default or selected kernelversion does not have config value CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT.
Result is shown for kernelversion 6.4.14

Slow down RCU grace-period pre-initialization to expose races


Linux Kernel Configuration
└─>RCU Debugging
└─>Slow down RCU grace-period pre-initialization to expose races
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This option delays grace-period pre-initialization (the
propagation of CPU-hotplug changes up the rcu_node combining
tree) for a few jiffies between initializing each pair of
consecutive rcu_node structures. This helps to expose races
involving grace-period pre-initialization, in other words, it
makes your kernel less stable. It can also greatly increase
grace-period latency, especially on systems with large numbers
of CPUs. This is useful when torture-testing RCU, but in
almost no other circumstance.

Say Y here if you want your system to crash and hang more often.
Say N if you want a sane system.