CONFIG_DEBUG_KERNEL_WITH_GDB_STUB is not available for thedefaultarchitecture x86.
Result is shown for architecture sh64
default or selected kernelversion does not have config value CONFIG_DEBUG_KERNEL_WITH_GDB_STUB.
Result is shown for kernelversion 5.4.123

GDB Stub kernel debug

configname: CONFIG_DEBUG_KERNEL_WITH_GDB_STUB

Linux Kernel Configuration
└─>Kernel hacking
└─>GDB Stub kernel debug
In linux kernel since version 2.6.12