GNU bug report logs - #22287
25.1.50; Sudden jumping point in buffer

Previous Next

Full log

Message #26 received at 22287 <at> debbugs.gnu.org (full text, mbox):

From: "Stefan-W. Hahn" <stefan.hahn <at> s-hahn.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 22287 <at> debbugs.gnu.org, deng <at> randomsample.de
Subject: Re: bug#22287: 25.1.50; Sudden jumping point in buffer
Date: Tue, 5 Jan 2016 16:01:22 +0100

Mail von Eli Zaretskii, Mon, 04 Jan 2016 at 17:22:50 +0200:

Hello,

> > Date: Sun, 3 Jan 2016 21:51:04 +0100
> > From: "Stefan-W. Hahn" <stefan.hahn <at> s-hahn.de>
> > Cc: 22287 <at> debbugs.gnu.org
> > 
> > | *** sem end2: buffer intervals.c 49510->49391
> > | *** sem end2: timer nil
> > | *** sem end2: idle-timer ([nil 0 1 0 t semantic-idle-scheduler-function nil 
> > idle 0] [nil 0 60 0 t semantic-idle-scheduler-work-function nil idle 0])
> > | *** sem end2: post-command-hook (diff-post-command-hook t)
> > | *** sem end2: pre-command-hook nil
> > `----
> > 
> > When switching semantic-mode off, the error seems not to be reproducible.
> > 
> > This should it be for today.
> 
> Thank you for your efforts.

You'r welcome.

> It strikes me that a much more efficient way of finding who moves
> point would be by setting a watchpoint on that buffer's value of
> point, with commands like this:
> 
>  xbacktrace
>  continue
>  end
> 
> Then, whenever point changes in that buffer, you should see a Lisp
> backtrace which will show the offending code.
> 
> Let me know if you need further help with setting up such a watchpoint
> in GDB.
> 

Thanks for this hint. I wasn't aware of this, after reading the good
documentation etc/DEBUG, great possibilities.

I've sat it up and am able to define a watchpoint which calls xbacktrace. I
have to play around with it a little, because in this straight forward
atempt, it is to slow. There is no possibility to do any real keystrokes in
the debuged emacs.

So, now, playtime... :-)

With kind regards,
Stefan


-- 
Stefan-W. Hahn                          It is easy to make things.
                                        It is hard to make things simple.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.