.
Thread 1 (process 18962):
#0  0x00007f0ea76377fd in ?? () from /usr/lib/libxcb.so.1
#1  0x00007f0ea7637aa7 in xcb_poll_for_event () from /usr/lib/libxcb.so.1
#2  0x00007f0ea849dd75 in ?? () from /usr/lib/libX11.so.6
#3  0x00007f0ea849dfa5 in _XReply () from /usr/lib/libX11.so.6
#4  0x00007f0ea84928aa in XSync () from /usr/lib/libX11.so.6
#5  0x0000000000405d0f in ?? ()
#6  0x00007f0ea7a671c4 in __libc_start_main () from /lib/libc.so.6
#7  0x0000000000402aa9 in ?? ()
#8  0x00007fffb0ffcae8 in ?? ()
#9  0x0000000000000000 in ?? ()