Re: [Bug 45621] Kernel ooops: BUG: unable to handle kernel paging request at 000000080000001c

[Gordan Bobic <gordan@bobich.net>]

On 08/06/2012 11:14 PM, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=45621
>
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> --- Comment #6 from markus.doits@googlemail.com  2012-08-06 22:14:42 ---
> Just ran memtest for 3+ hours, 3 passes finished successfully. I know, longer
> is better, but cannot run it longer atm (since it's a server with crucial
> infrastructure). System is not overclocked or so, everything default.

memtest86 is completely useless at finding marginal memory. It'll only 
typically find a problem if there is a properly, permanently dead or 
stuck bit in the RAM.

If Windows is an option temporarily for testing use OCCT. If it isn't, 
I've found something like this to work pretty well for finding CPU and 
memory stability issues:

#####
# Assuming your /dev/shm is mounted on tmpfs - make sure it's big
# enough. Adjust count= accordingly
dd if=/dev/urandom bs=1M count=1024 of=/dev/shm/test

# Run one instance of this per CPU thread

#!/bin/bash

sum=`sha512sum /tmp/test`

while (/bin/true); do
   echo -n .
   sum2=`sha512sum /tmp/test`
   if [ "$sum" != "$sum2" ]; then
     echo “”
     echo “Error detected. $sum != $sum2″
     exit
   fi
done
#####

That should be a lot better at finding CPU/cache/MCH/RAM issues.

Gordan
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