I am seeing this problem on heavily utilized HP G9 servers, specifically
when the raid battery fails. The battery will fail, the chassis will
print a similar error in dmesg, and the heavily utilized process (in
this case Java/Elastic search) will stop responding. A reboot recovers
the host, the HP utilities then report the raid battery is bad. We swap
the battery, reboot the host, and it recovers.

WE've had this occurs 6 different times on 6 different boxes. The HP
G9's are known to have troublesome raid batteries, I just didn't expect
the kernel to have such an issue with it.

[Tue Oct 17 01:06:15 2017] /build/linux-EO9xOi/linux-4.4.0/mm/pgtable-
generic.c:33: bad pmd ffff88156c4320b8(000000212e6009e2)

uname -a
Linux xx 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 
x86_64 x86_64 GNU/Linux

cat /etc/issue
Ubuntu 16.04.1 LTS \n \l

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https://bugs.launchpad.net/bugs/1644056

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

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