kexec -s causes system panic on kernel-rt on UEFI machine

Issue

• Kernel crashes with efi=noruntime to disable efi.
• Kernel panics with the following messages:

[  103.794324] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 
[  103.794326] PGD 0 P4D 0  
[  103.794329] Oops: 0000 [#1] PREEMPT_RT SMP PTI 
[  103.794331] CPU: 4 PID: 13901 Comm: kexec Tainted: G          I      --------- -  - 4.18.0-226.rt7.38.el8.x86_64 #1 
[  103.794332] Hardware name: Dell Inc. PowerEdge R640/0RGP26, BIOS 2.2.11 06/13/2019 
[  103.794338] RIP: 0010:memcpy_erms+0x6/0x10 
[--]
[  103.794348] Call Trace: 
[  103.794354]  efi_runtime_map_copy+0x28/0x30 
[  103.794359]  bzImage64_load+0x644/0x8bc 
[  103.794364]  arch_kexec_kernel_image_load+0x6d/0x70 
[  103.794369]  kimage_file_alloc_init+0x1d9/0x2b0 
[  103.794371]  __x64_sys_kexec_file_load+0x18d/0x290 
[  103.794375]  do_syscall_64+0x87/0x1a0 
[  103.794379]  entry_SYSCALL_64_after_hwframe+0x65/0xca 
[  103.794381] RIP: 0033:0x7f4aa2b7178d 
[--]
[  103.794413] CR2: 0000000000000000 
[  104.091821] ---[ end trace 0000000000000002 ]--- 
[  104.099653] RIP: 0010:memcpy_erms+0x6/0x10