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The Linux kernel configuration item CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT
:
CONFIG_RCU_TORTURE_TEST
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.
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