Waiting For Ole Db Resource And Cannot Kill Process In KILLED/ROLLBACK

I have a query to refer to the data source in as400 with ODBC 'iSeries Access for Windows ODBC data source' and a linked server with 'oledb for ODBC driver' in SQL2005 (9.0.2047)

Now we got 2 problems,

1. When we refer to the view with openquery e.g select * from openquery (abc, 'select * from dates')

This query continue to run without ending. In Activity monitor, we found that it is waiting for resource ole db

2. Since the process continue to run without ending, I kill the process in activity monitor or by command 'kill'. It shows the status 'KILLED/ROLLBACK' and it returns 'SPID 197: transaction rollback in progress. Estimated rollback completion: 0%. Estimated time remaining: 0 seconds.' in 'kill 197 with STATUSONLY'



In problem 1, I found some ppl encountered the same problem (waiting for resource oledb) with openquery to different data source e.g. vfp, oracle.

In problem 2, we can't restart the sql server for clear the unkillable process

Kindly advise. Thanks in advance.