On Mon, Dec 18, 2023, bugzilla-daemon@xxxxxxxxxx wrote: > > I think the kernel is preemptible: > > Ya, not fully preemptible (voluntary only), but the important part is that KVM > will drop mmu_lock if there is contention (which is a "requirement" for the bug > that Yan encountered). For posterity, the above is wrong. Volutary preemption isn't _supposed_ to enable yielding of contended spinlocks/rwlocks, but due to a bug with dynamic preemption, the behavior got enabled for all preempt models: https://lore.kernel.org/all/20240110214723.695930-1-seanjc@xxxxxxxxxx
