bug#35429: 27.0.50; Arbitrary xdisp.c related crashes when working with overlay-using packages

[Kaushal Modi]

On Fri, Apr 26, 2019 at 3:18 AM Eli Zaretskii <eliz@gnu.org> wrote:

I doubt that the beacon package is where the bug is, so I was asking
whether a previous version of master didn't have this problem.  Or are
you saying that you only started using the beacon package a few weeks
ago?

No, I have been using beacon package for few years now.

 

> If you mean the presence of Unicode characters, then I have the unicode box drawing characters too. The Org
> file content is not 100% 8-bit ASCII.

Not even its first 2874 characters?

Those characters are in the buffer, not overlay. And they are not in the first 2874 characters.

Here are the roughly first 3000 chars of that Org buffer: http://ix.io/1Hgv

Note that at many places in that snippet, I have "=>" characters which I replace with a unicode symbol via prettify-symbols mode. E.g. "=>" is replaced with:

             position: 5434 of 8347 (65%), column: 35
            character:  (displayed as ) (codepoint 59428, #o164044, #xe824)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0xE824
               syntax: w     which means: word
             category: L:Left-to-right (strong)
             to input: type "C-x 8 RET e824"
          buffer code: #xEE #xA0 #xA4
            file code: #xEE #xA0 #xA4 (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    xft:-unknown-PragmataPro-normal-normal-normal-*-17-*-*-*-*-0-iso10646-1 (#x11D5)

Character code properties: customize what to show
  general-category: Co (Other, Private Use)
  decomposition: (59428) ('')

There are text properties here:
  fontified            nil

Would that be causing a problem?

Here is my entire set of ligature substitution using prettify-symbols: http://ix.io/1Hgw/elisp

 

By "unoptimized" I mean '-O0 -ggdb3'.  -Og still optimizes, it just
avoids optimizations that make debugging exceptionally hard.

Understood. Thank you, will build with -O0 -ggdb3 going forward.

What are the values of these:

  (gdb) p current_buffer->pt
  (gdb) p current_buffer->pt_byte
  (gdb) p current_buffer->text->gpt
  (gdb) p current_buffer->text->gpt_byte
  (gdb) p current_buffer->begv
  (gdb) p current_buffer->begv_byte
  (gdb) p current_buffer->zv
  (gdb) p current_buffer->zv_byte

(gdb) p current_buffer->pt
$1 = 1406
(gdb) p current_buffer->pt_byte
$2 = 1418
(gdb) p current_buffer->text->gpt
$3 = 1
(gdb) p current_buffer->text->gpt_byte
$4 = 1
(gdb) p current_buffer->begv
$5 = 1
(gdb) p current_buffer->begv_byte
$6 = 1
(gdb) p current_buffer->zv
$7 = 20122
(gdb) p current_buffer->zv_byte
$8 = 20804
(gdb)

 Thank you.