I have 17 tasks with the same error.
<message>exceeded elapsed time limit 10600.25 (86400.00G/0.54G)</message>
http://150.254.66.104/gaiaathome/result.php?resultid=3975201

The obvious:
Make sure you're running the latest BOINC version
Sudo Apt Update
Sudo Apt Upgrade will upgrade everything, even non-boinc, which you may not want
Sudo Apt Autoremove will cleanup some disk space
If that doesn't do it. Delete the Project and reenroll.

Less Obvious,
There's a configuration.xml in Windows versions that has a timer to extend, but I'm not sure what it's called in Linux.
If you're not concerned about heating, perhaps increase the CPU % the project is allowed.

I can say I've had 17 tasks complete tonight from Gaia 6_... so I belive the project is good.
I have older computers and there were several Intel and AMD models to get that 17.
Reading your timeout message, it was upset the tasks didn't complete in under 3 hours.
For my older equipment, it was slightly over 3 hours to complete a task.
I don't allow more than 80% CPU useage in the Boinc setup.

Good luck with your troubleshooting.

I haven't seen any more errors on 6_Gaia@home v1.00 tasks. In fact, my computers have completed 585 tasks that have validated. I'm not sure what the problem was.