Simultaneous migrate_pages() system call trigger panic trigger: unable to handle kernel paging request on queue_pages_range()

Issue

• Simultaneous hugepage migration via migrate_pages() system call triggers panic:

  BUG: unable to handle kernel paging request at ffffea0003fbf000
  IP: [<ffffffff811be335>] queue_pages_range+0x5b5/0x710
  PGD 47ffd5067 PUD 47ffd4067 PMD 0
  Oops: 0000 [#1] SMP
  -----8<------
  Call Trace:
  [<ffffffff811be509>] migrate_to_node+0x79/0xe0
  [<ffffffff811be808>] do_migrate_pages+0x268/0x2d0
  [<ffffffff811beb77>] SYSC_migrate_pages+0x307/0x340
  [<ffffffff811bebce>] SyS_migrate_pages+0xe/0x10
  [<ffffffff81655fc9>] system_call_fastpath+0x16/0x1b