Re: Building the igc branch on MS-Windows

[Gerd Möllmann]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> Eli Zaretskii <eliz@gnu.org> writes:
>
>>> From: Gerd Möllmann <gerd.moellmann@gmail.com>
>>> Cc: eller.helmut@gmail.com,  emacs-devel@gnu.org
>>> Date: Fri, 26 Apr 2024 12:56:29 +0200
>>> 
>>> I've meanwhile pushed something that handles the use of PVEC_OTHER in
>>> modules. Nothing done for the scroll_bar struct in w32. Caution: I
>>> remved the assert.
>>
>> This still crashes while scrolling through xdisp.c, but with a
>> different backtrace.  I've noticed that it crashes after GC kicks in
>> and releases a large amount of memory (about 100MB).  Here's the
>> backtrace:
>>
>>   Thread 1 received signal SIGSEGV, Segmentation fault.
>>   XCAR (c=0xab5ca1b) at lisp.h:751
>>   751       return lisp_h_XLP (o);
>>   (gdb) bt
>>   #0  XCAR (c=0xab5ca1b) at lisp.h:751
>>   #1  assoc_no_quit (key=<optimized out>, alist=0xab5ca1b) at fns.c:2032
>>   #2  0x00cbc12d in font_list_entities (f=0xaa1c478, spec=0xa84227d)
>>       at font.c:2795
>>   #3  0x00cbce93 in font_find_for_lface (f=<optimized out>, 
>> f@entry=0xaa1c478,
>>       attrs=<optimized out>, attrs@entry=0x743a2b0, spec=<optimized out>,
>>       spec@entry=0xa8421dd, c=<optimized out>, c@entry=-1) at font.c:3316
>
> Looks to be like something "in the font department", something related
> to fonts, contains references that are not yet traced. When a GC moves a
> lot of stuff, these references are therefore updated because they are
                                               ^^^ not updated
> not traces, therefore point to old locations, and ...