.
Thread 4 (Thread 0x7fbf9323a700 (LWP 1362)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fbf9e70166c in std::condition_variable::wait(std::unique_lock<std::mutex>&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#2  0x00007fbf9fc57fab 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
No symbol table info available.
#3  0x00007fbf9e704bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#4  0x00007fbf9f8fe182 in start_thread (arg=0x7fbf9323a700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7fbf9323a700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140460784068352, 7770933148039761251, 0, 0, 140460784069056, 140460784068352, -7734720422239285917, -7734693107166491293}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007fbf9e17212d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 3 (Thread 0x7fbf92238700 (LWP 1364)):
#0  0x00007fbf9e164ddd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fbf9bc41fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007fbf9bc420ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fbf9ee8a9ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#4  0x00007fbf9ee3c96b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#5  0x00007fbf9ee430e1 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#6  0x0000000000423071 in SystemCompositor::qt_main(int, char**) ()
No symbol table info available.
#7  0x00007fbf9e704bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#8  0x00007fbf9f8fe182 in start_thread (arg=0x7fbf92238700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7fbf92238700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140460767282944, 7770933148039761251, 0, 0, 140460767283648, 140460767282944, -7734718228584739485, -7734693107166491293}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#9  0x00007fbf9e17212d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 2 (Thread 0x7fbf91a37700 (LWP 3163)):
#0  0x00007fbf97361e81 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#1  0x00007fbf973b1022 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#2  0x00007fbf9737a010 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#3  0x00007fbf97220d7a in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#4  0x00007fbf9fc0c324 in mir::compositor::GLRenderer::GLRenderer(mir::geometry::Rectangle const&) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#5  0x00007fbf9fc0d5c2 in mir::compositor::GLRendererFactory::create_renderer_for(mir::geometry::Rectangle const&) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#6  0x00007fbf9fc09be8 in mir::compositor::DefaultDisplayBufferCompositorFactory::create_compositor_for(mir::graphics::DisplayBuffer&) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#7  0x00007fbf9fc0ee39 in std::thread::_Impl<std::_Bind_simple<std::reference_wrapper<mir::compositor::CompositingFunctor> ()> >::_M_run() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#8  0x00007fbf9e704bf0 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#9  0x00007fbf9f8fe182 in start_thread (arg=0x7fbf91a37700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7fbf91a37700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140460758890240, 7770933148039761251, 0, 0, 140460758890944, 140460758890240, -7734714929512985245, -7734693107166491293}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#10 0x00007fbf9e17212d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 1 (Thread 0x7fbfa01227c0 (LWP 1342)):
#0  0x00007fbf9e0adf79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 1342
        selftid = 1342
#1  0x00007fbf9e0b1388 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 23936776, 140460999046487, 140458315481093, 0, 140460970702952, 140460966796584, 140460970702952, 23936776, 21526384, 140460999075093, 140461001025416, 18446744073709551615, 1, 140461001027792, 26714464}}, sa_flags = 10, sa_restorer = 0x7fbfa01227c0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fbf9e6b36b5 in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#3  0x00007fbf9e6b1836 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#4  0x00007fbf9e6b08f9 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#5  0x00007fbf9e6b14aa in __gxx_personality_v0 () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#6  0x00007fbf9e44d043 in ?? () from /lib/x86_64-linux-gnu/libgcc_s.so.1
No symbol table info available.
#7  0x00007fbf9e44d567 in _Unwind_Resume () from /lib/x86_64-linux-gnu/libgcc_s.so.1
No symbol table info available.
#8  0x00007fbf9fc51889 in mir::scene::SessionManager::close_session(std::shared_ptr<mir::frontend::Session> const&) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#9  0x00000000004295ac in SystemCompositorShell::close_session(std::shared_ptr<mir::frontend::Session> const&) ()
No symbol table info available.
#10 0x00007fbf9fc178e4 in mir::frontend::SessionMediator::~SessionMediator() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#11 0x00007fbf9fc1d192 in mir::frontend::detail::ProtobufMessageProcessor::~ProtobufMessageProcessor() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#12 0x00007fbf9fc23a3a in mir::frontend::detail::SocketSession::~SocketSession() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#13 0x00007fbf9fc23643 in std::_Rb_tree<int, std::pair<int const, std::shared_ptr<mir::frontend::detail::SocketSession> >, std::_Select1st<std::pair<int const, std::shared_ptr<mir::frontend::detail::SocketSession> > >, std::less<int>, std::allocator<std::pair<int const, std::shared_ptr<mir::frontend::detail::SocketSession> > > >::_M_erase(std::_Rb_tree_node<std::pair<int const, std::shared_ptr<mir::frontend::detail::SocketSession> > >*) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#14 0x00007fbf9fc2287f in mir::frontend::ProtobufSessionCreator::~ProtobufSessionCreator() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#15 0x00007fbf9fbe9429 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#16 0x00007fbf9fc1fac8 in mir::frontend::BasicConnector::~BasicConnector() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#17 0x00007fbf9fc1fc64 in mir::frontend::PublishedSocketConnector::~PublishedSocketConnector() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#18 0x00007fbf9fbed822 in mir::DisplayServer::~DisplayServer() () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#19 0x00007fbf9fbe9170 in mir::run_mir(mir::ServerConfiguration&, std::function<void (mir::DisplayServer&)>) () from /usr/lib/x86_64-linux-gnu/libmirserver.so.17
No symbol table info available.
#20 0x0000000000422b9c in SystemCompositor::run(int, char**) ()
No symbol table info available.
#21 0x000000000041c0b7 in main ()
No symbol table info available.