#0  0x00007f2e0a1cd418 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
        resultvar = 0
        pid = 5174
        selftid = 5174
#1  0x00007f2e0a1cf01a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 0, 139835715160879, 139835718616384, 1, 0, 140731372605888, 140731372605824, 139835724472176, 139835729454944, 139835729454944, 1, 139835729457296, 47390832, 66, 139835729454976}}, sa_flags = 176175232, sa_restorer = 0x302f978}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f2e0a80684d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#3  0x00007f2e0a8046b6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#4  0x00007f2e0a804701 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#5  0x00007f2e0a804919 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#6  0x00007f2de90cb0ec in void boost::throw_exception<boost::bad_function_call>(boost::bad_function_call const&) () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
No symbol table info available.
#7  0x00007f2de920c6a4 in unity::lockscreen::AcceleratorController::OnActionActivated(CompAction&) () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
No symbol table info available.
#8  0x00007f2de920d5c2 in unity::lockscreen::Accelerator::KeyReleaseActivate() () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
No symbol table info available.
#9  0x00007f2de920dab8 in unity::lockscreen::Accelerator::HandleKeyRelease(unsigned int, unsigned int, unity::lockscreen::PressedState) () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
No symbol table info available.
#10 0x00007f2de920e426 in unity::lockscreen::Accelerators::HandleKeyRelease(unsigned int, unsigned int) () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
No symbol table info available.
#11 0x00007f2de921e6cd in unity::lockscreen::Shield::FindKeyFocusArea(unsigned int, unsigned long, unsigned long) () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
No symbol table info available.
#12 0x00007f2de7d7cf8e in nux::WindowCompositor::FindKeyFocusAreaFrom(nux::EventType, unsigned int, unsigned int, nux::InputArea*, nux::ObjectWeakPtr<nux::InputArea>&, nux::ObjectWeakPtr<nux::BaseWindow>&) () from /usr/lib/x86_64-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#13 0x00007f2de7d860ad in nux::WindowCompositor::KeyboardEventCycle(nux::Event&) () from /usr/lib/x86_64-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#14 0x00007f2de7d8663d in nux::WindowCompositor::ProcessEvent(nux::Event&) () from /usr/lib/x86_64-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#15 0x00007f2de7d8af09 in nux::WindowThread::DoProcessEvent(nux::Event&) () from /usr/lib/x86_64-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#16 0x00007f2de7d5c8a6 in nux::nux_event_dispatch(_GSource*, int (*)(void*), void*) () from /usr/lib/x86_64-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#17 0x00007f2e08ac205a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#18 0x00007f2e08ac2400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#19 0x00007f2e08ac2722 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#20 0x00007f2e0ab4b91f in compiz::private_screen::EventManager::startEventLoop(_XDisplay*) () from /usr/lib/x86_64-linux-gnu/libcompiz_core.so.ABI-20151010
No symbol table info available.
#21 0x00000000004017c1 in main ()
No symbol table info available.