(gdb) bt
#0  0x00002ac4a8e8cac7 in kill () from /lib/libc.so.6
#1  0x000000000040b7af in restore_real_vroot_handler (sig=6) at windows.c:728
#2  <signal handler called>
#3  0x00002ac4a8e8c7e9 in raise () from /lib/libc.so.6
#4  0x00002ac4a8e8dbce in abort () from /lib/libc.so.6
#5  0x000000000040d525 in resize_screensaver_window (si=0x7fff02d76720)
    at windows.c:1605
#6  0x0000000000410ba5 in sleep_until_idle (si=0x7fff02d76720, until_idle_p=1)
    at timers.c:1043
#7  0x0000000000407aa2 in main_loop (si=0x7fff02d76720) at xscreensaver.c:1144
#8  0x00000000004085a3 in main (argc=1, argv=0x7fff02d76ae8)
    at xscreensaver.c:1452
(gdb) print nscreens
No symbol "nscreens" in current context.
(gdb) print si->nscreens
No symbol "si" in current context.
(gdb)