ORA-00600: internal error code, arguments: [kcratr1_lastbwr], [], [], [], [

Error:
SQL> startup


ORACLE instance started.

Total System Global Area 167772160 bytes
Fixed Size 1247876 bytes
Variable Size 71304572 bytes
Database Buffers 88080384 bytes
Redo Buffers 7139328 bytes
Database mounted.
ORA-00600: internal error code, arguments: [kcratr1_lastbwr], [], [], [], [],

Solution:
startup mount;

recover database;
alter system open;