I'm encountered the same issue, also on linux.
My specs:
I was able to play the game until yesterday where I added the Tracking Station Evolved mod which put my game in the perpetual loading screen when I try to access either the tracking station or the V.A.B.
Trying to get to the main menu does also freeze me to death during the loading screen. Monitoring the RAM usage shows my pc getting emptied of free ram until it freezes (which has been happened but not at the point of freezing the game indefinitely)
Removing the newer mod doesn't change. I also purged all mod and reinstalled most of them but I do still encounter the issues.
Weirdly enough, I was able to play normally (with occasional freezes) until I a) updated CKAN and installed the Tracking Station Evolved mod.
Currents Mods below. With those I can access the space center, the science building and the astronaut complex.
Here the suspected leak which the KSPCF mod seems to be aware:
I was playing with these mod for approx 1 months without any issues a part of the occasional crash until yesterday
