ora -600 internal error and database connectivity issue.

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-00554: initialization of internal recovery manager package failed

RMAN-04005: error from target database:

ORA-00600: internal error code, arguments: [ksm_mga_pseg_cbk_attach:map_null], [], [], [], [], [], [], [], [], [], [], []

ORA-27300: OS system dependent operation:open failed with status: 2

ORA-27301: OS failure message: No such file or directory

ORA-27302: failure occurred at: sskgm_mga_at

09-04-19 06:20:05 Alert file: /tmp/PXRPDB.rman_archivelog_backup.error_found.txt

09-04-19 06:20:05 Errors found

crsctl status res -t init

check the crsd log

/oraclebase/app/oracle/product/18.0.0/grid/log/omexd001/crsd