For these delays to be more effective, you can enable this option with other Driver Verifier options. Note The Kernel synchronization delay fuzzing option increases the probability of race conditions appearing at runtime by inserting randomized delays at various kernel API function calls. You must restart the computer to activate or deactivate the Power Framework Delay Fuzzing option. For details, see Selecting Driver Verifier Options. You can activate the Kernel synchronization delay fuzzing feature for one or more drivers by using Driver Verifier Manager or the Verifier.exe command line. Kernel synchronization delay fuzzing improves upon traditional stress testing, where the test program is run for days or even weeks in hopes of catching problems in that can occur in concurrent execution. Like the Power Framework Delay Fuzzing option, the Kernel synchronization delay fuzzing option uses an algorithm that provides help improve the chances of finding errors in drivers. When the option is selected, Driver Verifier inserts random delays at various points in the threads. Note This option is available starting with Windows 8.1.

Using this option on a large number of drivers at the same time could cause unpredictable results, and could force crashes in components unrelated to the driver(s) you are testing. This option should be used only when you are doing targeted testing of individual drivers or their attached filter drivers. The Kernel synchronization delay fuzzing option randomizes thread schedules to help detect concurrency bugs in drivers.Ĭaution This option is not intended for use when you are verifying all (or a large collection of) drivers on a computer.

This check is deprecated starting in Windows 10 Build 19042 and above

Windows kernel driver fuzzing tools