100% CPU usage in c-mode

100% CPU usage in c-mode

[Dennis Björklund]

This bug report will be sent to the Free Software Foundation,
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Please write in English, because the Emacs maintainers do not have
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and to the gnu.emacs.bug news group.

In GNU Emacs 21.2.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-08-29 on astest

configured using `configure --host=i686-pc-linux-gnu
--build=i686-pc-linux-gnu --target=i386-redhat-linux-gnu --program-prefix=
--prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include
--libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var
--sharedstatedir=/usr/com --mandir=/usr/share/man
--infodir=/usr/share/info --with-gcc --with-pop --with-sound'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: sv_SE
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hi!

I use the emacs 21.2 that comes with rh8. Put the following c code
in a .c file and load in emacs:

--------------------------------
void f()
{
    /*
    {
{
    }
*/
  }
}

int main()
{
  g ();
}
---------------------------------

When I try to comment out the call to g in main(), then emacs freezes and
uses 100% CPU. I guess it is some elisp code in c-mode having to do with
matching parentheses or something. Comment out the line using // and it
should trigger.

I've also asked another person to reproduce it and it occurs on his system
too. His system is: GNU Emacs 21.2.1 (i386-msvc-nt5.0.2195)

Hope this is enough for you to reproduce it.

-- 
/Dennis