Kdump service fails if dracut option 'add_dracutmodules+=earlykdump' is set in dracut configuration file.

Issue

• Kdump service fails with an error "dracut: dracut module 'earlykdump' cannot be found or installed"

# cat /etc/dracut.conf.d/earlykdump.conf 
add_dracutmodules+=earlykdump

# kdumpctl restart
kexec: unloaded kdump kernel
Stopping kdump: [OK]
Detected change(s) in the following file(s):

  /etc/kdump.conf
Rebuilding /boot/initramfs-4.18.0-32.el8.x86_64kdump.img
dracut: dracut module 'earlykdump' cannot be found or installed.
mkdumprd: failed to make kdump initrd
Starting kdump: [FAILED]

# systemctl status kdump.service
● kdump.service - Crash recovery kernel arming
   Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2019-01-02 18:54:36 IST; 1min 22s ago
  Process: 1522 ExecStop=/usr/bin/kdumpctl stop (code=exited, status=0/SUCCESS)
  Process: 21209 ExecStart=/usr/bin/kdumpctl start (code=exited, status=1/FAILURE)
 Main PID: 21209 (code=exited, status=1/FAILURE)

Jan 02 18:54:35 rhel8.beta dracut[26937]: dracut module 'iscsi' will not be installed, because command 'iscsid' could not be found!
Jan 02 18:54:35 rhel8.beta dracut[26937]: 95nfs: Could not find any command of 'rpcbind portmap'!
Jan 02 18:54:35 rhel8.beta dracut[26937]: dracut module 'resume' will not be installed, because it's in the list to be omitted!
Jan 02 18:54:36 rhel8.beta kdumpctl[21209]: dracut: dracut module 'earlykdump' cannot be found or installed.
Jan 02 18:54:36 rhel8.beta dracut[26937]: dracut module 'earlykdump' cannot be found or installed.
Jan 02 18:54:36 rhel8.beta kdumpctl[21209]: mkdumprd: failed to make kdump initrd
Jan 02 18:54:36 rhel8.beta kdumpctl[21209]: Starting kdump: [FAILED]
Jan 02 18:54:36 rhel8.beta systemd[1]: kdump.service: Main process exited, code=exited, status=1/FAILURE
Jan 02 18:54:36 rhel8.beta systemd[1]: kdump.service: Failed with result 'exit-code'.
Jan 02 18:54:36 rhel8.beta systemd[1]: Failed to start Crash recovery kernel arming.