(gdb) bt
#0  0x00007f978eee59e5 in raise () from /lib64/libc.so.6
#1  0x00007f978eee6ee6 in abort () from /lib64/libc.so.6
#2  0x0000000000413bbf in Fluxbox::handleSignal (this=0x7a0e80, signum=11) at fluxbox.cc:917
#3  <signal handler called>
#4  focusControl (this=0x80da90, button=<value optimized out>, time=<value optimized out>, mods=<value optimized out>)
    at Screen.hh:162
#5  (anonymous namespace)::ClientMenuItem::click (this=0x80da90, button=<value optimized out>, time=<value optimized out>, 
    mods=<value optimized out>) at ClientMenu.cc:63
#6  0x00000000004bd046 in FbTk::Menu::buttonReleaseEvent (this=0x8225a0, re=...) at Menu.cc:937
#7  0x000000000045f2e7 in FbMenu::buttonReleaseEvent (this=0x8225a0, be=...) at FbMenu.cc:59
#8  0x00000000004b25d9 in FbTk::EventManager::dispatch (this=0x76eba0, win=14680243, ev=..., parent=<value optimized out>)
    at EventManager.cc:173
#9  0x0000000000414165 in Fluxbox::handleEvent (this=0x7a0e80, e=0x7fff37e9a230) at fluxbox.cc:605
#10 0x0000000000414cd1 in Fluxbox::eventLoop (this=0x7a0e80) at fluxbox.cc:529
#11 0x00000000004262a4 in main (argc=1, argv=0x7fff37e9a868) at main.cc:464