ]
  * Enabling build with OpenGL ES2.0 support for ARM and disable maintainer
     mode on that arch to avoid -Werror failure (LP: #980544)

unity (5.10.0-0ubuntu1) precise-proposed; urgency=low

  * New upstream release:
    - bamfdaemon crashed with SIGABRT in g_assertion_message() (LP: #926208)
    - We are using 1 bad hack for compiz hanging on startup (LP: #963264)
    - GConf backend steals glib events from compiz (LP: #965220)
    - when I closed QupZill brawser it crashed and then and then I sow
      worrning that compiz crashed but fire fox and chrome is estle working.
      gtk-window-decorator crashed with SIGSEGV in max_window_name_width()
      (LP: #948580)
    - compiz crashed with SIGSEGV in std::basic_string<...>::basic_string()
      from unity::launcher::HudLauncherIcon::HudLauncherIcon()::{lambda} from
      unity::UBusManager::OnCallback (LP: #964897)
    - unity-panel-service crashed due to heap corruption in g_free() from
      service_proxy_name_changed() [libindicator/indicator-service-
      manager.c:574] (LP: #969360)
    - Opening dash while an application is maximized makes unity completely
      useless, have to relogin (LP: #975103)
    - unity crash on alt-tab (LP: #975168)
    - Top bar - Menus should be condensed to fit panel/overlay of appmenu
      (LP: #655184)
    - Topbar - window controls for maximised windows in the top bar should
      conform to Fitts's law (LP: #839690)
    - [FFe, UIFe] Dash - When the Dash is open and there is a maximised app in
      the background, the top bar background should not disappear
      (LP: #839480)
    - Dash - The inner bottom left, bottom right and top right corners of the
      desktop dash border are rendered incorrectly (LP: #839476)
    - Showdesktoped window contents invisible in window spread (LP: #877778)
    - Maximized windows can be accidentally closed from wrong monitor.
      (LP: #865701)
    - Unity launcher on-screen corruption on resume from suspend with nVidia
      proprietary driver (LP: #915265)
    - Launcher - Inserting items into launcher makes unnecessary animations on
      other monitors (LP: #925021)
    - Far left character in panel (and launcher popups) distorted
      (LP: #927441)
    - Jenkins build failure: SetAcceptKeyNavFocusOnMouseEnter not declared
      (LP: #938037)
    - super+<unbound key> and sometimes super+<number> keys now cause launch
      to wedge with the key hints shown and retains focus instead of selecting
      the requested window (LP: #934084)
    - three-finger move does not move (Precise) (LP: #940612)
    - compiz crashed with SIGSEGV in std::__de...

No fix was ever committed AFAIK and I just got the same crash in 12.10 with Unity 6.0. So definitely not fixed.

I know there is always some disagreement as to whether it's appropriate to reopen bugs. For the record, I reopened this one because:
  1. There is no record of a fix ever being committed in Launchpad or the history log of lp:unity; and
  2. The crash continues to happen with Unity 6.0 (bug 1024908).

This is a truly horrible stack trace. I can't see how this is failing. I'm going to change the code to not use a lambda in the hope that if this does reoccur, we will have something more reasonable.