System hangs on boot when reserving memory in RHEL 7

Solution Verified - Updated -

Issue

  • Adding memmap parameter causes the system to hang on boot but removing the parameter allows the system to boot
  • Adding a sane memmap parameter with '!' or '$' character causes the system to hang on boot
  • System hangs on boot with a blinking cursor or the following messages
early console in setup code
Probing EDD (edd=off to disable)... ok
  • System panics on boot with Kernel panic - not syncing: Cannot find place for new RAMDISK of size #########

Environment

  • Red Hat Enterprise Linux 7
  • Hardware/Hypervisor independent

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