Windows driver verifier windows 7

In Windows 7, Driver Verifier provides checks for queued spin locks, these checks resemble those provided to spin locks in earlier Windows versions. These checks include the following:. Checking for obviously incorrect pointer values, such as a user-mode virtual address that is used as a spin lock address. This information appears when you use the! In Windows 7, Driver Verifier provides the following additional information that is useful for debugging:.

The log contents are displayed by using the! This information can be useful for understanding scenarios in which a thread is unexpectedly running in a critical region or is trying to leave a critical region that it has left already. In earlier Windows versions, the log contained just one stack trace for each IRP that Driver Verifier forced to be pending. This was the stack trace from the time when IoCompleteRequest was called for the first time for the forced pending IRP.

Windows 7 has at least two log entries, possibly more than two, for each forced pending IRP:. You can enable Driver Verifier on both retail and checked versions of Windows. See Microsoft Knowledge Base article for information about what to consider before you enable Driver Verifier Manager on production servers. You can enable Driver Verifier by using Verifier.

You can also see Driver Verifier statistics in real time. For additional information, refer to the "Driver Verifier Manager" section of this article. Should Driver Verifier detect a violation, the standard behavior is to bugcheck the system as to provide the most information possible about debugging the issue. A system connected to a debugger will stop once a bugcheck has occurred. All Driver Verifier violations result in bug checks, the most common ones although not necessarily all of them are:.

This command will print out useful information and attempt to pinpoint the faulting driver. Debugger extensions that are specific to Driver Verifier:. Windows kernel-mode graphics drivers such as printer and display driver DLLs are restricted from calling the pool entry point directly. Rather, pool allocations are performed indirectly using graphics device driver interface DDI callbacks to Win32k.

For example, EngAllocMem is the callback that a graphics driver calls to explicitly allocate pool memory. To provide the same sort of automated testing for the graphics drivers, support for some of the Driver Verifier functions is incorporated into Win32k. However, because graphics drivers are more restricted than other kernel-mode drivers, they require only a subset of the Driver Verifier functionality. The other functionality, namely using special pool, random failure of pool allocations, and pool tracking, are supported to varying degrees in the different graphics DDI callbacks.

Random failures are supported for the following graphics DDI callback functions:. In addition, the use of special pool and pool tracking is supported for EngAllocMem. Enabling Driver Verifier for the graphics drivers is identical to the other drivers refer to the "Enabling Driver Verifier" section of this article for additional information.

Unsupported flags such as IRQL checking are ignored. In addition, you can use the! NOTE: You should only use the random allocation failure setting for robustness testing. Use of this setting may cause rendering error messages, so you should not use this setting with verification tests to check the correctness of the graphics driver's implementation for example, by comparing the graphics driver output to a reference image.

The Driver Verifier Manager tool Verifier. Start the Driver Verifier Manager by using verifier. Whenever switches are included, the command-line based version of the utility is used. For help with configuring Driver Verifier, run verifier. The Driver Status property page gives you an image of the current status of Driver Verifier. You can see what drivers the verifier detects. The status can be one of the following:. Unloaded: The driver is not currently loaded but it was loaded at least once since you restarted the computer.

Never Loaded: The driver was never loaded. This status can indicate that the driver's image file is corrupted or that you specified a driver name that is missing from the system. You can click the list header to sort the list by driver names or status. In the upper-right area of the dialog box, you can view the current types of the verification that are in effect.

The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. No jargon. Pictures helped. Didn't match my screen. Incorrect instructions. Too technical. Not enough information. Not enough pictures. Checking will take effect the next time the system is rebooted.

Added in Windows Enables the rule classes immediately without needing reboot. This option is only valid if no rule classes are already running. See the Windows 11 rule class descriptions for the rule classes capable of immediate activation. DriverList is a list of drivers by binary name, such as Driver. Use a space to separate each driver name. This parameter is applicable only if all drivers are selected for verification. Specifies the probability that Driver Verifier will fail a given allocation.

Type a number in decimal or hexadecimal to represent the number of chances in 10, that Driver Verifier will fail the allocation. Limits the allocations that Driver Verifier can fail to allocations with the specified pool tags. To list multiple pool tags, separate the tags with spaces. By default, all allocations can fail.

Limits the allocations that Driver Verifier can fail to allocations for the specified program. Type the name of an executable file. To list programs, separate the program names with spaces. Specifies the number of minutes after booting during which Driver Verifier does not intentionally fail any allocations. This delay allows the drivers to load and the system to stabilize before the test begins.

Type a number in decimal or hexadecimal. The default value is 7 minutes. Use the 0x flag to select Systematic low resources simulation option.