Re: [Devel] FreeType 2.1.3 segfaults with htst3.ttf

[Owen Taylor]

Anthony Fok <address@hidden> writes:

> Hello,
> 
> While I was trying to evaluate a Chinese TrueType font--HuaTian
> Three-step complex TTF song font (GB2312)--which, moreso than MingLiU,
> uses bytecode instructions to shape the strokes and even components of
> Chinese characters (is it the same as "recursive composite" that Owen
> referred to recently?)  

No - what I meant by recursive composite there was a font where
a glyph had itself as one of its composite components. That is,
clearly buggy fonts. The characteristic stack backtrace would
be an infinite recursion - thousands of frames of the same 
thing.

> The sample font is available for download here:
> 
>       http://www.htit.com/english/downloads.htm
>       http://www.htit.com/download/htst3.ttf
> 
> I was able to view this font with ftview1 (freetype 1.3.1) without any
> problem, but with ftview from freetype-2.1.3, a segmentation fault
> would usually occur when a Chinese character is about to be rendered
> (glyph 780 and on). However, I have to admit that It is beyond my skill
> to debug this.  :-)
> 
> I have attached two gdb backtraces for reference.

If you export the environment variable MALLOC_CHECK_=2, you might
get more meaningful backtraces .... there seems to be some memory
corruption involved.

Regards,
                                        Owen