Kdump fails to start with 'crashkernel=auto' on small RAM systems

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Issue

Kdump service cannot restart with kernel option 'crashkernel=auto' on server with less than 4G memory
..kdump service is enabled by default (but failed to start on boot), and there is a kernel option 'crashkernel=auto' on system with less than 4G memory

Environment

Red Hat Enterprise Linux (RHEL) 6

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