after above action, the display is ...
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-111:**--F1 *gud* Bot L11 (Debugger:run [initializing...])---------
=== the state of gud is initializing instead of ready. after input enter key the state will change into ready.
(gdb) bt
#0 0x0000003769ecb053 in __select_nocancel () from /lib64/libc.so.6
#1 0x00000000004cf1fc in xg_select (max_fds=<value optimized out>, rfds=0x7fff8fb49240, wfds=0x0, efds=0x0, timeout=0x7fff8$
#2 0x000000000058fd5f in wait_reading_process_output (time_limit=30, microsecs=0, read_kbd=-1, do_display=1, wait_for_cell=$
#3 0x0000000000415a08 in sit_for (timeout=120, reading=1, do_display=1) at ~/emacs/trunk/src/dispnew.c:6059
#4 0x00000000004ee85a in read_char (commandflag=1, nmaps=3, maps=0x7fff8fb49800, prev_event=11611746, used_mouse_menu=0x7ff$
#5 0x00000000004efd78 in read_key_sequence (keybuf=0x7fff8fb49a20, bufsize=30, prompt=11611746, dont_downcase_last=0, can_r$
#6 0x00000000004f203f in command_loop_1 () at ~/emacs/trunk/src/keyboard.c:1618
#7 0x0000000000550250 in internal_condition_case (bfun=0x4f1e90 <command_loop_1>, handlers=11663554, hfun=0x4ec430 <cmd_err$
#8 0x00000000004ec0aa in command_loop_2 (ignore=<value optimized out>) at ~/emacs/trunk/src/keyboard.c:1341
#9 0x0000000000550347 in internal_catch (tag=<value optimized out>, func=0x4ec090 <command_loop_2>, arg=11611746) at ~/emac$
#10 0x00000000004ec263 in command_loop () at ~/emacs/trunk/src/keyboard.c:1320
#11 0x00000000004ec608 in recursive_edit_1 () at ~/emacs/trunk/src/keyboard.c:943
#12 0x00000000004ec75f in Frecursive_edit () at ~/emacs/trunk/src/keyboard.c:1005
#13 0x00000000004dff4b in main (argc=<value optimized out>, argv=0x7fff8fb4a2f8) at ~/emacs/trunk/src/emacs.c:1778