5 Replies Latest reply on Dec 31, 2014 12:57 PM by kevin_intel

    i7-3612QE Kernel Panic and shut down

    ejo4041

      I have an i7-3612Qe system that has been giving kernel panics when running a certain application pretty consistently after a couple minutes.  After the kernel panic, the machine reboots.  When I turn off turbo mode in the BIOS, the panics happen less frequently.  Other BIOS settings are all default, no overclocking or anything fancy.

       

      -Can be reproduced by running streaming application using ~250% CPU, temps are a little high, they float around 68-71 degrees

      -sysbench runs fine with 8 threads, throttles CPU up to ~800%, no kernel panics, temps remain below 70 degrees

      -MemTest did not report any errors

      -Intel Processor Diagnotic tool passed

      -Tried swapping RAM

      -Happens on all of our machines, not just a single processor (possibly eliminates it being a bad single proc)

       

      -Able to mitigate most of the kernel panics and reboots by disabling Turbo mode (this is unacceptable, just including this for debugging purposes)

      -Also able to mitigate kernel panics and reboots by changing the cpu frequency sacling_governor to conservative, from ondemand.  Conservative should "gracefully increase and decreases the CPU speed

      rather than jumping to max speed the moment there is any load on the CPU" (https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt)

       

      Here is what I could copy down from the kernel panic on the monitor, sometimes the messages vary slightly, bu the TSC and PROCESSOR messages are almost always the same.

       

      [Hardware Error]:  TSC 6e496d96062

      [Hardware Error]:  PROCESSOR 0:306a9 TIME 1418929330 SOCKET 0 APIC 3 microcode 12

      [Hardware Error]:  Run the above through 'mcelog --ascii'

      [Hardware Error]:  CPU 0: Machine Check Exception: 5 Bank 4: b200000000100402

      [Hardware Error]:  RIP !INEXACT! 10:<ffffffff811ee04c> {intel_idle+0xb9/0x119}

      [Hardware Error]:  TSC 148c99828a0

      [Hardware Error]:  PROCESSOR 0:306a9 TIME 1418929330 SOCKET 0 APIC 3 microcode 12

      [Hardware Error]:  Run the above through 'mcelog --ascii'

      [Hardware Error]:  Some CPUs didn't answer in synchronization

      [Hardware Error]:  Machine check:  Processor context corrupt

      Kernel panic - not synching: Fatal machine check on current CPU

      Pid: 0, comm: swapper/3 Tained: P  M   0 3.2.0-4-amd64 #1 Debian 3.2.51-1

      Call Trace: ...

       

      Also, here is a post from superuser on some suggestions that I tried: cpu - Kernel Panic from overheating? - Super User

       

      Any ideas for what to try next?