[Trisquel-devel] dino-im segfaulting on Trisquel GNU/Linux 12.0

[Xavier Del Campo Romero]

Hi,

For the record, the same issue is also breaking the guitarix package. 
Whenever the "Pool" option is selected, Guitarix segfaults inside the 
same function in libpango.

Similarly to Dino, adding the missing null pointer check I mentioned 
earlier fixes the issue.

> the fact that it is choking on a font definition may suggest that the 
> client
> expects some specific font to be installed that is not installed (ie: the
> client package has an undeclared dependency on some font package) 

I think so, too, but I do not know which package it could be. Curiously 
enough, adding the null pointer not only fixes the issue, but also seems 
to introduce no regressions at all, neither on Dino or Guitarix.

Best regards,

Xavi

On 25/5/25 21:40, Xavier Del Campo Romero wrote:
> Hi Bill,
>
> Thank you for the quick reply. Find attached the complete (gzipped) 
> backtrace as a text file.
>
> Having another look at this issue, I can see 
> pango_language_get_default was not to blame, but still 
> |pango_font_default_has_char is passing a null pointer to 
> ||pango_coverage_get without null pointer checks.|
>
> I have also uploaded the (gzipped) core file into my web server:
>
> https://slcl.privatedns.org/public/b0a324c64bd97e1bc4c8e2b0d1067f9b
>
> Thank you again for your help.
>
> Best regards,
>
> Xavi
>
> On 25/5/25 21:20, bill-auger wrote:
>> On Sun, 25 May 2025 20:49:57 +0200 Xavier wrote:
>>> (gdb) bt
>>> #0  pango_coverage_get (coverage=0x0, index=84) at 
>>> ../pango/pango-coverage.c:183
>>> #1  0x00007ffff6db44fc in pango_font_default_has_char 
>>> (font=<optimized out>, wc=84) at ../pango/fonts.c:1795
>> it would be helpful to show the complete un-edited back-trace - that 
>> incomplete
>> back-trace suggests that pango is not the problem - pango (stack 
>> frame #0 and
>> #1) has received a NULL from its caller (not shown) - more likely, 
>> the NULL
>> originates from the client (dino?) and may be evident in the lower 
>> stack frames
>>
>> the fact that it is choking on a font definition may suggest that the 
>> client
>> expects some specific font to be installed that is not installed (ie: 
>> the
>> client package has an undeclared dependency on some font package)
>
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