Eli Zaretskii дµÀ:
> Are you saying that without tabbar.el it doesn't hang?  If so, what is
> tabbar.el?  I don't see it in the CVS.
Yes, it happened only when I loaded tabbar. The previous ntemacs23 long
time ago would not hangs. I don't remember the exact date. (Maybe the
one on the ntemacs.sf.net ?)

I attached the tabbar.el file. That's not a part of cvs emacs now.

> 
> I'm still fuzzy about the specific sequence of commands that causes
> hanging.  Could you please show a detailed list of commands you typed
> to get Emacs hang?
I have the following keybinding setting in .emacs file:
(global-set-key [(control \`)] 'tabbar-forward-group)
(global-set-key [(control tab)] 'tabbar-forward-tab)
(global-set-key [(shift tab)] 'tabbar-backward-tab)

The hanging is happened sometimes, when I used C-~ or C-TAB to switch
buffer which has some chinese text. Seldom C-x b.

> 
> There's no need to copy the binary, just go to the src directory and
> type something like
> 
>   gdb ../bin/emacs.exe
> 
> This assumes that you have run "make install" which placed the
> emacs.exe binary in the bin subdirectory of the root of the Emacs
> tree.

I configured with --prefix arg, so the emacs.exe will be copied to
another directory far way from this bin subdir. I will configure without
it next time, and I can use this handy command line. :)

And how can I go back to the gdb when emacs hanged ?
I pressed C-x C-z and C-g serval times in emacs, and nothing happened.