(gdb) fdmanana 01:20:31 ~/core > gdb /opt/r14b03/lib/erlang/erts-5.8.4/bin/beam.smp core.27212 
GNU gdb 6.3.50-20050815 (Apple version gdb-1705) (Fri Jul  1 10:50:06 UTC 2011)
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This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries .... done

Reading symbols for shared libraries . done
Reading symbols for shared libraries ....................................... done
#0  0x00007fff89fb5df2 in select$DARWIN_EXTSN ()
(gdb) where
#0  0x00007fff89fb5df2 in select$DARWIN_EXTSN ()
#1  0x000000001f64e4b4 in erts_sys_main_thread () at sys.c:3036
#2  0x000000001f49740e in erl_start (argc=32, argv=0x7fff6f06b7c8) at erl_init.c:1439
#3  0x000000001f46d4e0 in main (argc=34, argv=0x7fff6f06b7c8) at erl_main.c:29
(gdb) backtrace full
#0  0x00007fff89fb5df2 in select$DARWIN_EXTSN ()
No symbol table info available.
#1  0x000000001f64e4b4 in erts_sys_main_thread () at sys.c:3036
	readfds = {
  fds_bits = {256, 0 <repeats 31 times>}
}
	res = 0
#2  0x000000001f49740e in erl_start (argc=32, argv=0x7fff6f06b7c8) at erl_init.c:1439
	i = 4
	Parg = 0x0
	envbuf = "\000??\006o?\000\000?\006o?\000\000??\006o"
	async_max_threads = 4
	ncpu = 8
	arg = 0x7fff6f06ba42 "4"
	have_break_handler = 1
	envbufsz = 21
#3  0x000000001f46d4e0 in main (argc=34, argv=0x7fff6f06b7c8) at erl_main.c:29
No locals.
(gdb)