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

SQL> startup
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1266392 bytes
Variable Size 67112232 bytes
Database Buffers 96468992 bytes
Redo Buffers 2924544 bytes
Database mounted.
ORA-00600: internal error code, arguments: [kcratr1_lastbwr], [], [], [], [],[], [], []

workaround:

Step 1:
Shutdown immediate
Step 2:
Startup mount
Step 3:
Recover database;
Step 4:
Alter database open;