#3  0x0810ff0c in ast_dynamic_str_thread_build_va (buf=0xb639afc8, max_len=0,
    ts=0x816c8c0, append=0,
    fmt=0x8162b50 "=== ---> %sLock #%d (%s): %s %d %s %s %p (%d)\n",
    ap=0xb639afe8 "x)\026\b") at utils.c:1246
1246            res = vsnprintf((*buf)->str + offset, (*buf)->len - offset, fmt$
$1 = (struct ast_dynamic_str *) 0x8244ae8