Hello Sebastien,

first let me thank you for your fast response!

In the course of narrowing down the problem, I moved latest 
libatk-bridge-2.0.so.0.0.0 to a dedicated new subdirectory named sav and 
installed previous version:

root@WS010:/usr/lib/x86_64-linux-gnu# dpkg -s libatk-bridge2.0-0 | grep 
-i version
Version: 2.26.2-1

Now, to reproduce the prob as requested, I renamed productive 
libatk-bridge-2.0.so.0.0.0 to  libatk-bridge-2.0.so.0.0.0.2.26.2-1 and 
created a hard link to sav/libatk-bridge-2.0.so.0.0.0 and then rebooted.

Again the X-server continuously crashed and restarted. To be able to 
login from console (Ctrl-Alt-F1), I first logged in via ssh and then 
called telinit 3.

 From the console of my lenovo T61, I called startx. The result is shown 
in the screen-dump attached. The above procedure restores the prob.

ldd returns:

root@WS010:~# ldd -r /usr/lib/x86_64-linux-gnu/libgtk-3.so.0 | grep atk
     libatk-1.0.so.0 => /usr/local/lib/libatk-1.0.so.0 (0x00007f29f0ee9000)
     libatk-bridge-2.0.so.0 => 
/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0 (0x00007f29f0eb2000)
undefined symbol: atk_component_scroll_to_point 
(/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0)
undefined symbol: atk_component_scroll_to 
(/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0)
undefined symbol: atk_text_scroll_substring_to 
(/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0)
undefined symbol: atk_text_scroll_substring_to_point 
(/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0)
undefined symbol: atk_object_get_accessible_id 
(/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0)

after restoring the 2.26.2-1 version ldd returns

root@WS010:/usr/lib/x86_64-linux-gnu# ldd -r 
/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 | grep atk
     libatk-1.0.so.0 => /usr/local/lib/libatk-1.0.so.0 (0x00007fe798180000)
     libatk-bridge-2.0.so.0 => 
/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0 (0x00007fe797f4f000)

and xserver starts as expected.

Hope that helps. Thank you for your valuable work.

Regards, Klaus


On 26.11.20 10:04, Sebastien Bacher wrote:
> Thank you for your bug report, could share a photo showing the error
> screen? xserver doesn't use atk so the error is probably in another
> component.
>
> Could you also reinstall the package see if that restores the issue and
> provide the output of
>
> $ ldd -r /usr/lib/x86_64-linux-gnu/libgtk-3.so.0 | grep atk
>
>
> ** Changed in: at-spi2-atk (Ubuntu)
>     Importance: Undecided => Low
>
> ** Changed in: at-spi2-atk (Ubuntu)
>         Status: New => Incomplete
>
-- 
Klaus Bühler

Schafstraße 16
72622 Nürtingen

Tel.: +49-7022-979780
Mobil: +49-1522-8721468


** Attachment added: "xserver-crash.png"
   
https://bugs.launchpad.net/bugs/1905560/+attachment/5438212/+files/xserver-crash.png

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Title:
  XServer Crashes with atk_component_scroll_to_point if NVIDIA Driver
  340 is Used

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