Author Topic: Kernel panic - Bad memory or bad motherboard?  (Read 111 times)

Offline alphazo

  • Full Member
  • ***
  • Posts: 107
Kernel panic - Bad memory or bad motherboard?
« on: January 05, 2017, 02:58:45 AM »
Hello,

My unRAID installation has been stable for many years, running on a C2SEA motherboard with the latest 6.2.4 release.
During the past three weeks I have two kernel panics related to USB. The first one occured once when I came back from vacation and power up the server. It did boot up correctly and the kernel panic occured about 10 minutes after the reboot. The last one occured this morning at 7:10am without anything special triggering it.
Looking at the error message it seems to be related to USB. The only USB peripherals that are actually connected are : 1) the USB flash drive running unRAID 2) UPS using the NUT extension.

Has someone seen that kind of kernel panic?
Thanks
alphazo



Well Kernel panic kicked in again an this time not related to USB.



It then became hard to just boot the server or with some weird video artifacts.



I went through a memtest campaign and found mixed results:
  • All 4 memory modules: memtest freezes after 5 minutes
  • Memory modules 1+3 installed: memtest runs fine
  • Memory modules 2+4 installed: memtest runs fine
  • Memory modules 1+2+4 installed: memtest freezes after 5 minutes
  • Memory modules 1+3+4 installed: memtest freezes after 5 minutes

Memory modules are 99U5471-002.A01LF (KVR1333D3N9K2/4G).
I'm going to run longer memtest tests and also swap memory modules around but at this point the motherboard seems to be dammaged. What's your pick?
« Last Edit: January 06, 2017, 01:43:52 AM by alphazo »

Offline alphazo

  • Full Member
  • ***
  • Posts: 107
Re: Kernel panic - Bad memory or bad motherboard?
« Reply #1 on: January 10, 2017, 01:31:04 PM »
Tested several combination but it always fails when mixing 1+3 and 2+4 banks so I ended up just keeping 4G of memory (1+3)...A little bit weird but I'm not in a mood for swapping motherboard and CPU.

Offline jonathanm

  • Hero Member
  • *****
  • Posts: 4283
Re: Kernel panic - Bad memory or bad motherboard?
« Reply #2 on: January 10, 2017, 02:19:13 PM »
Could also be power supply. The symptom of failure to run with all 4 memory slots filled is all too common with older components, as they age they lose regulation and the extra load is too much to handle. Lack of clean voltage can happen anywhere from PSU to motherboard to the RAM itself.

Offline alphazo

  • Full Member
  • ***
  • Posts: 107
Re: Kernel panic - Bad memory or bad motherboard?
« Reply #3 on: January 12, 2017, 03:05:06 AM »
@jonathanm

I tried to run Memtest with a brand new power supply and no disks spinning and it fails after 5 minutes during the test #7 [Block Move].
I also tried swapping around the memory modules but it doesn't help.