On 29/06/2017 08:21, Wanpeng Li wrote: > 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. Can you reproduce it in 4.10? Thanks, Paolo > ------------[ 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 >
