switch redhat linux 8.4 for realtime kernel error.

try to optimize low-latency for hft.

and install realtime kernel from

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/8/html-single/installing_rhel_8_for_real_time/index#proc_installing-red-hat-enterprise-linux-for-real-time-using-yum_assembly_installing-rhel-for-real-time

execute command

subscription-manager repos --enable rhel-8-for-x86_64-rt-rpms
yum groupinstall RT

and swtich kernel by
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/8/html-single/optimizing_rhel_8_for_real_time_for_low_latency_operation/index#real-time-kernel-tuning-in-rhel-8_optimizing-RHEL8-for-real-time-for-low-latency-operation

but when i restart the system and choose rt to start, got the error in the picture

when i restart system again and got kernel panic not syncing