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[Łukasz Zemczak <1748330@xxxxxxxxxxxxxxxxxx>]

** Also affects: unity (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1748330

Title:
  Changing monitor configurations after changing lowgfx mode could lead
  to a crash

Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Xenial:
  New

Bug description:
  [Impact]

  When changing monitor settings unity might crash with this backtrace:

  #0  0x00007f90dae11428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
  #1  0x00007f90dae1302a in __GI_abort () at abort.c:89
  #2  0x00007f90db44b84d in __gnu_cxx::__verbose_terminate_handler() () at ../../../../src/libstdc++-v3/libsupc++/vterminate.cc:95
  #3  0x00007f90db4496b6 in __cxxabiv1::__terminate(void (*)()) (handler=<optimized out>)
      at ../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:47
  #4  0x00007f90db449701 in std::terminate() () at ../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:57
  #5  0x00007f90db449919 in __cxxabiv1::__cxa_throw(void*, std::type_info*, void (*)(void*)) (obj=0x246fb00, tinfo=0x7f90db731a20 <typeinfo for std::bad_function_call>, dest=0x7f90db472920 <std::bad_function_call::~bad_function_call()>)
      at ../../../../src/libstdc++-v3/libsupc++/eh_throw.cc:87
  #6  0x00007f90db4728b2 in std::__throw_bad_function_call() () at ../../../../../src/libstdc++-v3/src/c++11/functexcept.cc:136
  #7  0x00007f90b9a9d2cc in unity::hud::Controller::SetupWindow() (this=0x17cf688) at /usr/include/c++/5/functional:2266
  #8  0x00007f90b9a9d2cc in unity::hud::Controller::SetupWindow() (this=this@entry=0x17cf420)
      at /build/unity-UBalge/unity-7.4.5+16.04.20171201.3/hud/HudController.cpp:125
  #9  0x00007f90b9a9effc in unity::hud::Controller::EnsureHud() (this=this@entry=0x17cf420)
      at /build/unity-UBalge/unity-7.4.5+16.04.20171201.3/hud/HudController.cpp:200
  #10 0x00007f90b9aa00e4 in unity::hud::Controller::Relayout(bool) (this=0x17cf420, check_monitor=<optimized out>)
      at /build/unity-UBalge/unity-7.4.5+16.04.20171201.3/hud/HudController.cpp:271
  #11 0x00007f90b9c4d350 in unity::UScreen::Refresh() (_A_a2=..., _A_a1=@0xd08c58: 0, impl=0xd08d60)
      at /usr/include/sigc++-2.0/sigc++/signal.h:1250
  #12 0x00007f90b9c4d350 in unity::UScreen::Refresh() (this=0xd08c08, _A_a2=..., _A_a1=@0xd08c58: 0)
      at /usr/include/sigc++-2.0/sigc++/signal.h:2949
  #13 0x00007f90b9c4d350 in unity::UScreen::Refresh() (this=0xd08c00)
      at /build/unity-UBalge/unity-7.4.5+16.04.20171201.3/unity-shared/UScreen.cpp:191
  #14 0x00007f90b9c4df9c in std::_Function_handler<bool(), unity::UScreen::Changed(GdkScreen*)::<lambda()> >::_M_invoke(const std::_Any_data &) (__closure=0x3e902a8) at /build/unity-UBalge/unity-7.4.5+16.04.20171201.3/unity-shared/UScreen.cpp:149
  #15 0x00007f90b9c4df9c in std::_Function_handler<bool(), unity::UScreen::Changed(GdkScreen*)::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...) at /usr/include/c++/5/functional:1857
  #16 0x00007f90b62878ca in unity::glib::Source::SourceCallback(void*) () at /usr/lib/x86_64-linux-gnu/libunity-core-6.0.so.9
  #17 0x00007f90d970604a in g_main_context_dispatch (context=0x6cb380) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3154
  #18 0x00007f90d970604a in g_main_context_dispatch (context=context@entry=0x6cb380)
      at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3769
  #19 0x00007f90d97063f0 in g_main_context_iterate (context=0x6cb380, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3840
  #20 0x00007f90d9706712 in g_main_loop_run (loop=0x6cb010) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:4034
  #21 0x00007f90db79c31f in compiz::private_screen::EventManager::startEventLoop(_XDisplay*) ()
      at /usr/lib/x86_64-linux-gnu/libcompiz_core.so.ABI-20170630
  #22 0x00000000004017c1 in main ()

  [ Test case ]

   - Change gsetting lowgfx mode
     * gsettings set com.canonical.Unity lowgfx false
     * gsettings set com.canonical.Unity lowgfx true
   - In unity-control-center display seettings change display or scaling values
   - Open HUD
   - Unity should not crash

  [ Regression potential ]

  UI doesn't adapt properly to monitor changes.

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