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  • Test 6 errors on specific CPU.

    When running memtest86 in order to diagnose a string of random crashes and BSoD, I noticed that regardless of RAM used (I alternated between 2), Test 6 would consistently produce errors when ran on a specific CPU core, which is CPU 6 aka Physical Core 4. The same test, when run using other cores, does not produce any errors. Therefore, is this indicative of a bad CPU core? Also all tests prior to test 6 and does not produce errors on any cores.

    Log: https://pastebin.com/GMkidSNG

  • #2
    Looking at the log it is clear that something is wrong.
    Despite the CPU looking like it is at fault, RAM sticks are easier to change, compared to the CPU. So I would still be tempted to remove one of the RAM sticks at a time and retest.

    Comment


    • #3
      I have tested each stick individually, removing one at a time. And they still show the same results, no errors up to test 6, and no errors on all but core 4.

      Comment


      • #4
        Wow, this is an interesting coincidence. I'm hitting the same problem - one specific core is failing block moves. Have you resolved it yet?

        Here's what I've done so far:
        - first memory kit worked in Windows for about a week, but showed some bluescreens after that
        - memtest86+ failed with first memory kit at this point (single cpu mode)
        - reseated CPU & RAM, no different
        - replaced RAM, different vendor also on motherboard QVL
        - passed ~12 hours of single threaded tests with memtest86+
        - wouldn't boot Windows without bugchecking
        - switched to Memtest86, ran multicore tests
        - core 2 failing a bunch of stuff on block move & moving inversions and eventually hang. Core 0 or 4 will pass alone
        - Switched motherboard settings to use just 1 CPU core - Windows boots!

        This is the strangest issue I've ever dealt with.

        I'm about to try swapping the power supply because I have a known good one available. If that fails, I'll try CPU tomorrow since I can't get another of the same board motherboard locally.

        Comment


        • #5
          For the record the CPU in the initial case as a Intel Core i7-7700HQ @ 2.80GHz and the errors where generally one or two bit errors,

          [MEM ERROR - Data] Test: 6, CPU: 6, Address: 2FCD4028, Expected: EFFFFFFF, Actual: E7FFFFFF
          [MEM ERROR - Data] Test: 6, CPU: 6, Address: 30D74F08, Expected: 00FFFF05, Actual: 0000FFBF
          [MEM ERROR - Data] Test: 6, CPU: 6, Address: 31483048, Expected: 00FFFF00, Actual: 0000BB7F
          [MEM ERROR - Data] Test: 6, CPU: 6, Address: 3154CF08, Expected: FFFE7FFF, Actual: FFFFFFFF
          [MEM ERROR - Data] Test: 6, CPU: 6, Address: 3172A188, Expected: 00FFFFF7, Actual: 0000FFFF


          Comment


          • #6
            Originally posted by patricklang View Post
            Wow, this is an interesting coincidence. I'm hitting the same problem - one specific core is failing block moves. Have you resolved it yet?

            Here's what I've done so far:
            - first memory kit worked in Windows for about a week, but showed some bluescreens after that
            - memtest86+ failed with first memory kit at this point (single cpu mode)
            - reseated CPU & RAM, no different
            - replaced RAM, different vendor also on motherboard QVL
            - passed ~12 hours of single threaded tests with memtest86+
            - wouldn't boot Windows without bugchecking
            - switched to Memtest86, ran multicore tests
            - core 2 failing a bunch of stuff on block move & moving inversions and eventually hang. Core 0 or 4 will pass alone
            - Switched motherboard settings to use just 1 CPU core - Windows boots!

            This is the strangest issue I've ever dealt with.

            I'm about to try swapping the power supply because I have a known good one available. If that fails, I'll try CPU tomorrow since I can't get another of the same board motherboard locally.
            Well, regrettably for me, this is a laptop. And most of my crashing issues was worked around by configuring windows to only use the first 3 cores. So I'd say there's probably something wrong with the fourth core?

            Comment


            • #7
              Well I guess it may be possible for certain cores to fail now. I swapped power supplies - no change. I swapped CPUs today leaving the RAM alone and it's passing with the new CPU. I have never seen a CPU fail that wasn't overclocked and overvolted.

              Before swap (Intel i7-8700)
              Last 10 Errors
              [Data Error] Test: 5, CPU: 0, Address: 2B8301074, Expected: EE56B51A, Actual: EE56B53A
              [Data Error] Test: 5, CPU: 0, Address: 2B830105C, Expected: EE56B51A, Actual: EE56B50A
              [Data Error] Test: 5, CPU: 0, Address: 2B1F41174, Expected: A6EF1BCF, Actual: A6EF1B86
              [Data Error] Test: 5, CPU: 0, Address: 2B1F41164, Expected: A6EF1BCF, Actual: A6EF1BA6
              [Data Error] Test: 5, CPU: 0, Address: 2B1F41154, Expected: A6EF1BCF, Actual: A6EF1B59
              [Data Error] Test: 5, CPU: 0, Address: 2B1F41144, Expected: A6EF1BCF, Actual: A6EF1B59
              [Data Error] Test: 5, CPU: 0, Address: 2AC561174, Expected: B711BCD2, Actual: B711BCF2
              [Data Error] Test: 5, CPU: 0, Address: 2AC56115C, Expected: B711BCD2, Actual: B711BCC2
              [Data Error] Test: 5, CPU: 0, Address: 2AFE51174, Expected: 18D96198, Actual: 18D961B8
              [Data Error] Test: 5, CPU: 0, Address: 2AFE5115C, Expected: 18D96198, Actual: 18D96188

              After swap (Intel i3-8100 - only thing in stock)
              Test # Tests Passed Errors
              Test 0 [Address test, walking ones, 1 CPU] 2/2 (100%) 0
              Test 1 [Address test, own address, 1 CPU] 2/2 (100%) 0
              Test 2 [Address test, own address] 2/2 (100%) 0
              Test 3 [Moving inversions, ones & zeroes] 2/2 (100%) 0
              Test 4 [Moving inversions, 8-bit pattern] 2/2 (100%) 0
              Test 5 [Moving inversions, random pattern] 2/2 (100%) 0
              Test 6 [Block move, 64-byte blocks] 2/2 (100%) 0
              Test 7 [Moving inversions, 32-bit pattern] 2/2 (100%) 0
              Test 8 [Random number sequence] 2/2 (100%) 0
              Test 9 [Modulo 20, ones & zeros] 2/2 (100%) 0
              Test 10 [Bit fade test, 2 patterns, 1 CPU] 2/2 (100%) 0
              Test 13 [Hammer test] 1/1 (100%) 0

              Comment


              • #8
                Here's the funny thing. I've been building and fixing PCs for 30 years. I've never seen a CPU failure either. Lots of RAM, disk failures. motherboard and PSU failures. Never a CPU. But in a single week we have 3 people in the forums saying they have CPU failures. Maybe the quality assurance processes are getting worse. Or maybe it was AMD pushing Intel into doing releases for new CPUs before they were properly tested.

                Comment


                • #9
                  Hi,
                  This morning I stared to get browsers crashes and blue screen in Win10 (64). Three times in a row after system reboot.
                  Then I've run memorytest84 7.4 and on 3th pass received CPU related errors on test 6 - attached.
                  Is this the same thing as above mention or maybe something else?

                  P.S. there is something like this in Event Viewer:
                  - System
                  - Provider
                  [ Name] Microsoft-Windows-Kernel-Power
                  [ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4}
                  EventID 41
                  Version 5
                  Level 1
                  Task 63
                  Opcode 0
                  Keywords 0x8000400000000002
                  - TimeCreated
                  [ SystemTime] 2018-01-28T11:16:47.362218800Z
                  EventRecordID 2404
                  Correlation
                  - Execution
                  [ ProcessID] 4
                  [ ThreadID] 8
                  Channel System
                  Computer DESKTOP-FFEFH35
                  - Security
                  [ UserID] S-1-5-18
                  - EventData
                  BugcheckCode 26
                  BugcheckParameter1 0x403
                  BugcheckParameter2 0xffffee0000015ee8
                  BugcheckParameter3 0x80000001e69dc867
                  BugcheckParameter4 0x0
                  SleepInProgress 0
                  PowerButtonTimestamp 0
                  BootAppStatus 0
                  Checkpoint 0
                  ConnectedStandbyInProgress false
                  SystemSleepTransitionsToOn 0
                  CsEntryScenarioInstanceId 0
                  BugcheckInfoFromEFI true
                  I would appreciate your help on this one.
                  Thank you in advance.
                  Damjan


                  Comment


                  • #10
                    Damjan,

                    At the risk of stating the obvious, your RAM errors reported in MemTest86 look like RAM errors. Replace the RAM.

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