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jfolkman
What's DOS?
Posts: 1
Registered: ‎01-11-2018
Location: US
Views: 11,071
Message 11 of 54

Re: KB4056892 multiple problems on T440s

Having the same problem (WHEA) on X240's and X1 Carbon's with Windows 10 installed.

stevey5036
Paper Tape
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Registered: ‎10-23-2013
Location: US
Views: 11,056
Message 12 of 54

Re: KB4056892 multiple problems on T440s

Had my first BSOD today on my T440p after three years of operation. Found event log flooded with WHEA-Logger events which started on 1/5 when I installed KB4056892 and updated the BIOS to 2.46. I'm going to uninstall KB4056892 for now, but what is being done to resolve this?

bak6830
Paper Tape
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Location: AT
Views: 11,055
Message 13 of 54

Re: KB4056892 multiple problems on T440s

Exactly the same problem on T440s with Bios 2.46. WHEA-Logger went wild right after the installation of KB4056892.

CrypticLottery
Token Ring
Posts: 51
Registered: ‎01-08-2018
Location: US
Views: 11,045
Message 14 of 54

Re: KB4056892 multiple problems on T440s


@ianw01 wrote:

I have a slight variation that might help narrow things down:

 

I have pretty much the same issue here on my T440s: WHEA Logger events pouring in and occasional system lockups - the screen freezes and only option is to power off.

 

However, the problems started after updating to BIOS 2.46, which I did several days after KB4056892 was already installed. So it seems that it is the combination of the two that causes the problem

 

I wish I could recall the previous BIOS version - I'm pretty sure it was in the 2.3x (i.e. between 2.30 and 2.39). I do not have any 3rd party AV - just Windows Defender. 

 

So, should I roll back the KB, or the BIOS?

 

(Win 10 Pro 64bit 1709. Most used apps: Outlook 2016, FireFox, VS2017, Slack ...)


I tried rolling back my firmware (see earlier post) to no avail. Most likely because microcode updates aren't reversable, so add the two registry values that Elgaard mentioned a few posts up.

 

This disables the patch for both meltdown flaws (hence the "3", as it is a two-bit value). You're back at risk again by choosing to do so, but we're all adults and make our own choices. And you can re-enable the Microsoft patches once there is a "v2" patch issued by Lenovo and/or Intel by deleting the two values or setting them to "0".

 

Hopefully someone from Lenovo is monitoring this thread and notifying higher-ups on this issue now.

Highlighted
CrypticLottery
Token Ring
Posts: 51
Registered: ‎01-08-2018
Location: US
Views: 11,031
Message 15 of 54

Re: KB4056892 multiple problems on T440s

So I did some experimenting with the registry values that Microsoft published to enable/disable the two meltdown flaws.

If I set FeatureSettingsOverride and FeatureSettingsOverrideMask values to '1', I get no more WHEA errors.

 

Setting these values to '1' enables the fix for CVE-2017-5754 caused NO WHEA errors

Setting these values to '2' enables the fix for CVE-2017-5715 caused WHEA errors.

 

5754 is the rouge data cache load attack and

5715 is the branch target injection attack

 

The way I came up with these values is from https://support.microsoft.com/en-us/help/4072698/windows-server-guidance-to-protect-against-the-spec..., subsection "Additional Information", Answer #9

 

FeatureSettingsOverride represents a bitmap that overrides the default setting and controls which mitigations will be disabled. Bit 0 controls the mitigation corresponding to CVE-2017-5715 and Bit 1 controls the mitigation corresponding to CVE-2017-5754. The bits are set to “Zero” to enable the mitigation and to “One” to disable the mitigation.

FeatureSettingsOverrideMask represents a bitmap mask that is used in conjunction with FeatureSettingsOverride and in this case, we use the value 3 (0x11) which indicates the first two bits that correspond to the available mitigations. This registry key is set to 3 both when we want to enable the mitigations and to disable the mitigations.

  

00 = 0 Both CVE-2017-5715 and CVE-2017-5754 enabled (WHEA Errors)
01 = 1 CVE-2017-5754 Enabled Only (No WHEA Errors)
10 = 2 CVE-2017-5715 Enabled Only (WHEA Errors)
11 = 3 (No WHEA Errors)

  

Anyway, instead of disabling BOTH fixes, just disable the fix for 5715 until a patch for the patch is released.

AndreasHue
Paper Tape
Posts: 3
Registered: ‎01-08-2018
Location: DE
Views: 11,004
Message 16 of 54

Re: KB4056892 multiple problems on T440s

I tried a clean Windows 10 Pro (1709) installation with a minimal set of drivers.

The WHEA Errors occur instantly after Windows Update has installed KB4056892.

The combination of Bios 2.46 and KB4056892 must causes the problems.


[Lenovo T440s / Windows 10 Pro (1709) 64 Bit / Bios 2.46]
 

ianw01
Token Ring
Posts: 83
Registered: ‎02-08-2011
Location: CA
Views: 10,980
Message 17 of 54

Re: KB4056892 multiple problems on T440s


@CrypticLottery wrote:

...

If I set FeatureSettingsOverride and FeatureSettingsOverrideMask values to '1', I get no more WHEA errors.

...

Confirmed. I left the KB and BIOS alone and just set both keys to 1 on my T440s. No WHEA errors, no lockups so far.

 

Will await proper fix from Lenovo and/or Microsoft.

CrypticLottery
Token Ring
Posts: 51
Registered: ‎01-08-2018
Location: US
Views: 10,652
Message 18 of 54

Re: KB4056892 multiple problems on T440s

So - looks like Intel's crapped the bed with some of their microcode patches and has requested Lenovo (and presumably all OEMs) to pull the impacted updates until Intel fixes their 'quality issue'.

 

https://support.lenovo.com/us/en/solutions/len-18282

Scroll down to the section "Withdrawn CPU Microcode Updates"

 

Oddly, the T440 and my T540 aren't part of the the withdrawl. So we wait?

MoritzRiebe
What's DOS?
Posts: 1
Registered: ‎01-13-2018
Location: DE
Views: 10,581
Message 19 of 54

Re: KB4056892 multiple problems on T440s

Well, same problem for me. W541, BIOS/UEFI 2.33, Windows 10 x64, i7-4710MQ...

Lets wait for a corrected MicroCode Update by Intel. Smiley Happy

ikar-us
What's DOS?
Posts: 1
Registered: ‎01-16-2018
Location: DE
Views: 10,171
Message 20 of 54

Re: KB4056892 multiple problems on T440s

I have the same phenomenon, and another one:

 

Together with the BIOS update came a power management driver update.

Now there are windows log messages

The speed of processor 3 in group 0 is being limited by system firmware. 

for all cores.

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