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bug#35429: 27.0.50; Arbitrary xdisp.c related crashes when working with


From: Kaushal Modi
Subject: bug#35429: 27.0.50; Arbitrary xdisp.c related crashes when working with overlay-using packages
Date: Fri, 26 Apr 2019 14:22:51 -0400

On Fri, Apr 26, 2019 at 2:09 PM Eli Zaretskii <address@hidden> wrote:
> 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

That's strange, because the data you printed in GDB says there's at
least one non-ASCII character within the first 1406 character
positions.

The results of the gdb commands explains this confusion :)

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

Why are you using PU characters?  They will only work with specific
fonts, not in general.  I advise against that.  But I don't think this
is the reason, as no valid Unicode point should ever cause a crash.

> (gdb) p current_buffer->pt
> $1 = 1406
> (gdb) p current_buffer->pt_byte
> $2 = 1418

This is inconsistent both with the image of the buffer you posted
above and with the fact that character position 2874 corresponds to a
byte position 2874.

Yes, this mapping is only for PragmataPro font. It's just because I did not know of any other way to map to the ligature codes provided by the font.

Are you sure the current buffer is your Org buffer?

I was .. until now .. I most likely had the frame split in two windows with one showing that Org file and the other showing ascii-art-to-unicode.el.
Here is that file: http://git.savannah.gnu.org/cgit/emacs/elpa.git/tree/packages/ascii-art-to-unicode/ascii-art-to-unicode.el

And that file definitely has a lot of unicode characters in the first 2k lines.

(That ties back to the box characters which I was trying to add to the Org file.)
 
  What do the
following commands display?

 (gdb) p current_buffer->name_
 (gdb) xstring
 (gdb) fr 2
 (gdb) p w->contents
 (gdb) xtype
 (gdb) xbuffer

(gdb) p current_buffer->name_
$9 = XIL(0xc35be44)
(gdb) xstring
$10 = (struct Lisp_String *) 0xc35be40
"ascii-art-to-unicode.el"
(gdb) fr 2
#2  0x0000000000456b44 in init_iterator (address@hidden, address@hidden, charpos=2874,
    bytepos=<optimized out>, row=<optimized out>, address@hidden)
    at xdisp.c:3047
3047          eassert (charpos == BYTE_TO_CHAR (bytepos));
(gdb) p w->contents
$11 = XIL(0xc35be95)
(gdb) xtype
Lisp_Vectorlike
PVEC_BUFFER
(gdb) xbuffer
$12 = (struct buffer *) 0xc35be90
(unsigned char *) 0xb6e97a0 "ascii-art-to-unicode.el"
(gdb)

I hope this helps.

This debug is turning out to be interesting with each update :)

Thanks.

Kaushal

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