Microsoft has released a patch for the Back-to-Back Queue Full Problem in Scsiport.sys.

If the SCSIPort driver encounters multiple busy or queue full request completions, it attempts to requeue requests in the logical unit´s Device queue. When this occurs, the SCSIPort driver expects to find the Device queue in a busy state. However, it is possible for the queue to be in a not-busy state if it was drained by delivering LuNextRequests to the miniport driver. When this error occurs, the SCSI bus resets.

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