Opbzil

to fix stuff you need to get in to emergency mode. For this you will need the root password

To boot into emergency to you to interrupt the boot and edit the line in grub that begins with linux. append systemd.unit=emergency.target

for example

LINUX=crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/rhel-swap \
 rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet systemd.unit=emergency.target

remount system as rw

 mount =o remount,rw /sysroot 

change root to /sysroot

chroot /sysroot 

try seeing what is mounting or giving errors using the av options of mount