IrqlExApcLte1 rule (wdm)

The IrqlExApcLte1 rule specifies that the driver calls ExAcquireFastMutex and ExTryToAcquireFastMutex only at IRQL <= APC_LEVEL.

Driver model WDM
Bug check(s) found with this rule Bug Check 0xC4: DRIVER_VERIFIER_DETECTED_VIOLATION (0x00020005), Bug Check 0xA: IRQL_NOT_LESS_OR_EQUAL

How to test

At compile time

Run Static Driver Verifier and specify the IrqlExApcLte1 rule.

Use the following steps to run an analysis of your code:
  1. Prepare your code (use role type declarations).
  2. Run Static Driver Verifier.
  3. View and analyze the results.

For more information, see Using Static Driver Verifier to Find Defects in Drivers.

At run time

Run Driver Verifier and select the DDI compliance checking option.

Applies to

ExAcquireFastMutex ExTryToAcquireFastMutex See also

Managing Hardware Priorities Preventing Errors and Deadlocks While Using Spin Locks