Repair Windows Error 0x000000C7    |    STOP 0x000000C7    |    TIMER_OR_DPC_INVALID


STOP 0x000000C7 : TIMER_OR_DPC_INVALID

STOP Errors are usually the result of a hardware malfunction or device driver issue. It is also possible to receive a Blue Screen Error due to bad system memory, malfunctioning power supply, components overheating, or hardware overclocked beyond its specification. In older versions of the Windows OS you may also receive Blue Screen Errors due to incompatible DLL files.

Since the only option when receiving a Blue Screen Error is to reboot, any unsaved data is lost. With that in mind, it is very important to eliminate these errors to protect your data.

Basic Troubleshooting

Troubleshooting STOP Errors can be a difficult and time consuming process. Try these basic steps to fix your own Blue Scree Error. We hope it will help you avoid an expensive service call and provide a rewarding experience of solving the problem on your own.

Advanced Troubleshooting

The following details are for advanced users. These are provided for your convenience and may help those with advanced knowledge discover the root cause of their STOP Error.


Stop 0xC7: TIMER_OR_DPC_INVALID

The TIMER_OR_DPC_INVALID stop error code has a value of 0x000000C7. This is issued if a kernel timer or delayed procedure call (DPC) is found somewhere in memory where it is not permitted.

Parameters

The following parameters are displayed on the blue screen.

Parameter 1Parameter 2Parameter 3Parameter 4Cause of error
0x0Address of the timer objectStart of memory range being checked End of memory range being checkedThe timer object was found in a block of memory where a timer object is not permitted. .
0x1Address of the DPC objectStart of memory range being checkedEnd of memory range being checkedThe DPC object was found in a block of memory where a DPC object is not permitted.
0x2Address of the DPC routineStart of memory range being checkedEnd of memory range being checkedThe DPC routine was found in a block of memory where a DPC object is not permitted.
0x3Address of the DPC objectProcessor numberNumber of processors in the systemThe processor number for the DPC object is not correct.
0x4Address of the DPC routineThe thread’s APC disable count before the kernel calls the DPC routineThe thread’s APC disable count after the DPC routine is calledThe thread’s APC disable count was changed during DPC routine execution.

The APC disable count is decremented each time a driver calls KeEnterCriticalRegion, FsRtlEnterFileSystem, or acquires a mutex.

The APC disable count is incremented each time a driver calls KeLeaveCriticalRegion, KeReleaseMutex, or FsRtlExitFileSystem.



0x5Address of the DPC routineThe thread’s APC disable count before the kernel calls the DPC routineThe thread’s APC disable count after the DPC routine is calledThe thread’s APC disable count was changed during the execution of timer DPC routine.

The APC disable count is decremented each time a driver calls KeEnterCriticalRegion, FsRtlEnterFileSystem, or acquires a mutex.

The APC disable count is incremented each time a driver calls KeLeaveCriticalRegion, KeReleaseMutex, or FsRtlExitFileSystem.



Cause

This condition is usually caused by a driver failing to cancel a timer or DPC before freeing the memory where it resides.

Resolving the Problem

If you are the driver writer, use the information obtained through this stop error code to fix the bugs in your code.

If you are a system administrator, you should unload the driver if the problem persists.

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