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

[Daniel Calcoen]

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
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