Red Hat Enterprise Linux 7.6 freezes when rebooting

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I have a machine installed with Red Hat Enterprise Linux 7.6 (Maipo) that freezes every time I try to reboot it (using "shutdown -r now" of using the graphical interface). The display freezes with a message saying "Rebooting" and thats all.

I already tried the solutions proposed here:

https://access.redhat.com/solutions/198483

but inothing changed.

This is my current output of the "cat /proc/cmdline" command:

BOOT_IMAGE=/vmlinuz-3.10.0-957.1.3.el7.x86_64 root=/dev/mapper/rhel-root ro crashkernel=auto rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet

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