Fix Error Code 0x00000020    |    Repair Windows Error 0x00000020    |    Fix Windows Registry Errors


STOP 0x00000020 : KERNEL_APC_PENDING_DURING_EXIT

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 0x20: KERNEL_APC_PENDING_DURING_EXIT

The KERNEL_APC_PENDING_DURING_EXIT stop error code has a value of 0x00000020. This indicates that an asynchronous procedure call (APC) was still pending when a thread exited.

Parameters

The following parameters are displayed on the blue screen.

ParameterDescription
1The address of the APC found pending during exit
2The thread's APC disable count
3The current IRQL
4Reserved

Cause

The key data item is the APC disable count (Parameter 2) for the thread. If the count is nonzero, it will indicate the source of the problem.

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.

Because these calls should always be in pairs, the APC disable count should be zero when a thread exits. A negative value indicates that a driver has disabled APC calls without re-enabling them. A positive value indicates that the reverse is true.

If you ever see this error, be very suspicious of all drivers installed on the machine — especially unusual or non-standard drivers.

This current IRQL (Parameter 3) should be zero. If it is not, the driver's cancellation routine may have caused this stop error code by returning at an elevated IRQL. In this case, carefully note what was running (and what was closing) at the time of the crash, and note all of the installed drivers at the time of the crash. The cause in this case is usually a severe bug in a driver.

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Fix Windows Registry Errors    |    Fix Error Code 0x00000020    |    KERNEL_APC_PENDING_DURING_EXIT