metacity crashes at shutdown with SIGSEGV

Issue

• metacity produces core file at shutdown time with stack trace like:

The backtrace looks like:

#0  0x000000000041a97b in meta_display_for_x_display (xdisplay=0x7171b0) at core/display.c:1048
#1  0x0000000000424a3b in x_io_error_handler (xdisplay=0x7171b0) at core/errors.c:265
#2  0x000000316364556e in _XIOError (dpy=0x7171b0) at XlibInt.c:3138
#3  0x000000316364d035 in process_responses (dpy=0x7171b0, wait_for_first_event=0, current_error=0x7fffffffe850, current_request=10) at xcb_io.c:240
#4  0x000000316364d5c0 in _XReply (dpy=0x7171b0, rep=0x7fffffffe8a0, extra=0, discard=1) at xcb_io.c:457
#5  0x0000003163641093 in XSync (dpy=0x7171b0, discard=1) at Sync.c:48
#6  0x000000316361fc60 in XCloseDisplay (dpy=0x7171b0) at ClDisplay.c:67
#7  0x00007ffff19a4da8 in spi_atk_bridge_exit_func () at bridge.c:656
#8  0x000000315fe35db2 in __run_exit_handlers (status=0) at exit.c:78
#9  exit (status=0) at exit.c:100
#10 0x000000315fe1ece4 in __libc_start_main (main=0x42be80 <main>, argc=1, ubp_av=0x7fffffffea68, init=<value optimized="" out="">, fini=<value optimized="" out="">, rtld_fini=<value optimized="" out="">, stack_end=0x7fffffffea58) at libc-start.c:258
#11 0x000000000040f699 in _start ()