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Running memtest from the grub menu. The display looks okay except there is nothing moving as I expect to see. The only action is the red plus sign in the upper left.

There was a beep as the test started but no other indicator.

I'm looking into this because of 

kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000

Which others have reported as a bug but which has not been listed as a bug as far as I can tell.

In at least one report this turned out to be a bad memory card. Could be. This is a 10-year old PC that has three memory upgrades using three different RAM vendors. The types are all the same but this could easily be a bad old card.

Stephen Boston
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  • Which version of memtest are you running? From which Ubuntu version? In my experience some non-faulty machines are not compatible with modern memtest, but memtest from 16.04 or 14.04 works as expected here. – N0rbert Jun 02 '20 at 21:48
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    Go to https://www.memtest86.com/ and download/run their free memtest to test your memory. Get at least one complete pass of all the 4/4 tests to confirm good memory. This may take many hours to complete. – heynnema Jun 02 '20 at 22:02
  • @N0rbert It's a 10-year old PC running 20.04. Whatever memtest is released with the current update. I'll try one of the older versions. The BIOS self test passes the memory series but fails an old data drive. – Stephen Boston Jun 02 '20 at 23:32
  • @heynnema As far as I can tell from the documentation, the memtest offered here does not work with old BIOS systems. Only with UEFI. Am I misreading the docs? – Stephen Boston Jun 02 '20 at 23:38
  • Many computers let you boot into BIOS and test RAM. – WinEunuuchs2Unix Jun 03 '20 at 00:32
  • True. But I believe that they do have an older version available on the web site too. – heynnema Jun 03 '20 at 03:02

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