Hi all, When the OOM-Killer kills the guest which is running memory hog processes, there is tons of splatting as below: the page count reaches 0 before drop_spte. The splatting will disappear when disables THP on host. ------------[ cut here ]------------ WARNING: CPU: 4 PID: 28317 at arch/x86/kvm/mmu.c:682 mmu_spte_clear_track_bits+0x84/0x120 [kvm] CPU: 4 PID: 28317 Comm: kworker/4:2 Tainted: G B D W 4.12.0-rc7+ #29 Workqueue: events mmput_async_fn task: ffff9465283c3280 task.stack: ffffacb0083b4000 RIP: 0010:mmu_spte_clear_track_bits+0x84/0x120 [kvm] Call Trace: drop_spte+0x1a/0xb0 [kvm] mmu_page_zap_pte+0xcc/0xe0 [kvm] kvm_mmu_prepare_zap_page+0x81/0x4c0 [kvm] ? _raw_spin_lock+0x65/0x70 kvm_mmu_invalidate_zap_all_pages+0x171/0x240 [kvm] kvm_arch_flush_shadow_all+0xe/0x10 [kvm] kvm_mmu_notifier_release+0x54/0x90 [kvm] ? kvm_mmu_notifier_release+0x5/0x90 [kvm] __mmu_notifier_release+0x65/0x100 exit_mmap+0x168/0x180 ? __khugepaged_exit+0xdb/0x140 ? rcu_read_lock_sched_held+0x79/0x80 ? kmem_cache_free+0x2f2/0x350 mmput_async_fn+0x4c/0x140 process_one_work+0x203/0x690 worker_thread+0x4e/0x3b0 kthread+0x117/0x150 Regards, Wanpeng Li
