kexec is failing with kernel panic

Issue

The kexec system call causes a booting process failure with an error similar to the following:

[    0.000000] Kernel panic - not syncing: ERROR: Failed to allocate 0x0000000000004000 bytes below 0x0000000020000000.
[    0.000000] 
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.18.0-128.el8.ppc64le #1
[    0.000000] Call Trace:
[    0.000000] [c00000000165fc70] [c000000000d1c06c] dump_stack+0xb0/0xf4 (unreliable)
[    0.000000] [c00000000165fcb0] [c0000000001432e4] panic+0x148/0x324
[    0.000000] [c00000000165fd50] [c0000000010e0484] memblock_alloc_base+0x44/0x58
[    0.000000] [c00000000165fdc0] [c0000000010aace8] alloc_stack+0x74/0xac
[    0.000000] [c00000000165fe30] [c0000000010ab650] emergency_stack_init+0xa8/0x18c
[    0.000000] [c00000000165fe90] [c0000000010aa8c4] setup_arch+0x38c/0x414
[    0.000000] [c00000000165ff00] [c0000000010a3c80] start_kernel+0x90/0x658

This problem usually happens on large configuration systems when the crashkernel parameter is passed to the kernel.