The stash file contains the master key for the Kerberos database, which is automatically created when you create a Kerberos database. If the stash file gets corrupted, you can use the stash command of the kdb5_util utility to replace the corrupted file. The only time you should need to remove a stash file is after removing the Kerberos database with the destroy command of kdb5_util. Because the stash file is not automatically removed with the database, you have to remove the stash file manually.
To remove the stash file, use the rm command:
# rm stash-file
Where stash-file is the path to the stash file. By default, the stash file is located at /var/krb5/.k5.realm.