Kdump fails to generate vmcore on Red Hat Enterprise Linux 7 with lvm snapshot.

Issue

• Kdump fails to generate vmcore and reports following messages in system console.

[  123.461072] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  124.013552] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  124.519134] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  125.024602] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  125.529987] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  126.035644] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  126.541033] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  127.046671] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
.
[  183.675954] dracut-initqueue[243]: Warning: dracut-initqueue timeout - starting timeout scripts
[  183.677589] dracut-initqueue[243]: Warning: Could not boot.
[  183.678933] dracut-initqueue[243]: Warning: /dev/mapper/rhel-root does not exist
[  183.680407] dracut-initqueue[243]: Warning: /dev/rhel/root does not exist
[  OK  ] Stopped target Basic System.
[  OK  ] Stopped target System Initialization.
         Starting Kdump Emergency...