Re: Emacs 21.2 core dump in find_first_unchanged_at_end_row

[Paul Eggert]

> From: gerd.moellmann@t-online.de (Gerd Moellmann)
> Date: 29 Mar 2002 21:25:15 +0100

> > Is it possible that direct_output_for_insert was called during the
> > scenario that I describe ("C-x C-s" immediately followed by "a")?
> 
> It's hard to tell, but it could be.  Seeing that there are no
> intervals in the buffer makes it more likely.  Do you know if the
> buffer had a non-nil after-change-function?

Not sure, but I think not.  I believe the buffer was for a file that
is under VC control, but I don't think VC messes with
after-change-function.

> -- unchanged info says there are 4137 chars unchanged at the buffer
>    start, and 3936 unchanged at the end, sum 8073, and point-max (z)
>    is 8159.  This certainly doesn't fit the addition of 1 char to the
>    buffer (if that was all that happened in the buffer).

Yes, that looked weird to me as well.  My memory _could_ be wrong; or
perhaps I typed C-y or something like that by mistake; but all I remember
was typing C-x C-s a.

> Could you please try to print, in the frame for try_window_id, for
> example,
> 
>   (gdb) p *it->w->current_matrix

$1 = {pool = 0x0, rows = 0xba3000, rows_allocated = 75, nrows = 75, 
  matrix_x = 0, matrix_y = 0, matrix_w = 86, matrix_h = 75, window_left_x = 0, 
  window_top_y = 0, window_height = 923, window_width = 553, 
  window_vscroll = 0, left_margin_glyphs = 0, right_margin_glyphs = 0, 
  no_scrolling_p = 0, header_line_p = 0, method = '\000' <repeats 511 times>, 
  buffer = 0xb3e200, begv = 1, zv = 8158}