You can configure which drivers to verify. To start Driver Verifier Manager, type verifier at a command prompt. Driver Verifier Manager is built into Windows and is available on all Windows PCs.
NETIO BSOD DRIVER IRQL WINDOWS 10 CODE
If it identifies errors in the execution of driver code, it proactively creates an exception to allow that part of the driver code to be further scrutinized. For example, Driver Verifier checks the use of memory resources, such as memory pools. Driver Verifierĭriver Verifier is a tool that runs in real time to examine the behavior of drivers. Use !memusage and to examine the general state of the system memory. Use the command lm t n to list modules that are loaded in the memory. Use the u, ub, uu (unassemble) commands to look at the code in the address which referenced the memory in parameter 4. Use the display memory commands to examine the memory referenced in command in parameter 1. Use !address and the advanced !pte command to learn more about this area of memory. Use !pool on the parameter 1 address to see whether it is paged pool. Also examine the !analyze output to see if faulting code is identified. Use ln (list nearest symbols) with parameter 4 to see the name of the function that was called. In the majority of cases of this type of bug check, the issue is not the IRQL level, but rather the memory that is being accessed.īecause this bug check is usually caused by drivers that have used improper memory addresses, use parameters 1, 3, and 4 to investigate further. For example: 0: kd> !irqlĭebugger saved IRQL for processor 0x0 - 2 (DISPATCH_LEVEL) In the debugger, run the !irql command to display information about the IRQL of a processor on the target computer before the debugger break.
To start debugging this type of bug check, examine the stack trace by using the k, kb, kc, kd, kp, kP, kv (display stack backtrace) commands. trap command to set your context to the provided address. If a trap frame is available in the dump file, use the. You can use dx (display debugger object model expression), a debugger command, to display this: dx KiBugCheckDriver. If a driver that is responsible for the error can be identified, its name is printed on the blue screen and stored in memory at the location (PUNICODE_STRING) KiBugCheckDriver. If kernel debugger is available get stack backtrace.Īrg1: fffff808add27150, memory referencedĪrg3: 0000000000000000, value 0 = read operation, 1 = write operationĪrg4: fffff808adc386a6, address which referenced memory This is usuallyĬaused by drivers using improper addresses. Interrupt request level (IRQL) that is too high. DRIVER_IRQL_NOT_LESS_OR_EQUAL (d1)Īn attempt was made to access a pageable (or completely invalid) address at an The following example is output from !analyze. The !analyze debugger extension displays information about the bug check and can be helpful in determining the root cause. Does not call any other inline functions that could be paged out.If the problem is caused by the driver that you are developing, make sure that the function that was executing at the time of the bug check is: The function was called by using a function pointer that was an invalid pointer.įor more information on Windows IRQLs, see Windows Internals 7th Edition Part 1 by Pavel Yosifovich, Mark E.
The function call was made to a function in another driver, and that driver was unloaded. The function was marked as pageable and was running at an elevated IRQL (which includes obtaining a lock). Possible causes for the page fault include the following events: This bug check is usually caused by drivers that have used improper memory addresses. This can be caused by:ĭereferencing a bad pointer (such as a NULL or freed pointer) while executing at or above DISPATCH_LEVEL.Īccessing pageable data at or above DISPATCH_LEVEL.Įxecuting pageable code at or above DISPATCH_LEVEL. Typically, when this error occurs, a driver has tried to access an address that is pageable (or that is completely invalid) while the interrupt request level (IRQL) was too high. To determine the cause requires the Windows debugger, programming experience and access to the source code for the faulting module. Use ln (list nearest symbols) on this address to see the name of the function. DRIVER_IRQL_NOT_LESS_OR_EQUAL parameters ParameterĪddress that referenced memory. If you are a customer who has received a blue screen error code while using your computer, see Troubleshoot blue screen errors.
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