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Bug#622570: linux-image-2.6.38-2-s390x: Unable to handle kernel pointer dereference at virtual kernel address (null)



On Thu, 14 Apr 2011 21:48:56 -0400 (EDT), Stephen Powell wrote:
> 
> The problem appears to be fixed in the latest vanilla upstream kernel
> source, which at the time of this writing is 2.6.39-rc3.
> ...

Oops!  I spoke too soon.  I checked the server before I went to bed
last night, and it was still up at that time; but when I got up this
morning I checked it again, and it had crashed during the night with
the same protection exception at the same offset in the same function.
That's the trouble with these kind of bugs.  The problem can't be
reproduced on demand; so one can never say with 100% certainty that
the bug is fixed.  One can say for sure that it isn't fixed, if the
oops occurs, but one can never say for sure that it works.  Anyway,
I guess it's time to bisect the kernel.  Oh joy.  This will take a while.

It does appear to be an s390-specific bug.

-- 
  .''`.     Stephen Powell    
 : :'  :
 `. `'`
   `-



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