#0 0xb6d7a85a in mir::RecursiveReadWriteMutex::read_unlock() () from /usr/lib/arm-linux-gnueabihf/libmircommon.so.5
#1 0xb6e0c15c in ~RecursiveReadLock (this=<synthetic pointer>, __in_chrg=<optimized out>)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/include/common/mir/recursive_read_write_mutex.h:60
#2 mir::ThreadSafeList<std::shared_ptr<mir::scene::Observer> >::add (this=this@entry=0x814178, element=std::shared_ptr (count 1, weak 0) 0x8908ec)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/include/common/mir/thread_safe_list.h:97
#3 0xb6e0833c in mir::scene::SurfaceStack::add_observer (this=0x8140e8, observer=std::shared_ptr (count 1, weak 0) 0x8908ec)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/scene/surface_stack.cpp:405
#4 0xb6e1a0e0 in mir::compositor::MultiThreadedCompositor::start (this=0x890844)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/compositor/multi_threaded_compositor.cpp:306
#5 0xb6e03bf2 in ~ApplyNowAndRevertOnScopeExit (this=0xbec999cc, __in_chrg=<optimized out>)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/scene/mediating_display_changer.cpp:49
#6 mir::scene::MediatingDisplayChanger::apply_config (this=this@entry=0x890b2c, conf=std::shared_ptr (count 2, weak 0) 0x9152c0, pause_resume_system=<optimized out>)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/scene/mediating_display_changer.cpp:186
#7 0xb6e03cb6 in mir::scene::MediatingDisplayChanger::apply_base_config (this=0x890b2c, pause_resume_system=<optimized out>)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/scene/mediating_display_changer.cpp:199
#8 0xb6e044f0 in operator() (__closure=0x911960) at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/scene/mediating_display_changer.cpp:153
#9 std::_Function_handler<void(), mir::scene::MediatingDisplayChanger::configure_for_hardware_change(const std::shared_ptr<mir::graphics::DisplayConfiguration>&, mir::DisplayChanger::SystemStateHandling)::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...) at /usr/include/c++/4.9/functional:2039
---Type <return> to continue, or q <return> to quit---
#10 0xb6dc7ca8 in operator() (__closure=0x911948) at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/glib_main_loop.cpp:192
#11 std::_Function_handler<void(), mir::GLibMainLoop::enqueue(void const*, const ServerAction&)::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...)
at /usr/include/c++/4.9/functional:2039
#12 0xb6dc9b5c in mir::detail::ServerActionGSource::dispatch (source=<optimized out>) at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/glib_main_loop_sources.cpp:202
#13 0xb696af68 in g_main_dispatch (context=0x6b6d20) at /build/buildd/glib2.0-2.44.1/./glib/gmain.c:3122
#14 g_main_context_dispatch (context=context@entry=0x6b6d20) at /build/buildd/glib2.0-2.44.1/./glib/gmain.c:3737
#15 0xb696b114 in g_main_context_iterate (context=context@entry=0x6b6d20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
at /build/buildd/glib2.0-2.44.1/./glib/gmain.c:3808
#16 0xb696b194 in g_main_context_iteration (context=0x6b6d20, may_block=1) at /build/buildd/glib2.0-2.44.1/./glib/gmain.c:3869
#17 0xb6dc7c48 in mir::GLibMainLoop::run (this=0x6b9530) at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/glib_main_loop.cpp:134
#18 0xb6dc1668 in mir::DisplayServer::run (this=this@entry=0xbec99b68) at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/display_server.cpp:222
#19 0xb6dbee36 in mir::run_mir(mir::ServerConfiguration&, std::function<void (mir::DisplayServer&)>, std::function<void (int)> const&) (config=..., init=..., terminator=...)
at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/run_mir.cpp:115
#20 0xb6dcf24a in mir::Server::run (this=0x6ae8a8) at /build/mir-o62XoE/mir-0.14.1+15.04.20150804.4/src/server/server.cpp:363
#21 0x00035a8e in usc::SystemCompositor::run() ()