@paolo: I don't think the memtester -p test is relevant: when using the -p 
option with the whole memory address-able by the kernel you can expect some 
kernel memory corruption (which you did verify actually):
Here is the memtester man entry for the -p option:
      -p PHYSADDR
              tells  memtester  to  test  a  specific  region  of  memory  
starting at physical address PHYSADDR (given in hex), by
              mmap(2)ing /dev/mem.  This is mostly of use to hardware 
developers, for testing memory-mapped I/O devices  and  simi‐
              lar.   Note  that  the memory region will be overwritten during 
testing, so it is not safe to specify memory which is
              allocated for the system or for other applications; doing so will 
cause them to crash.  If you absolutely must test a
              particular region of actual physical memory, arrange to have that 
memory allocated by your test software, and hold it
              in this allocated state, then run memtester on it with this 
option.

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https://bugs.launchpad.net/bugs/633227

Title:
  instabilities with highmem activated

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