If you see “ORA-00600: internal error code, arguments: [krcpop_badfile], [], [], [], [], [], [], [], [], [], [], []” after converting your single instance database to RAC, that might be due to block change tracking still relying on a file that is not residing on a shared disk but on a local file.
Therefore, the solution is to define a new block change tracking file on a shared location:
SQL> alter database disable block change tracking;
SQL> alter database enable block change tracking using file '<shared_location>';