Running M-x gdb hangs emacs

[Zhongwei Yao]

Hi, all,

When run M-x gdb with following command:
  gdb -i=mi -x ~/.gdb/config

and the .gdb/config file are:
==config==
  set non-stop off
  file /my/path/to/exe-file
  target remote 192.168.1.2:5049
  break func_foo
==config==

emacs returns me a buffer *gud-config* with following content:
==*gud-config* buffer==
Current directory is ~/.gdb/
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-linux-gnu
--target=arm-linux-android".
For bug reporting instructions, please see:
<http://source.android.com/source/report-bugs.html>.
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.Cannot access memory at address 0x0
==*gud-config* buffer==

Then emacs will hang there.
However, I can get gdb work by running: gdb -x ~/.gdb/config in bash. It
returns:
==*gdb in bash*==
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-linux-gnu
--target=arm-linux-android".
For bug reporting instructions, please see:
<http://source.android.com/source/report-bugs.html>.
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
0xf77b6254 in ?? ()
Cannot access memory at address 0x0
Breakpoint 1 at 0xab0cd2e4: file ../../test_foo.c, line 29.
(gdb)
==*gdb in bash*==

How can get gdb also work in emacs? Thanks a lot!
--
Zhongwei