(gdb) bt
#0  0x70153164 in kill () from /lib/libc.so.6
#1  0x71a2c30c in pthread_kill () from /lib/libpthread.so.0
#2  0x71a2c65c in raise () from /lib/libpthread.so.0
#3  0x70152e40 in raise () from /lib/libc.so.6
#4  0x701542e8 in abort () from /lib/libc.so.6
#5  0x71dc06c8 in rb_bug () from /usr/lib/libruby1.8.so.1.8
#6  0x71e2af04 in ruby_posix_signal () from /usr/lib/libruby1.8.so.1.8
#7  0x71e2af04 in ruby_posix_signal () from /usr/lib/libruby1.8.so.1.8
Previous frame identical to this frame (corrupt stack?)