GNU bug report logs - #20802
Segfault when showing non-GTK+ tooltip

Previous Next

Full log

Message #32 received at 20802 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: tobias.getzner <at> gmx.de, 20802 <at> debbugs.gnu.org
Subject: Re: bug#20802: Segfault when showing non-GTK+ tooltip
Date: Sun, 14 Jun 2015 17:12:55 +0300

> Date: Sun, 14 Jun 2015 13:00:57 +0200
> From: martin rudalics <rudalics <at> gmx.at>
> CC: tobias.getzner <at> gmx.de, 20802 <at> debbugs.gnu.org
> 
> What happens is given in the backtraces below.  The first breakpoint is
> hit when Emacs creates the image cache for the original frame
> (f=0x13a7e00).  The second breakpoint is hit when freeing the image
> cache for the tooltip frame (f=0xe0c7a0).  This removes the image_cache
> created in make_image_cache at 0x1676f90.  The third breakpoint is the
> same as in my earlier posts.
> 
> The reason seems obvious: When the color is not defined for the tooltip
> frame we do _not_ increment the refcount of the image cache.  But we
> subsequently free the image cache in unwind_create_frame.  Bad luck.

Thanks.  Now I know why this cannot be reproduced on Windows: this is
bug#17524 coming back to haunt us.  That bug was reported on Windows,
I fixed it on Windows, then suggested a similar fix for X, but was
told it didn't help there.

So now please try making a fix on X similar to commit ebdc80316, and
if that indeed doesn't help with this crash, perhaps some simple
variation of that will.

TIA

Previous Next

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