Something

(gdb) thread 21
[Switching to thread 21 (Thread 0x814e000 (runnable))]#0  0x08084f3f in __ast_cli_register (e=0x8129668, ed=0x8130a5c) at cli.c:1664
1664                    if (strncasecmp(fulle, cur->_full_cmd, len) < 0) {

(gdb) backtrace
#0  0x08084f3f in __ast_cli_register (e=0x8129668, ed=0x8130a5c) at cli.c:1664
#1  0x28372502 in poll () from /lib/libpthread.so.2
Cannot access memory at address 0x3

(gdb) p fulle
$6 = "core clear profile\000\000\000\000\000\000\000\000\000\000&#1123;8(", '\0' <repeats 12 times>, "\001\000\000\000\000?\024\b\000?\024\b\210&#45055;'\2158(4?\024\bH?\024\b\017\000\000\000?v\024\b"

(gdb) p cur->_full_cmd
$7 = 0x8145f80 "core show functions"

(gdb) p len
$8 = 19