Occasional BSOD (Kernel Security Check Failure), high CPU usage Solved

  1.    04 Jul 2018 #1

    Occasional BSOD (Kernel Security Check Failure), high CPU usage

    Hi community,
    usually I don't post in forums, but I'm afraid I'm stuck. Also, I have two issues that I believe are interrelated, so I hope I'm correct in this part of the forum:
    1) Occasional BSODs (three since 27 June)
    2) extremely high CPU usage that makes using my PC hard

    A few days ago, while working on my Lenovo T520 notebook for about two hours already, I got a Kernel Security Check Failure BSOD. After restarting, the PC worked just fine, only Windows Defender showed a faulty driver. I manually updated it (I think it was for the memory card or so) and the PC worked fine for some hours before I got another BSOD (driver verifier detected violation). However, after restart, the driver manager did not show any problems, and manually updating some third party drivers did not help, all were supposedly new. Here is a .dmp from the, as I think, second BSOD: Dropbox - 062818-27953-01.dmp

    What I did since then and what other complications occurred:
    1) Make sure Windows 10 is up to date
    2) Updating BIOS
    3) Using third party software to update all drivers automatically (15 drivers updated)
    However, after another BSOD (now Kernel Security Check Failure again), my computer is on constant high CPU usage (usually around 75%, often 100%, and it takes ages for programs to start) and I can hardly use it for work. However, there is no single process that is taking up the memory, often e.g. firefox is first with around 40 percent or so, but it seems to sum up in a weird way. (After fresh boot, not opening any programs, after some time the fan stops working and CPU is low. But that only works without opening any programs.) So I randomly did:
    4) sfc /scannow (no errors)
    5) chkdsk (no errors)
    6) windows start up repair (because I was desperate - of course nothing changed)
    7) boot in safe mode - the computer runs smooth again!
    8) do a clean boot - same problems as before

    When doing a clean boot, the services running are exactly the same as in safe mode, and still I have problems in the former but not in safe mode.
    a) What can I do to get normal CPU usage?
    b) How can I assure the BSOD does not return? I have lost some unsaved files because of this.
    Occasional BSOD (Kernel Security Check Failure), high CPU usage Attached Files
      My ComputerSystem Spec

  2. philc43's Avatar
    Posts : 3,821
    64bit Win 10 Pro ver 1809 Build 17763.253 and W10 Insider Build 18312
       04 Jul 2018 #2

    Hello Rhina,

    The successful safe mode boot indicates that this is a driver issue rather than hardware, there are more drivers that operate with a clean boot since some services start in clean boot which do not start in safe mode, e.g. the network drivers.

    When you obtained the driver verifier detected BSOD this only happens if you have Driver Verifier enabled. This is not normally enabled and as you did not tell me you enabled it I can only assume that it has always been running. This is not good for your PC and will considerably reduce its performance. Please turn Driver Verifier off for now. If you do not know how to do so then refer to this tutorial.

    Your log_collector file uploaded does not have any data, please try again and use the beta Log_collector which is provided at the end of the BSOD posting instructions - this one may work better.

    You mentioned you had used a 3rd Party Driver updater - these are notorious for introducing problems and should be avoided as they often add unwanted programs onto your system. Only update drivers from the PC manufacturer or website of the device. You need to roll back all drivers that were updated this way and try and get your device back to its earlier state. If you had a system image or backup this would be the way to do it. If not you might be able to use System Restore if it was turned on.

    We will need to wait for some more BSODs and a successful upload of the files before we can provide further help. Filling in more details in your "My Computer" section would also be useful.
      My ComputersSystem Spec

  3.    04 Jul 2018 #3

    CPU solved, now BSOD left

    Thank you, philc43

    I immediately disabled the Driver Verifier. I then restarted my PC. During shutdown, I got a new BSOD (Unexpected Kernel Mode Trap). I started and then restarted my PC again, without any BSOD. And now, it works like a charm! No high CPU usage any more. It's sometimes simple thinks like disabling the Driver Verifier that change everything. Must have overread that I need to disable it again after using it.

    I attach the now working log_connector file using the beta.

    *edit* At some point I must have started the Driver Verifier manually, forgot to mention that. As often, the problem sits in front of the PC, not inside.
    Occasional BSOD (Kernel Security Check Failure), high CPU usage Attached Files
      My ComputerSystem Spec

  4. philc43's Avatar
    Posts : 3,821
    64bit Win 10 Pro ver 1809 Build 17763.253 and W10 Insider Build 18312
       04 Jul 2018 #4

    That's good news. Run your PC for a few days and see how it goes - if you have any problems let us know.
      My ComputersSystem Spec

  5.    12 Jul 2018 #5

    Next round

    After a few days of silence, I got the next BSOD just now, this time it's a DRIVER IRQL NOT LESS OR EQUAL and the cause is a file named BthA2DP.sys (according to the blue screen notification). I attach a new diagnostic file.

    Any input? Is there an underlying problem that causes all the different kinds of BSODs?
    Occasional BSOD (Kernel Security Check Failure), high CPU usage Attached Files
      My ComputerSystem Spec

  6. philc43's Avatar
    Posts : 3,821
    64bit Win 10 Pro ver 1809 Build 17763.253 and W10 Insider Build 18312
       12 Jul 2018 #6

    My guess is that it is some type of Bluetooth driver. It looks like it is provided by Microsoft so I am not sure how you would update it except through Windows Update which is automatic.

    0: kd> lmvm BthA2DP
    Browse full module list
    start             end                 module name
    fffff800`8f010000 fffff800`8f048000   BthA2DP    (deferred)             
        Mapped memory image file: C:\ProgramData\Dbg\sym\BthA2DP.sys\6BCFA64038000\BthA2DP.sys
        Image path: \SystemRoot\system32\drivers\BthA2DP.sys
        Image name: BthA2DP.sys
        Browse all global symbols  functions  data
        Image was built with /Brepro flag.
        Timestamp:        6BCFA640 (This is a reproducible build file hash, not a timestamp)
        CheckSum:         00035D8C
        ImageSize:        00038000
        File version:     10.0.17134.111
        Product version:  10.0.17134.111
        File flags:       0 (Mask 3F)
        File OS:          40004 NT Win32
        File type:        2.0 Dll
        File date:        00000000.00000000
        Translations:     0409.04b0
        Information from resource tables:
            CompanyName:      Microsoft Corporation
            ProductName:      Microsoft® Windows® Operating System
            InternalName:     btha2dp.sys
            OriginalFilename: btha2dp.sys
            ProductVersion:   10.0.17134.111
            FileVersion:      10.0.17134.111 (WinBuild.160101.0800)
            FileDescription:  Bluetooth A2DP Driver
            LegalCopyright:   © Microsoft Corporation. All rights reserved.

    I would be temped to reinstall any Bluetooth devices to see if it makes a difference. What Bluetooth devices are you using?
      My ComputersSystem Spec

  7.    12 Jul 2018 #7

    I attached the blue tooth devices listed in the device manager. I tried to update the drivers but they were up to date already. I'm not sure which of these (except for the speakers) are safe to uninstall? Some seem to be part of the system?

    Reflecting on it, I just recently got the UE Boom speakers, and I did not have problems without them. I might try not using them for two weeks or so and see where this takes me. There are several threads in forums with bluetooth devices causing problems, although mostly there is an instant BSOD as soon as people connect the device. In my case it would be a delayed BSOD, as I get only after a few hours, if at all.
    Attached Thumbnails Attached Thumbnails BlueToothDevices.JPG  
      My ComputerSystem Spec

  8. philc43's Avatar
    Posts : 3,821
    64bit Win 10 Pro ver 1809 Build 17763.253 and W10 Insider Build 18312
       13 Jul 2018 #8

    The driver that caused the BSOD was associated with something identified as Bluetooth Stereo so I think that confirms it is due to the recent Boom speakers you added. See if there is any help from their website or via Google in case others have had problems.
      My ComputersSystem Spec

  9.    05 Aug 2018 #9

    Okay, not a single BSOD since I uninstalled the bluetooth speaker driver three weeks ago, that seems to have been the cause. I couldn't find any parallel cases on the web. Is there anything I could do in order to get around this problem? Any chance future windows version won't have this problem (i.e. waiting will help?)? It's not very urgent, but I would be nice anyway.
      My ComputerSystem Spec

  10. Ztruker's Avatar
    Posts : 7,037
    Windows 10 Pro X64 1809 17763.134
       05 Aug 2018 #10

    Try contacting the manufacturers of the UE Boom speakers. Maybe they can help?
      My ComputersSystem Spec


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