@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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