ORA-00600 [keltnfy-ldmInit], [46] when startup nomount

I changed the hostname of linux os a short time begore. And then,I also changed the "host=dataguard1" to "host=dg2" in listener.ora.I thought it's enough. 
then ,I did followed:
sql>startup nomount
SQL> startup
ORA-00600: internal error code, arguments: [keltnfy-ldmInit], [46], [1], [], [], [], [], []

And the alert.log show that:

  compatible               = 10.2.0.1.0
  db_file_multiblock_read_count= 16
  db_recovery_file_dest    = /opt/ora10g/flash_recovery_area
  db_recovery_file_dest_size= 2147483648
  undo_management          = AUTO
  undo_tablespace          = UNDOTBS1
  remote_login_passwordfile= EXCLUSIVE
  db_domain                =
  dispatchers              = (PROTOCOL=TCP) (SERVICE=dg1XDB)
  job_queue_processes      = 10
  background_dump_dest     = /opt/ora10g/admin/dg1/bdump
  user_dump_dest           = /opt/ora10g/admin/dg1/udump
  core_dump_dest           = /opt/ora10g/admin/dg1/cdump
  audit_file_dest          = /opt/ora10g/admin/dg1/adump
  db_name                  = dg1
  open_cursors             = 300
  pga_aggregate_target     = 16777216
  Thu Aug 19 19:53:34 2010
Errors in file /opt/ora10g/admin/dg1/udump/dg1_ora_4780.trc:
ORA-00600: internal error code, arguments: [keltnfy-ldmInit], [46], [1], [], [], [], [], []
Thu Aug 19 19:53:35 2010
USER: terminating instance due to error 600
Instance terminated by USER, pid = 4780

looking at id "336447.1" in matalink,the problem is related to getting host information.

the solution is:

1、The problem is related to getting host information

2、Check if /etc/hosts file is correctly configured

3、Check the hostname

4、Check if /etc/nodename is correctly configured

After checked the cotent of the /etc/hosts,I found the rows about that:

127.0.0.1               dataguard1 localhost.localdomain localhost
::1             localhost6.localdomain6 localhost6

change it ,and then it work well.

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