SQL> startupOn Linux x86_64 restarting the cluster would resolve this error.
ORACLE instance started.
Total System Global Area 6413680640 bytes
Fixed Size 2171672 bytes
Variable Size 1107299560 bytes
Database Buffers 5284823040 bytes
Redo Buffers 19386368 bytes
ORA-00600: internal error code, arguments: [kccsbck_first], [1], [3224794587],
[], [], [], [], [], [], [], [], []
More information on metalink note 157536.1 ORA-600 [kccsbck_first] - What to Check