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  1. Joined : Nov 2014
    Posts : 26
    Win 8.1 and Win 10
       20 Sep 2015 #1

    Unexpected Kernel Mode Trap 0x7f


    I am trying to sort out my Wife's pc which has recently started having BSOD's with the message Unexpected_Kernel_Mode_Trap and error code 0x7f. It happens during quiet times when nothing is being done on the pc. I have tested the memory using the Win 10 memory tester. That comes up all clear. I tried running sfc /scannow but when it got to 100%, the BSOD occurred. This happened 3 times consecutively.
    The dump files are here.
    Attachment 38479
    Keith
    edit : Mobo Gigabyte M81M-S2H
    cpu i3-4170
    8gb ram
    Last edited by KeithR; 20 Sep 2015 at 12:21. Reason: added hardware info
      My System SpecsSystem Spec


  2. Joined : Jun 2015
    Posts : 10,900
    Windows 10 Pro / Windows 10 TP / Windows 8.1 Pro / Windows 7 Pro
       20 Sep 2015 #2

    Hi KeithR,

    The cause of the crashes is memory corruption.
    Please follow instructions below




    Unexpected Kernel Mode Trap 0x7f Diagnostic Test Unexpected Kernel Mode Trap 0x7f
     RAM TEST

    Run MemTest86+ to analyse your RAM. MemTest86+ - Test RAM - Windows 10 Forums

    Note   Note


    MemTest86+ needs to be run for at least 8 passes for conclusive results. Set it running before you go to bed and leave it overnight. We're looking for zero errors here. Even a single error will indicate RAM failure.


    Please fill in your system specs
    Please go to this site and download the tool. The tool will give you detailed information about your system specs, please fill in your system specs more completely.
    How to fill in your system specs:

      My System SpecsSystem Spec


  3. Joined : Nov 2014
    Posts : 26
    Win 8.1 and Win 10
       21 Sep 2015 #3

    Hi Axe0.
    Thanks for your response. You have confirmed my suspicions. I have now removed the memory modules and cleaned all the contacts with isopropyl. When I re-installed the memory, I took particular care about ensuring they were well seated.
    The pc has now been running (with a little light) use for about 3 hours and no BSOD's.
    I have downloaded memtest86 and it is now partway through the 1st pass. I will leave it to complete and report back.
    Many thanks for your help.
    Keith
      My System SpecsSystem Spec


  4. Joined : Jun 2015
    Posts : 10,900
    Windows 10 Pro / Windows 10 TP / Windows 8.1 Pro / Windows 7 Pro
       21 Sep 2015 #4

    Keep us posted
      My System SpecsSystem Spec


  5. Joined : Nov 2014
    Posts : 26
    Win 8.1 and Win 10
       22 Sep 2015 #5

    Well memtest ran overnight. A total of 14 passes with no errors. I booted the pc back into Windows and it ran for 5 to 6 hours just on the desktop without any BSOD's. I then opened up the windows store and tried downloading an app but the doorbell rang so I quit the store and checked the caller. Fifteen minutes later when I returned to the pc it was displaying the "Automatic Repair Your PC did not start correctly " screen. So obviously a BSOD had occurred.
    Attachment 38834
    Hope you can help.
    Keith
      My System SpecsSystem Spec


  6. Joined : Jun 2015
    Posts : 10,900
    Windows 10 Pro / Windows 10 TP / Windows 8.1 Pro / Windows 7 Pro
       22 Sep 2015 #6

    The crashes are again caused by memory_corruption.
    This is most likely caused by a bad driver.




    Unexpected Kernel Mode Trap 0x7f Diagnostic Test Unexpected Kernel Mode Trap 0x7f
     DRIVER VERIFIER

    warning   Warning
    Please make a backup of your important files and get your rescue media or create one.
    Please create a restore point.

    Please follow this tutorial to run driver verifier.

    Some windows drivers are blamed in a few crashes, but that usually means that a 3rd party driver is actually the cause.
    Driver verifier stresses your drivers and will crash your pc if any driver fails due to a violation.

    Driver verifier should be performed for a max of 48 hours, or when you have a bluescreen, whatever comes first.

    If driver verifier has found a violation and you can't get back into windows normally, try to boot into safe mode and reset in safe mode driver verifier, or in the troubleshooting options open command prompt and type verifier /reset.

    Note   Note
    Your system will act very sluggishly while driver verifier is enabled, this is normal as your drivers will be being subjected to heavy testing in order to make them crash.
      My System SpecsSystem Spec


  7. Joined : Nov 2014
    Posts : 26
    Win 8.1 and Win 10
       23 Sep 2015 #7

    Thanks once again axe0. This is going to need a bit more time potentially. I will try to get down to it in the next couple of days and report back.
    Keith
      My System SpecsSystem Spec


  8. Joined : Nov 2014
    Posts : 26
    Win 8.1 and Win 10
       26 Sep 2015 #8

    Hope we can sort it now. I ran the drive verifier as per instructions and had a BSOD within an hour.
    Attachment 39522

    Await your reply with some hope of a resolution!
    Keith
      My System SpecsSystem Spec


  9. Joined : Jun 2015
    Posts : 10,900
    Windows 10 Pro / Windows 10 TP / Windows 8.1 Pro / Windows 7 Pro
       26 Sep 2015 #9

    Both crashes are NOT caused by driver verifier

    Please download and install Speccy.
    When you have installed and opened Speccy, click on RAM and click SPD -> Slot #1 (every slot) -> Timing table, please make a screenshot of it and post it
    It looks like



    Due to a lot of activity from NTFS please check your hard drive(s).



    Unexpected Kernel Mode Trap 0x7f Diagnostics Test Unexpected Kernel Mode Trap 0x7f
     HDD TEST

    Run SeaTools to check the integrity of your HDD. http://www.sevenforums.com/tutorials...s-how-use.html

    Note   Note
    Do not run SeaTools on an SSD as the results will be invalid.


    Run chkdsk http://www.sevenforums.com/tutorials...isk-check.html

    If the results are good, please check the fragmentation of your hard drive(s)

    Please fill in your system specs
    Please go to this site and download the tool. The tool will give you detailed information about your system specs, please fill in your system specs more completely.
    How to fill in your system specs:

      My System SpecsSystem Spec


  10. Joined : Nov 2014
    Posts : 26
    Win 8.1 and Win 10
       30 Sep 2015 #10

    Hi axe0
    Sorry to be so long getting back. Partly a time problem plus wanting to see how the pc was performing.

    1st the RAM timings
    Attachment 40338

    I ran Seatools though with both drives being Western Digital I was only able to run the basic tests. But all tests passed ok. CHKDSK on the system drive reported errors which I didn't have time to investigate. However it fixed the errors and since then the pc has been very stable. Not one BSOD!
    Unless there is anything else you think worth doing, I will give it another day or two and if no problems I will mark it as solved.
    Many thanks for your help.
    Keith
      My System SpecsSystem Spec


 
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