[Bug:21.4.16] regex.c and xemacs hangs.

[Stephen J. Turnbull]

>>>>> "Andrey" == Andrey Slusar <anray at inet.ua> writes:

    Andrey> If i am saved the edited text(combination C-x C-s), xemacs
    Andrey> is hang. When i'm reverting this changes, xemacs is good
    Andrey> working.

It's being looked at.  You can revert locally if you like.  However, I
can't reproduce on Linux or Mac OS X, I can find nothing wrong with
the logic.

Please be aware that XEmacs without the patch is *broken*.  The patch
fixes a real bug that causes many regexps containing shy groups to
match incorrectly.  Unfortunately there are many applications that use
shy groups; we cannot assume that they won't be present.

Until there are further reports or a developer can reproduce, the
situation is unlikely to change very quickly.

In the meantime, have you reproduced with xemacs -vanilla?  This is
very important; there is an unrelated bug that causes infloops for
regexps that specify a repeated zero-length match.  This bug is not
yet fixed.  So you may have a save-hook that invokes such a regexp.

Can you get a backtrace for the hang?

1. Set debug-on-quit on before saving, then C-g at hang should give a trace.
2. Run XEmacs under the debugger, hang XEmacs, suspend XEmacs, then use the
   debugger to get a C backtrace.
3. If 1 didn't work, then at this point "ldp" should give a backtrace,
   too.

Are you running an XEmacs built from a fresh checkout?

Is it possible that you are missing a patch?  (There were _two_
patches related to this, the first fixed most of the bug, and the
second picked up a hunk that somehow got dropped from the first
patch).

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