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January 17th, 2018 07:00

WHEA-Logger Processor Core Internal Parity Error on 9020

  • OptiPlex 9020
  • Core i7 4790
  • Windows 10 Pro

It seems that ever since the BIOS update and patches were installed for Meltdown/Spectre, I've been getting continuous WHEA-Logger events.

A corrected hardware error has occurred.

Reported by component: Processor Core

Error Source: Corrected Machine Check

Error Type: Internal parity error

Processor APIC ID: # (this number changes)

Is there any incompatibilities with the latest BIOS and the OS patches that might cause this or is my CPU slowly dying? I ran the Intel Processor Diagnostic Tool but everything passed.

15 Posts

January 17th, 2018 15:00

Same Issue.  Dell Precision Workstations.  All 10 of them.  Blue Screen on one.

Cause:  Microsoft Meltdown and Spectre Mitigations 

Here is the Workaround - 

First make a Windows System Restore Point.

Run this script (as administrator) to disable the Meltdown and Spectre Mitigations by Microsoft - reboot required.  Save as a .bat  file:

First Determinate if you are at risk if you disable the mitigations.  Opinion:  The risk is very low for the vast majority of users.

Also determine if you only need to disable only one of the two mitigations:

0 = Both CVE-2017-5715 and CVE-2017-5754 enabled (WHEA Errors)
1 = CVE-2017-5754 Enabled Only (No WHEA Errors)
2 = CVE-2017-5715 Enabled Only (WHEA Errors)
3 =  Both Disabled (No WHEA Errors)

Note:  I have not yet tested downgrading the bios and leaving the Microsoft mitigation enabled.

To Turn it Back On, see:

Also Read Carefully:

Intel says new firmware patches trigger reboots in Haswell and Broadwell systems:

Issue:  Thousands of Event ID 19 -  random blue screens.

Event ID 19      WHEA-Logger
A corrected hardware error has occurred.
Reported by component: Processor Core
Error Source: Corrected Machine Check
Error Type: Internal parity error
Processor APIC ID: 0


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33.3K Posts

January 17th, 2018 07:00

A CPU hardware error is very possible.  I had a "WHEA" error that kept coming up on an Intel CPU (i7 3770) and it passed all hardware tests, including the Intel CPU test.  I do some PC support and repair and had spare parts.  I swapped everything except the CPU and still had the problem.  I didn't have another spare i7 3770 but I had an i5 3550 and installed that and no more problems.  I sent the i7 to Intel for warranty service and they sent a replacement i7 and I installed that.  

However, a BIOS error can also cause this. Clear the CMOS (BIOS) memory (with the PC powered off) by opening the case and removing the CR2032 CMOS Memory backup battery for AT LEAST 10 minutes.  Replace the battery and power on. If there were any customized BIOS settings they will have to be re-entered.  

Aside from the possibility of a CPU hardware problem, see this from Microsoft

January 17th, 2018 13:00

Thanks I'll give your suggestions a try.

January 18th, 2018 05:00

Thank you so much for this information! It was a little harder to find because I was restricting my searches to Dell yet these issues are happening on all other vendors systems.

2 Posts

January 20th, 2018 00:00

Does this workaround also apply to the Optiplex 9020M?

2 Posts

January 20th, 2018 21:00

I can confirm that the solution has solved the problem on my 9020M.

Kudos to Marc-CED for this solution.  Many thanks.

January 23rd, 2018 07:00

We have encountered the same issues with several OptiPlex 7020 systems. I have not yet tested the solutions on them.

1 Message

January 24th, 2018 03:00

Many thanks Marc-CED

This solution also worked for Precision M4800.



January 25th, 2018 18:00

A more user friendly way to disable and enable the Microsoft fixes for the Meltdown Spectre security bug is to download InSpectre from Gibson Research Corp. This tiny program verfies if you have the flaws, the status of your current configuration and performance impact.  It also has the ability to disable and enable from Windows the fixes Microsoft has issued.  Word of caution make sure you download this only direct from the official Gibson Research Corp. website.

15 Posts

January 30th, 2018 12:00

Microsoft now admits the bug and is offering an optional update to disable one of the mitigations:

January 30th, 2018 12:00

I think this patch does exactly what your workaround does, no?

15 Posts

January 30th, 2018 19:00

The workaround applies to all computers and servers running Windows that are still being supported by Microsoft.

4 Posts

January 30th, 2018 22:00

roll back the BIOS update. It is buggy.

1 Message

February 6th, 2018 13:00

I have been having the WHEA warnings almost non-stop, as I view the Event logs, hundreds of them.  Just this morning I had a blue screen with an IRQ_NOT_LESS_OR_EQUAL error, still looking for that one, but the WHEA warning was the last entry in the System log before this IRQ error. 

So, I checked the Registry, but I do not have those key words mentioned in the work around.  I am not using a Dell, but a Lenovo Thinkpad W541 with docking station. 

Has anyone here noticed the WHEA errors not related to the patches?  Or perhaps there are keys in some other registry folder other than what is shown on the Microsoft site linked to in Mark-CED's post on the work around?


February 7th, 2018 07:00

Ahh **bleep** - typed reply but wasn't logged in.

Afaik the registry keys are not vendor specific but rather Microsoft Windows specific. There are 3 different patches being applied - Meltdown, Spectre Variant 1 and Spectre Variant 2. Of all of these, only Variant 2 requires a vendor BIOS update which is the thing that's causing these issues. Intel released a supposed fix but these were incomplete and incompatible with many CPU's (hence the blue screens). There's also the blue screens being caused by incompatible antivirus applications ( and ( .

The latest patch disables the Variant 2 fix on the OS side, even if you have the latest BIOS update (which many were recalled).

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