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I also had the same issue of tracker becoming unresponsive and taking 100% CPU.
Tracker would constantly take 100% CPU, but not fill up my entire drive.
With tracker3 being stuck, other apps like Nautilus that rely on tracker would also become unresponsive. Even "tracker3 status" didn't return in any reasonable amount of time.
The issue was caused by 400k json and jpeg files in the Documents folder which I only placed there temporarily. So apparently tracker is easily overwhelmed by having too many files.
I found that when I placed the files in one of the folders
Documents, Desktop, Music, Pictures or Videos
tracker would index them while the folders
Downloads, Public and Templates
are ignored as well as any other folder that isn't created by default.
To mitigate the issue, it could be helpful to move folders with many files somewhere where they won't be indexed by tracker.
Afterwards run "tracker3 reset --filesystem --rss" to reset the index and get tracker running again.
Tracker needs to be improved so that it won't be overwhelmed by too many files.
The other apps that rely on communicating with tracker need to be changed so that the communication becomes asynchronous so that the app doesn't become unresponsive when tracker doesn't reply.