1921                            ast_clear_flag(winner, AST_FLAG_EXCEPTION);
(gdb) frame 0
#0  0x080847d6 in ast_waitfor_nandfds_complex (c=0xb5480d70, n=2, ms=0xb5481cf8) at channel.c:1921
1921                            ast_clear_flag(winner, AST_FLAG_EXCEPTION);
(gdb) print winner
$1 = (struct ast_channel *) 0x4
(gdb) print *winner
Cannot access memory at address 0x4
(gdb)