.
Thread 6 (LWP 2439):
#0  0x00007fd560b130bd in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007fd5613a678f in socket_do_iteration () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#2  0x00007fd5613a53fe in _dbus_transport_do_iteration () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#3  0x00007fd56138e164 in _dbus_connection_do_iteration_unlocked () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#4  0x00007fd56138e321 in _dbus_connection_flush_unlocked () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#5  0x00007fd56138eae1 in _dbus_connection_block_pending_call () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#6  0x00007fd56138f11a in dbus_connection_send_with_reply_and_block () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#7  0x00007fd56138aee8 in dbus_bus_register () from /tmp/apport_sandbox_FukxsO/lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#8  0x00005647edace546 in usc::DBusConnectionHandle::DBusConnectionHandle (this=0x5647ef5a4318, address=...) at ./src/dbus_connection_handle.cpp:37
        error = {<DBusError> = {name = 0x0, message = 0x0, dummy1 = 1, dummy2 = 1, dummy3 = 0, dummy4 = 0, dummy5 = 0, padding1 = 0x20}, <No data fields>}
#9  0x00005647edac2bdc in usc::UnityPowerButtonEventSink::UnityPowerButtonEventSink (this=0x5647ef5a4310, dbus_address=...) at ./src/unity_power_button_event_sink.cpp:29
No locals.
#10 0x00005647edab249e in construct<usc::UnityPowerButtonEventSink, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (this=<optimized out>, __p=<optimized out>) at /usr/include/c++/6/ext/new_allocator.h:120
No locals.
#11 construct<usc::UnityPowerButtonEventSink, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (__a=..., __p=<optimized out>) at /usr/include/c++/6/bits/alloc_traits.h:455
No locals.
#12 _Sp_counted_ptr_inplace<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (__a=..., this=0x5647ef5a4300) at /usr/include/c++/6/bits/shared_ptr_base.h:520
No locals.
#13 __shared_count<usc::UnityPowerButtonEventSink, std::allocator<usc::UnityPowerButtonEventSink>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (__a=..., this=<optimized out>) at /usr/include/c++/6/bits/shared_ptr_base.h:615
        __mem = 0x5647ef5a4300
#14 __shared_ptr<std::allocator<usc::UnityPowerButtonEventSink>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (__a=..., __tag=..., this=<optimized out>) at /usr/include/c++/6/bits/shared_ptr_base.h:1100
No locals.
#15 shared_ptr<std::allocator<usc::UnityPowerButtonEventSink>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (__a=..., __tag=..., this=<optimized out>) at /usr/include/c++/6/bits/shared_ptr.h:319
No locals.
#16 allocate_shared<usc::UnityPowerButtonEventSink, std::allocator<usc::UnityPowerButtonEventSink>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > (__a=...) at /usr/include/c++/6/bits/shared_ptr.h:620
No locals.
#17 make_shared<usc::UnityPowerButtonEventSink, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > () at /usr/include/c++/6/bits/shared_ptr.h:636
No locals.
#18 operator() (__closure=<optimized out>) at ./src/server.cpp:351
No locals.
#19 std::_Function_handler<std::shared_ptr<usc::PowerButtonEventSink>(), usc::Server::the_power_button_event_sink()::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...) at /usr/include/c++/6/functional:1726
No locals.
#20 0x00005647edab5361 in operator() (this=0x7ffe8b162400) at /usr/include/c++/6/functional:2136
No locals.
#21 operator() (make=<error reading variable: access outside bounds of object referenced via synthetic pointer>, this=0x5647ef21ecf8) at /usr/include/mircommon/mir/cached_ptr.h:41
No locals.
#22 usc::Server::the_power_button_event_sink (this=0x5647ef21ec50) at ./src/server.cpp:351
No locals.
#23 0x00005647edab6470 in operator() (__closure=<optimized out>) at ./src/server.cpp:299
No locals.
#24 std::_Function_handler<std::shared_ptr<mir::input::EventFilter>(), usc::Server::the_screen_event_handler()::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...) at /usr/include/c++/6/functional:1726
No locals.
#25 0x00005647edab43b9 in operator() (this=0x7ffe8b1624e0) at /usr/include/c++/6/functional:2136
No locals.
#26 operator() (make=<error reading variable: access outside bounds of object referenced via synthetic pointer>, this=0x5647ef21ecb8) at /usr/include/mircommon/mir/cached_ptr.h:41
No locals.
#27 usc::Server::the_screen_event_handler (this=0x5647ef21ec50) at ./src/server.cpp:302
No locals.
#28 0x00005647edabf646 in usc::SystemCompositor::<lambda()>::operator()(void) const (__closure=0x5647ef2258f0) at ./src/system_compositor.cpp:118
        vendor = <optimized out>
        renderer = <optimized out>
        version = <optimized out>
        composite_filter = {<std::__shared_ptr<mir::input::CompositeEventFilter, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x7ffe8b1625b0, _M_refcount = {_M_pi = 0x7ffe8b1625c0}}, <No data fields>}
        this = 0x7ffe8b163060
        __PRETTY_FUNCTION__ = "usc::SystemCompositor::run()::<lambda()>"
#29 0x00007fd562117637 in operator() () at /usr/include/c++/6/functional:2136
        __args#0 = @0x7ffe8b162e90: {p = {_M_b = {_M_p = 0x5647ef2272c0}}}
        this = 0x7ffe8b162f70
#30 mir::run_mir(mir::ServerConfiguration&, std::function<void (mir::DisplayServer&)>, std::function<void (int)> const&) (config=..., init=..., terminator=...) at ./src/server/run_mir.cpp:109
        server_ptr = 0x7ffe8b162e90
        main_loop = {<No data fields>}
        fatal_error_strategy = {old_fatal_error_handler = 0x7fd561ea85a0 <mir::fatal_error_abort(char const*, ...)>}
        server = {p = {_M_b = {_M_p = 0x5647ef2272c0}}}
        concurrent_calls = {<No data fields>}
        raii = {deleter = {<No data fields>}, owner = true}
#31 0x00007fd562125026 in mir::Server::run() (this=0x5647ef21ec58) at ./src/server/server.cpp:453
        emergency_cleanup = {<No data fields>}
        composite_event_filter = {<No data fields>}
#32 0x00005647edabef25 in usc::SystemCompositor::run (this=0x7ffe8b163060) at ./src/system_compositor.cpp:127
No locals.
#33 0x00005647edab09a2 in main (argc=11, argv=0x7ffe8b1631f8) at ./src/main.cpp:32
        config = {<std::__shared_ptr<usc::Server, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x5647ef21ec50, _M_refcount = {_M_pi = 0x5647ef21ec40}}, <No data fields>}
        system_compositor = {server = {<std::__shared_ptr<usc::Server, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x5647ef21ec50, _M_refcount = {_M_pi = 0x5647ef21ec40}}, <No data fields>}, dm_connection = {<std::__shared_ptr<usc::DMConnection, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x5647ef5b0070, _M_refcount = {_M_pi = 0x5647ef5b0060}}, <No data fields>}, spinner = {<std::__shared_ptr<usc::Spinner, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x5647ef234c20, _M_refcount = {_M_pi = 0x5647ef234c10}}, <No data fields>}, screen = {<std::__shared_ptr<usc::Screen, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x5647ef5b0800, _M_refcount = {_M_pi = 0x5647ef5b07f0}}, <No data fields>}, screen_event_handler = {<std::__shared_ptr<mir::input::EventFilter, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}, unity_display_service = {<std::__shared_ptr<usc::UnityDisplayService, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x5647ef5b1000, _M_refcount = {_M_pi = 0x5647ef5b0ff0}}, <No data fields>}, unity_input_service = {<std::__shared_ptr<usc::UnityInputService, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}, dbus_service_thread = {<std::__shared_ptr<usc::DBusConnectionThread, (__gnu_cxx::_Lock_policy)2>> = {_M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}}
.
Thread 5 (LWP 2445):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fd5599d3583 in cnd_wait (mtx=0x5647ef250720, cond=0x5647ef250748) at ../../../../../include/c11/threads_posix.h:159
No locals.
#2  pipe_semaphore_wait (sema=0x5647ef250720) at ../../../../../src/gallium/auxiliary/os/os_thread.h:259
No locals.
#3  thread_function (init_data=init_data@entry=0x5647ef250678) at ../../../../../src/gallium/drivers/llvmpipe/lp_rast.c:805
        task = 0x5647ef250678
        rast = 0x5647ef250660
        thread_name = "llvmpipe-0\000`\325\177\000"
        fpstate = <optimized out>
#4  0x00007fd5599d33e7 in impl_thrd_routine (p=<optimized out>) at ../../../../../include/c11/threads_posix.h:87
        pack = {func = 0x7fd5599d34d0 <thread_function>, arg = 0x5647ef250678}
#5  0x00007fd5619dd70a in start_thread (arg=0x7fd556938700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fd556938700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140554257270528, 6529053918658814005, 0, 140731231902607, 140554257271232, 140554257270528, -6543318127746752459, -6543421527854030795}, 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"
#6  0x00007fd560b1f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 4 (LWP 2446):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fd5599d3583 in cnd_wait (mtx=0x5647ef250888, cond=0x5647ef2508b0) at ../../../../../include/c11/threads_posix.h:159
No locals.
#2  pipe_semaphore_wait (sema=0x5647ef250888) at ../../../../../src/gallium/auxiliary/os/os_thread.h:259
No locals.
#3  thread_function (init_data=init_data@entry=0x5647ef2507e0) at ../../../../../src/gallium/drivers/llvmpipe/lp_rast.c:805
        task = 0x5647ef2507e0
        rast = 0x5647ef250660
        thread_name = "llvmpipe-1\000`\325\177\000"
        fpstate = <optimized out>
#4  0x00007fd5599d33e7 in impl_thrd_routine (p=<optimized out>) at ../../../../../include/c11/threads_posix.h:87
        pack = {func = 0x7fd5599d34d0 <thread_function>, arg = 0x5647ef2507e0}
#5  0x00007fd5619dd70a in start_thread (arg=0x7fd556137700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fd556137700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140554248877824, 6529053918658814005, 0, 140731231902607, 140554248878528, 140554248877824, -6543317028771995595, -6543421527854030795}, 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"
#6  0x00007fd560b1f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 3 (LWP 2447):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fd5610aa52c in __gthread_cond_wait (__mutex=<optimized out>, __cond=__cond@entry=0x5647ef5a13a0) at /build/gcc-6-tPAoOr/gcc-6-6.2.0/build/x86_64-linux-gnu/libstdc++-v3/include/x86_64-linux-gnu/bits/gthr-default.h:864
No locals.
#2  std::condition_variable::wait (this=this@entry=0x5647ef5a13a0, __lock=...) at ../../../../../src/libstdc++-v3/src/c++11/condition_variable.cc:53
        __e = <optimized out>
#3  0x00007fd56215664b in operator() (this=0x5647ef5a1360) at ./src/server/scene/threaded_snapshot_strategy.cpp:58
        lock = {_M_device = 0x5647ef5a1378, _M_owns = true}
#4  __invoke_impl () at /usr/include/c++/6/functional:218
No locals.
#5  __invoke () at /usr/include/c++/6/functional:260
No locals.
#6  operator() () at /usr/include/c++/6/functional:474
No locals.
#7  _M_invoke () at /usr/include/c++/6/functional:1400
        this = <optimized out>
#8  operator() () at /usr/include/c++/6/functional:1389
        this = <optimized out>
#9  std::thread::_State_impl::_M_run (this=<optimized out>) at /usr/include/c++/6/thread:196
No locals.
#10 0x00007fd5610b050f in std::execute_native_thread_routine (__p=0x5647ef5a1670) at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:83
        __t = {_M_t = {<std::_Tuple_impl<0ul, std::thread::_State*, std::default_delete<std::thread::_State> >> = {<std::_Tuple_impl<1ul, std::default_delete<std::thread::_State> >> = {<std::_Head_base<1ul, std::default_delete<std::thread::_State>, true>> = {<std::default_delete<std::thread::_State>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, std::thread::_State*, false>> = {_M_head_impl = 0x5647ef5a1670}, <No data fields>}, <No data fields>}}
#11 0x00007fd5619dd70a in start_thread (arg=0x7fd5556fe700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fd5556fe700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140554238158592, 6529053918658814005, 0, 140731231905599, 140554238159296, 140554238158592, -6543324341490687947, -6543421527854030795}, 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"
#12 0x00007fd560b1f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 2 (LWP 2448):
#0  0x00007fd560b1f6a3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00005647edac999f in boost::asio::detail::epoll_reactor::run (this=0x5647ef5b02d0, block=block@entry=true, ops=...) at /usr/include/boost/asio/detail/impl/epoll_reactor.ipp:392
        timeout = <optimized out>
        events = {{events = 1, data = {ptr = 0x5647ef5b0328, fd = -279248088, u32 = 4015719208, u64 = 94866958385960}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}} <repeats 127 times>}
        num_events = <optimized out>
        check_timers = <optimized out>
#2  0x00005647edac528b in do_run_one (ec=..., this_thread=..., lock=..., this=0x5647ef5b01b0) at /usr/include/boost/asio/detail/impl/task_io_service.ipp:356
        on_exit = {task_io_service_ = 0x5647ef5b01b0, lock_ = 0x7fd554281bd0, this_thread_ = 0x7fd554281c50}
        more_handlers = <optimized out>
#3  run (ec=..., this=0x5647ef5b01b0) at /usr/include/boost/asio/detail/impl/task_io_service.ipp:149
        this_thread = {<boost::asio::detail::thread_info_base> = {<boost::asio::detail::noncopyable> = {<No data fields>}, reusable_memory_ = 0x0}, private_op_queue = {<boost::asio::detail::noncopyable> = {<No data fields>}, front_ = 0x0, back_ = 0x0}, private_outstanding_work = 0}
        ctx = {<boost::asio::detail::noncopyable> = {<No data fields>}, key_ = 0x5647ef5b01b0, value_ = 0x7fd554281c50, next_ = 0x0}
        lock = {<boost::asio::detail::noncopyable> = {<No data fields>}, mutex_ = @0x5647ef5b01e0, locked_ = false}
        n = <optimized out>
#4  run (this=<optimized out>) at /usr/include/boost/asio/impl/io_service.ipp:59
        ec = {m_val = 0, m_cat = 0x7fd5619d50c8 <boost::system::system_category()::system_category_const>}
#5  operator() (__closure=<optimized out>) at ./src/asio_dm_connection.cpp:54
No locals.
#6  _M_invoke<> (this=<optimized out>) at /usr/include/c++/6/functional:1400
No locals.
#7  operator() (this=<optimized out>) at /usr/include/c++/6/functional:1389
No locals.
#8  std::thread::_State_impl<std::_Bind_simple<usc::AsioDMConnection::start()::<lambda()>()> >::_M_run(void) (this=<optimized out>) at /usr/include/c++/6/thread:196
No locals.
#9  0x00007fd5610b050f in std::execute_native_thread_routine (__p=0x5647ef5afe40) at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:83
        __t = {_M_t = {<std::_Tuple_impl<0ul, std::thread::_State*, std::default_delete<std::thread::_State> >> = {<std::_Tuple_impl<1ul, std::default_delete<std::thread::_State> >> = {<std::_Head_base<1ul, std::default_delete<std::thread::_State>, true>> = {<std::default_delete<std::thread::_State>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, std::thread::_State*, false>> = {_M_head_impl = 0x5647ef5afe40}, <No data fields>}, <No data fields>}}
#10 0x00007fd5619dd70a in start_thread (arg=0x7fd554282700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fd554282700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140554216679168, 6529053918658814005, 0, 140731231904735, 140554216679872, 140554216679168, -6543321642103742411, -6543421527854030795}, 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"
#11 0x00007fd560b1f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 1 (LWP 2449):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
        set = {__val = {0, 94866956166992, 94866954848128, 0, 140554442511935, 140554426502628, 0, 140554449711440, 140554079844592, 94866955867504, 140554084057584, 140554450493280, 140554330831244, 140554453466036, 5, 0}}
        pid = <optimized out>
        tid = <optimized out>
#1  0x00007fd560a4e3ea in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 140554450493280, 94866954877808, 2, 0, 67, 140554084057584, 140554450493280, 140554426503564, 1, 1, 140554429900624, 1, 140554208272832, 140554208286464, 1}}, sa_flags = 1622339462, sa_restorer = 0x7fd560dd96e0 <stderr>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fd561ea8681 in mir::fatal_error_abort(char const*, ...) (reason=0x7fd55af5f98c "Failed to schedule page flip") at ./src/common/fatal/fatal.cpp:43
        args = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 0x7fd553a80a50, reg_save_area = 0x7fd553a80980}}
#3  0x00007fd55af575bd in ?? () from /tmp/apport_sandbox_FukxsO/usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.10
No symbol table info available.
#4  0x00007fd56217ce09 in mir::compositor::CompositingFunctor::operator()() (this=0x5647ef5b0840) at ./src/server/compositor/multi_threaded_compositor.cpp:143
        delay = <optimized out>
        pending = <optimized out>
        lock = {_M_device = 0x5647ef5b0878, _M_owns = false}
        compositors = {<No data fields>}
        disp_listener = {<No data fields>}
        display_registration = {deleter = {__this = 0x5647ef5b0840, __disp_listener = @0x7fd553a80ab0}, owner = true}
        compositor_registration = {deleter = {__this = 0x5647ef5b0840, __compositors = @0x7fd553a80b00}, owner = true}
#5  0x00007fd5621d02b9 in operator() () at /usr/include/c++/6/functional:2136
No locals.
#6  execute (this=0x7fd553a80c70) at ./src/server/thread/basic_thread_pool.cpp:40
No locals.
#7  operator() (this=0x5647ef5b0970) at ./src/server/thread/basic_thread_pool.cpp:91
        task = {task = {_M_invoker = 0x7fd562161860 <_M_invoke>}, promise = {_M_future = {<No data fields>}, _M_storage = {_M_t = {<No data fields>}}}, task_exception = {_M_exception_object = 0x0}}
        lock = {_M_device = 0x5647ef5b09c8, _M_owns = false}
#8  __invoke_impl () at /usr/include/c++/6/functional:218
No locals.
#9  __invoke () at /usr/include/c++/6/functional:260
No locals.
#10 operator() () at /usr/include/c++/6/functional:474
No locals.
#11 _M_invoke () at /usr/include/c++/6/functional:1400
        this = <optimized out>
#12 operator() () at /usr/include/c++/6/functional:1389
        this = <optimized out>
#13 _M_run (this=<optimized out>) at /usr/include/c++/6/thread:196
No locals.
#14 0x00007fd5610b050f in std::execute_native_thread_routine (__p=0x5647ef5afe80) at ../../../../../src/libstdc++-v3/src/c++11/thread.cc:83
        __t = {_M_t = {<std::_Tuple_impl<0ul, std::thread::_State*, std::default_delete<std::thread::_State> >> = {<std::_Tuple_impl<1ul, std::default_delete<std::thread::_State> >> = {<std::_Head_base<1ul, std::default_delete<std::thread::_State>, true>> = {<std::default_delete<std::thread::_State>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, std::thread::_State*, false>> = {_M_head_impl = 0x5647ef5afe80}, <No data fields>}, <No data fields>}}
#15 0x00007fd5619dd70a in start_thread (arg=0x7fd553a81700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fd553a81700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140554208286464, 6529053918658814005, 0, 140731231903967, 140554208287168, 140554208286464, -6543311747035963339, -6543421527854030795}, 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"
#16 0x00007fd560b1f0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.