ORA-00600 [kdiRelocateCommitted:DBAupd]

This error recently showed up in a 11.2.0.3.0 Enterprise Edition RDBMS on Oracle Enterprise Linux: ORA-00600: internal error code, arguments: [kdiRelocateCommitted:DBAupd], [2126573183], [], [], [], [], [], [], [], [],
[], []
Incident details in: /u01/app/oracle/diag/rdbms/ ....._ora_5642_i10412.trc

After the trace file I was able to identify which operation produced the error and identify the specific partition that had problems.  The error was triggered during a partitioned index maintenance operation:

alter index INDEX_OWNER.INDEX_NAME modify partition PART_NAME shrink space
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [kdiRelocateCommitted:DBAupd], [2063617647], [], [], [], [], [], [], [], [], [], []

The error is not documented, and so far Oracle Support doesn't have information about this error

The workaround was to rebuild the index.  After rebuilding it the same operation produced no error.