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bug#26615: Recent Emacs crashes when PC is suspended and using tabbar-ru

From: martin rudalics
Subject: bug#26615: Recent Emacs crashes when PC is suspended and using tabbar-ruler package
Date: Sun, 23 Apr 2017 11:16:32 +0200

> Martin, this seems to be due to your changes in 3fdd3bb56.  Could you
> please take a look?
> The crash is here:
>    if (f1)
>      {
>        /* Ok, we found a frame.  Store all the values.
>           last_mouse_glyph is a rectangle used to reduce the
>           generation of mouse events.  To not miss any motion
>           events, we must divide the frame into rectangles of the
>           size of the smallest character that could be displayed
>           on it, i.e. into the same rectangles that matrices on
>           the frame are divided into.  */
>        dpyinfo = FRAME_DISPLAY_INFO (f1);
>        ScreenToClient (FRAME_W32_WINDOW (f1), &pt);  <<<<<<<<<<<<<<<<<<<
>        remember_mouse_glyph (f1, pt.x, pt.y, &dpyinfo->last_mouse_glyph);
>        dpyinfo->last_mouse_glyph_frame = f1;
> So maybe this has something to d with computing f1?

Likely.  But I have no idea what went wrong here.  cwfp could obviously
be a scroll bar window but then x_any_window_to_frame shouldn't have
accepted it.  I suppose neither of these

#6  0x00007ff9ec2f6476 in ntdll!__C_specific_handler ()
   from C:\WINDOWS\SYSTEM32\ntdll.dll
#7  0x00007ff9ec30a08d in ntdll!.chkstk () from C:\WINDOWS\SYSTEM32\ntdll.dll
#8  0x00007ff9ec279c58 in ntdll!RtlLookupFunctionEntry ()
   from C:\WINDOWS\SYSTEM32\ntdll.dll
#9  0x00007ff9ec30910e in ntdll!KiUserExceptionDispatcher ()
   from C:\WINDOWS\SYSTEM32\ntdll.dll

would tell us much?  I tweaked the code a bit, maybe it helps.

Angelo please try with latest master.  If it crashes again we'll have to
dig further.


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