default or selected kernelversion does not have config value CONFIG_KCOV_SELFTEST.
Result is shown for kernelversion 6.12-rc2

Perform short selftests on boot

configname: CONFIG_KCOV_SELFTEST

Linux Kernel Configuration
└─>Kernel hacking
└─>Kernel Testing and Coverage
└─>Perform short selftests on boot
In linux kernel since version 6.1.112 (release Date: 2024-09-30)  
Run short KCOV coverage collection selftests on boot.
On test failure, causes the kernel to panic. Recommended to be
enabled, ensuring critical functionality works as intended.

depends
CONFIG_KCOV