This Knowledgebase article provides information about System Crash (STOP error) 0xD1, Driver IRQL Not Less or Equal (Identifying Crashes Due to Intel PRO 100 NIC TCP Offload).
Stop Code (or Bugcheck) 0xD1 (DRIVER_IRQL_NOT_LESS_OR_EQUAL) is a very common mode of system failure. It caused by a driver accessing memory that is pageable (or completely invalid) while the IRQL is too high (greater than or equal to IRQL_DISPATCH).
If the crash has all of the following additional attributes, the issue has already been reported:
- The system is Windows 2003.
- The crash occurred during switchover or failover.
- The system is using Intel PRO 100 NICs.
This is known to happen when the Neverfail Packet Filter Driver has been left enabled on the channel NIC(s). This arises from a manual error during installation.
If this is the case, uncheck the Packet Filter Driver from these NICs. This problem is understood to result from an adverse interaction between the Packet Filter Driver and the TCP task offload features of the Intel PRO 100 NIC.
If the problem persists after removal from the Channel NIC(s), it is advised that these advanced features (which are on by default) be switched off to avoid intermittent occurrences of this problem.
These features can be found under the 'Advanced' tab of the NIC properties dialog, which is accessed under
Computer Management -> Device Manager -> Network Adapters .
Depending upon the NIC and driver combination, the relevant properties may be called any of the following:
- Offload IP Security
- Offload TCP Segmentation
- Offload TCP/IP Checksum
- IP Security
Other names may be encountered which refer to the same functionality and the NIC documentation should be consulted prior to making any changes.
If the problem persists after these remedial actions have been followed, please provide the full error information as described in Knowledgebase article #146 - 'How to Retrieve the Neverfail Heartbeat Logs and Other Useful Information for Support Purposes' and Knowledgebase article #148 - 'System Crash (STOP error), General Advice for Support Partners, Including Steps Towards Initial Diagnosis' to Neverfail Support
See Knowledgebase article #147 - 'System Crash (STOP error), General Advice for End-Users' and Knowledgebase article #148 - 'System Crash (STOP error), General Advice for Support Partners, Including Steps Towards Initial Diagnosis' for general information relating to STOP errors.