Hi all,

I think there are two issues at play here, one is the bad pmd one, and
one is the original "huge_memory: mapcount 0 page_mapcount 1".

Perhaps we could break the bad pmd issue out into a different LP bug?

People with the original bug - was anyone able to verify if this
happened on a more recent kernel? My understanding of mm/huge_memory.c
is that it was significantly refactored after 4.4, so I would be
interested to hear if that makes the issue go away.

I think disabling transparent huge pages on boot should also make the
issue go away if anyone is able to try that?

Regards,
Daniel

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Title:
  kernel BUG at /build/linux-lts-xenial-gUF4JR/linux-lts-
  xenial-4.4.0/mm/huge_memory.c:1931!

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