how to debug a Tellico crash (core dump) ? on Ubuntu 25.10, GNOME Wayland

[Marcelin José-Marcio Martins da Cruz]

Hello,

Launching tellico with strace :

   strace tellico

may sometimes help to see which system call makes tellico crash.

May 2 cents (even less than 2).



On 1/11/26 13:14, Daniel Calcoen wrote:
> Thanks Robby,
> 
> so my saga has started ...
> 
> I've installed apport-retrace and the ubuntu sources. The machine has Mesa 
> 25.2.3-1ubuntu1 installed.
> 
>  >apport-retrace --gdb --sandbox system --cache ~/.cache/apport-retrace /var/ 
> crash/_usr_bin_tellico.1000.crash
> 
> after several can't open file
> 
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Core was generated by `/usr/bin/tellico'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x000075ac7d43216c in nv50_resource_from_memobj (screen=0x63b2ad1a1c00, 
> templ=0x7fffe4cd4ca0, pmemobj=0x63b2ad85b2c8, offset=<optimized out>)
>      at ../src/gallium/drivers/nouveau/nv50/nv50_resource.c:124
> aviso: 124    ../src/gallium/drivers/nouveau/nv50/nv50_resource.c: No existe el 
> archivo o el directorio
> [Current thread is 1 (Thread 0x75ac9e501180 (LWP 47593))]
> (gdb)
> 
> 
> so it clearly related to the video drivers ...
> 
> 
> the 124 row of nv50_resource.c (for Mesa 25.2.3) is
> 
> mt <https://elixir.bootlin.com/mesa/mesa-25.2.3/C/ident/mt>->base.domain 
> <https://elixir.bootlin.com/mesa/mesa-25.2.3/C/ident/domain>=mt <https:// 
> elixir.bootlin.com/mesa/mesa-25.2.3/C/ident/mt>->base.bo <https:// 
> elixir.bootlin.com/mesa/mesa-25.2.3/C/ident/bo>->flags&NOUVEAU_BO_APER <https:// 
> elixir.bootlin.com/mesa/mesa-25.2.3/C/ident/NOUVEAU_BO_APER>;
> 
> 
> so I need to load more sources to see if is really this line and trace the 
> bug ... will see and I'll let you know.
> 
> I also get Inkscape crashing, deb package, but I changed to the snap, which works.
> 
> All my other applications, Libreoffice, Zoom, Enpass, Ente Auth, Thunderbird, 
> Firefox, Oracle Virtualbox, Gimp, Ferdium, etc... works nicelly.
> 
> 
> Daniel
> 
> 
> El 10/1/26 a las 22:22, Robby Stephenson escribió:
>> Hi Daniel,
>>
>> On Sat, Jan 10, 2026 at 1:37 PM Daniel Calcoen<daniel.calcoen at gmail.com> wrote:
>>> after my last upgrades on Ubuntu 25.10 in my wife's machine (GNOME 49,
>>> Wayland, Linux 6.17.0'8-generic on iMac14,2 i5-4670) my Tellico 4.1.3 is
>>> crashing after starting.
>>>
>>> My 1st guess is oriented towards QT6 and problem with video.
>>>
>>> launchig from the console gives :
>>>
>>> alejandra at iMac:/var/crash$ tellico
>>> [14:01:52] WARNING GBM is not supported with the current configuration.
>>> Fallback to Vulkan rendering in Chromium.
>>> Violación de segmento (`core' generado)
>> Looking at Google responses for that error, I think you're correct
>> about  possible graphics video issue, likely related to Tellico's
>> using of the QtWebEngine (embedded Chrome)
>>
>>> I need some help/orientation on how could I debug the coredump (the basics).
>>>
>>> Do I need to install Tellico sources and compile all in my machine?
>>>
>>> Do I need to lauch the coredump via gdb ? plus something more ?
>> There's a Ubuntu-specifc page at
>> https://wiki.ubuntu.com/DebuggingProgramCrash that may help. Tellico
>> should offer to generate the core dump for you, but if the crash is
>> early in the initialization , that won't work.
>>
>> Robby