How to fix "ORA-08104 : this index object 75350 is being online built or rebuilt"

$ sqlplus donghua2/donghua2

SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 18:40:36 2010

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> alter index APP_OWNER.SYS_C007740 rebuild online tablespace sec_data01;
alter index APP_OWNER.SYS_C007740 rebuild online tablespace sec_data01
*
ERROR at line 1:
ORA-08104: this index object 75350 is being online built or rebuilt

Errors in file /u01/app/oracle/admin/appprd/udump/appprd1_ora_25717.trc:
ORA-00600: internal error code, arguments: [kdtdelrow-2], [6], [6], [], [], [], [], []
ORA-01502: index 'APP_OWNER.SYS_C007740' or partition of such index is in unusable state

SQL> conn / as sysdba
Connected.
SQL> select obj#,flags from ind$ where obj#=75350;

      OBJ#      FLAGS
---------- ----------
     75350       2563

SQL> declare
  2   isclean boolean;
  3  begin
  4   isclean :=false;
  5  while isclean=false
  6  loop
  7  isclean := DBMS_REPAIR.ONLINE_INDEX_CLEAN(dbms_repair.all_index_id,dbms_repair.lock_wait);
  8   dbms_lock.sleep(10);
  9  end loop;
 10  end;
 11  /

PL/SQL procedure successfully completed.

SQL> select obj#,flags from ind$ where obj#=75350;

      OBJ#      FLAGS
---------- ----------
     75350       2051

SQL> conn donghua2/donghua2
Connected.
SQL> alter index APP_OWNER.SYS_C007740 rebuild online tablespace sec_data01;