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Description of problem:
I have my machines set to automatically update from RHN using up2date.

I am using up2date-4.2.38-1

rpm -q up2date
rpmdb: Program version 4.2 doesn't match environment version
error: db4 error(22) from dbenv->open: Invalid argument
error: cannot open Packages index using db3 - Invalid argument (22)
error: cannot open Packages database in /var/lib/rpm
package up2date is not installed

Version-Release number of selected component (if applicable):
up2date-4.2.38-1 rpm-4.2.3-13

How reproducible:
Always

Steps to Reproduce:
1. Have RHEL3 machines with full pre U4 update
2. Set machine to automatically update from RHN
3. The machine will not complete U4 update owing to error on rpm db
    

Actual Results:  rpm -q up2date
rpmdb: Program version 4.2 doesn't match environment version
error: db4 error(22) from dbenv->open: Invalid argument
error: cannot open Packages index using db3 - Invalid argument (22)
error: cannot open Packages database in /var/lib/rpm
package up2date is not installed


Expected Results:  rpm -q rpm
rpm-4.2.3-13

Additional info:

To fix the problem remove the following files:
/var/lib/rpm/__db.00[1,2,3]