I was able to easily reproduce it by running 'make check'. The first
test case (gcore) reliably fails with either a system hang or an MCA.
Bisect shows that it was introduced by the following commit:
62eede62dafb4a6633eae7ffbeb34c60dba5e7b1 is the first bad commit
Author: Hugh Dickins <email@example.com>
Date: Mon Sep 21 17:03:34 2009 -0700
mm: ZERO_PAGE without PTE_SPECIAL
Reinstate anonymous use of ZERO_PAGE to all architectures, not just to
those which __HAVE_ARCH_PTE_SPECIAL: as suggested by Nick Piggin.
Contrary to how I'd imagined it, there's nothing ugly about this, just a
zero_pfn test built into one or another block of vm_normal_page().
But the MIPS ZERO_PAGE-of-many-colours case demands is_zero_pfn() and
my_zero_pfn() inlines. Reinstate its mremap move_pte() shuffling of
ZERO_PAGEs we did from 2.6.17 to 2.6.19? Not unless someone shouts for
that: it would have to take vm_flags to weed out some cases.
I also checked SLES11 SP1, but this issue was not reproducible. I went
through the config differences & found that the relevant difference is
PAGE_SIZE. For whatever reason, 64KB pages (which SLES uses) masks the
issue, while 16KB (Debian) does not.
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