Process ID:   1120
Program name: unity-system-co
Program path: /usr/sbin/unity-system-compositor
Thread count: 5

Dstack of unity-system-co pid 1120 (/usr/sbin/unity-system-compositor)

[Switching to thread 1 (Thread 0x7f9793eb47c0 (LWP 1120))]
#0  0x00007f979369466b in pthread_join (threadid=140288752011008, 
    thread_return=0x0) at pthread_join.c:92
92	in pthread_join.c
#0  0x00007f979369466b in pthread_join (threadid=140288752011008, 
    thread_return=0x0) at pthread_join.c:92
#1  0x00007f97924999e7 in __gthread_join (__value_ptr=0x0, 
    __threadid=<optimised out>)
    at /build/buildd/gcc-4.8-4.8.2/build/x86_64-linux-gnu/libstdc++-v3/include/x86_64-linux-gnu/bits/gthr-default.h:668
#2  std::thread::join (this=0x16a57f0)
    at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:107
#3  0x00007f97939b492b in mir::frontend::BasicConnector::stop() ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#4  0x00007f9793983b72 in mir::DisplayServer::Private::pause() ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#5  0x00007f978b670901 in ?? ()
   from /usr/lib/x86_64-linux-gnu/mir/platformgraphics/mesa/libmirplatformgraphics.so
#6  0x00007f979398cc20 in mir::AsioMainLoop::SignalHandler::handle(boost::system::error_code, int) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#7  0x00007f979398a4f2 in boost::asio::detail::signal_handler<std::_Bind<std::_Mem_fn<void (mir::AsioMainLoop::SignalHandler::*)(boost::system::error_code, int)> (mir::AsioMainLoop::SignalHandler*, std::_Placeholder<1>, std::_Placeholder<2>)> >::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&, unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#8  0x00007f979398e62f in boost::asio::detail::task_io_service::run(boost::system::error_code&) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#9  0x00007f9793989346 in mir::AsioMainLoop::run() ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#10 0x00007f9793982a84 in mir::DisplayServer::run() ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#11 0x00007f979397e13f in mir::run_mir(mir::ServerConfiguration&, std::function<void (mir::DisplayServer&)>) ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#12 0x0000000000422b9c in SystemCompositor::run(int, char**) ()
#13 0x000000000041c0b7 in main ()

[Switching to thread 2 (Thread 0x7f97853ac700 (LWP 1149))]
#0  __lll_lock_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#0  __lll_lock_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007f9793695657 in _L_lock_909 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007f9793695480 in __GI___pthread_mutex_lock (mutex=0x7f9768001c50)
    at ../nptl/pthread_mutex_lock.c:79
#3  0x00007f97939af4c7 in mir::frontend::SessionMediator::next_buffer(google::protobuf::RpcController*, mir::protobuf::SurfaceId const*, mir::protobuf::Buffer*, google::protobuf::Closure*) ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#4  0x00007f97939b14c9 in void mir::frontend::detail::invoke<mir::frontend::detail::ProtobufMessageProcessor, mir::protobuf::DisplayServer, mir::protobuf::SurfaceId, mir::protobuf::Buffer>(mir::frontend::detail::ProtobufMessageProcessor*, mir::protobuf::DisplayServer*, void (mir::protobuf::DisplayServer::*)(google::protobuf::RpcController*, mir::protobuf::SurfaceId const*, mir::protobuf::Buffer*, google::protobuf::Closure*), mir::frontend::detail::Invocation const&) ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#5  0x00007f97939b192e in mir::frontend::detail::ProtobufMessageProcessor::dispatch(mir::frontend::detail::Invocation const&) ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#6  0x00007f97939b92ab in mir::frontend::detail::SocketSession::on_new_message(boost::system::error_code const&) ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#7  0x00007f97939bc4cf in boost::asio::detail::read_streambuf_op<boost::asio::basic_stream_socket<boost::asio::local::stream_protocol, boost::asio::stream_socket_service<boost::asio::local::stream_protocol> >, std::allocator<char>, boost::asio::detail::transfer_exactly_t, std::function<void (boost::system::error_code const&, unsigned long)> >::operator()(boost::system::error_code const&, unsigned long, int) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#8  0x00007f97939bcbaf in boost::asio::detail::reactive_socket_recv_op<boost::asio::mutable_buffers_1, boost::asio::detail::read_streambuf_op<boost::asio::basic_stream_socket<boost::asio::local::stream_protocol, boost::asio::stream_socket_service<boost::asio::local::stream_protocol> >, std::allocator<char>, boost::asio::detail::transfer_exactly_t, std::function<void (boost::system::error_code const&, unsigned long)> > >::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&, unsigned long) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#9  0x00007f979398e62f in boost::asio::detail::task_io_service::run(boost::system::error_code&) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#10 0x00007f97939b49cd in ?? ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#11 0x00007f9792499bf0 in std::(anonymous namespace)::execute_native_thread_routine (__p=<optimised out>)
    at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
#12 0x00007f9793693182 in start_thread (arg=0x7f97853ac700)
    at pthread_create.c:312
#13 0x00007f9791f0712d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

[Switching to thread 3 (Thread 0x7f9785bad700 (LWP 1148))]
#0  0x00007f9791ef9ddd in poll () at ../sysdeps/unix/syscall-template.S:81
#0  0x00007f9791ef9ddd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f978f9d6fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f978f9d70ec in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9792c1f9ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f9792bd196b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f9792bd80e1 in QCoreApplication::exec() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x0000000000423071 in SystemCompositor::qt_main(int, char**) ()
#7  0x00007f9792499bf0 in std::(anonymous namespace)::execute_native_thread_routine (__p=<optimised out>)
    at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
#8  0x00007f9793693182 in start_thread (arg=0x7f9785bad700)
    at pthread_create.c:312
#9  0x00007f9791f0712d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

[Switching to thread 4 (Thread 0x7f97863ae700 (LWP 1147))]
#0  0x00007f9791f077c3 in epoll_wait ()
    at ../sysdeps/unix/syscall-template.S:81
#0  0x00007f9791f077c3 in epoll_wait ()
    at ../sysdeps/unix/syscall-template.S:81
#1  0x00000000004250c8 in boost::asio::detail::epoll_reactor::run(bool, boost::asio::detail::op_queue<boost::asio::detail::task_io_service_operation>&) ()
#2  0x00000000004269d8 in boost::asio::detail::task_io_service::run(boost::system::error_code&) ()
#3  0x000000000041c6b6 in SystemCompositor::main() ()
#4  0x00007f9792499bf0 in std::(anonymous namespace)::execute_native_thread_routine (__p=<optimised out>)
    at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
#5  0x00007f9793693182 in start_thread (arg=0x7f97863ae700)
    at pthread_create.c:312
#6  0x00007f9791f0712d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

[Switching to thread 5 (Thread 0x7f9786baf700 (LWP 1146))]
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f979249666c in __gthread_cond_wait (__mutex=<optimised out>, 
    __cond=<optimised out>)
    at /build/buildd/gcc-4.8-4.8.2/build/x86_64-linux-gnu/libstdc++-v3/include/x86_64-linux-gnu/bits/gthr-default.h:864
#2  std::condition_variable::wait (this=<optimised out>, __lock=...)
    at ../../../../../src/libstdc++-v3/src/c++11/condition_variable.cc:52
#3  0x00007f97939ecfab in std::thread::_Impl<std::_Bind_simple<std::reference_wrapper<mir::scene::SnapshottingFunctor> ()> >::_M_run() ()
   from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
#4  0x00007f9792499bf0 in std::(anonymous namespace)::execute_native_thread_routine (__p=<optimised out>)
    at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:84
#5  0x00007f9793693182 in start_thread (arg=0x7f9786baf700)
    at pthread_create.c:312
#6  0x00007f9791f0712d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
A debugging session is active.

	Inferior 1 [process 1120] will be detached.

Quit anyway? (y or n) [answered Y; input not from terminal]