gistfile1.rb

(gdb) bt
#0  0x00110410 in __kernel_vsyscall ()
#1  0x003c8e90 in ppoll () from /lib/libc.so.6
#2  0x009b34f8 in rb_wait_for_single_fd (fd=7, events=1, tv=0x0) at thread.c:3583
#3  0x009b3855 in rb_thread_wait_fd_rw (fd=-514) at thread.c:3422
#4  rb_thread_wait_fd (fd=-514) at thread.c:3433
#5  0x0079fce4 in rsock_s_recvfrom (sock=156152260, argc=1, argv=0xb7cd401c, from=RECV_IP) at init.c:132
#6  0x007ab006 in ip_recvfrom (argc=1, argv=0xb7cd401c, sock=156152260) at ipsocket.c:265
#7  0x009819b5 in call_cfunc_m1 (func=0x7aafe0 <ip_recvfrom>, recv=156152260, argc=1, argv=0xb7cd401c) at vm_insnhelper.c:1325
#8  0x0098722c in vm_call_cfunc_with_frame (th=0x929cbc8, reg_cfp=0xb7d53fb8, ci=<value optimized out>) at vm_insnhelper.c:1469
#9  0x0099f5c6 in vm_call_cfunc (th=0x929cbc8, cfp=0xb7d53fb8, ci=0x94a6d04) at vm_insnhelper.c:1559
#10 vm_call_method (th=0x929cbc8, cfp=0xb7d53fb8, ci=0x94a6d04) at vm_insnhelper.c:1751
#11 0x0099840d in vm_exec_core (th=0x929cbc8, initial=<value optimized out>) at insns.def:1017
#12 0x0099db27 in vm_exec (th=0x929cbc8) at vm.c:1201
#13 0x0099df77 in rb_iseq_eval_main (iseqval=155835900) at vm.c:1449
#14 0x0085ef47 in ruby_exec_internal (n=0x949ddfc) at eval.c:250
#15 0x00860be7 in ruby_exec_node (n=0x949ddfc) at eval.c:315
#16 ruby_run_node (n=0x949ddfc) at eval.c:307
#17 0x0085d371 in main (argc=2, argv=0xbfc4d294) at main.c:36

recvfrom.rb

require 'socket'
require 'fcntl'
require 'cool.io'

@bind = '127.0.0.1'
@port = '12345'

@usock = UDPSocket.new
@usock.bind(@bind, @port)
@usock.fcntl(Fcntl::F_SETFL, Fcntl::O_NONBLOCK)
@usock.recvfrom(1024)
@usock.recvfrom(1024)
@usock.recvfrom(1024)
@usock.recvfrom(1024)
@usock.recvfrom(1024)