fdisk -l does not shows all devices in /proc/partitions as expected

Solution Unverified - Updated -

Issue

  • fdisk -l does not show all devices from /proc/partitions as expected
  • fdisk -l generates message as part of its output:

    Unable to read /dev/mapper/mpathNp4
    

Environment

  • Red Hat Enterprise Linux 6,7
  • device mapper multipath
  • extended partitions on multipath device

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