Node shut down unexpectedly without errors

I'm syncing a full Bitcoin Knots node (not sure where to ask about this, but hoping it’s fine since it's a fork) and it seems to have shut itself down without any errors showing. Anyone know where I can find the logs to help figure out what went wrong?

you should check this file location. Although I didn't ran fork node , but you should have find debug log in the same location as bitcoin core.

If no error shows it looks like a resource exhaustion. Would you mind to share your PC specs and the current OS? Sometimes on Windows OS they terminate the program to maintain system stability only if there's a resource exhaustion. Maybe when opening Bitcoin knots it eats too much RAM that Windows forces it to terminate. Or it could be your hard drive with a bad sector. Did you recently change the DBcache? Don't just increase it to higher than your RAM; your PC might freeze, or it might close itself. You better share with us more details about your setup and bitcoin.conf file config. I just adding this directory if you can't find the debug.log

Bitcoin Knots it's not fork. It's alternative Bitcoin full node software. Aside from out of RAM/memory, there's possibility it suddenly closed itself due to something called "segmentation fault". Usually it's caused by hardware issue. IMO this one is unlikely, since usually such error would be error on both debug.log file and pop-up message (if OP use GUI rather than daemon).

Did you start it from console? If not, try it: leave the console open to see if it outputs anything there when it closes.