So you want to torture RCU?
summary
rcutorture runs kernel-module tests that build kernels, create guest VMs and run 19 concurrent scenarios to stress RCU, using scripts like kvm.sh / kvm.again.sh and kvm remote to control CPUs (64/128), durations (30 min default, 45 s fast repro) and inject jitter, hotplug and callback pressure. the suite finds RCU heisenbugs and cross-module bugs (runs exposed up to one million callbacks queued), targeting ~18k LOC of RCU where stats predict ~18–55 bugs, and prints per-test grace‑period and stall diagnostics.
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