default or selected kernelversion does not have config value CONFIG_KCSAN_DEBUG.
Result is shown for kernelversion 6.9.8

Debugging of KCSAN internals

configname: CONFIG_KCSAN_DEBUG

Linux Kernel Configuration
└─>Kernel hacking
└─>Generic Kernel Debugging Instruments
└─>KCSAN: dynamic data race detector
└─>Debugging of KCSAN internals
In linux kernel since version 5.1 (release Date: 2019-05-05)  
depends
CONFIG_KCSAN