------- Comment From dougm...@us.ibm.com 2018-04-13 14:51 EDT-------
I believe that the "1" in c000200e5848b701 is a flag. The address actually used 
will be c000200e5848b700. The flags PAGE_MAPPING_ANON and/or 
PAGE_MAPPING_MOVABLE are added to page addresses, and are stripped of before 
dereferencing. If that R30 value is something like "anon_mapping = (unsigned 
long)READ_ONCE(page->mapping)" then it will contain those flags. Not sure if 
that applies to your situation or not.

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  ISST-LTE:KVM:Ubuntu1804:BostonLC:boslcp3: Host crashed & enters into
  xmon after moving to 4.15.0-15.16 kernel

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