2017-06-30 1:14 GMT+08:00 Paolo Bonzini <pbonzini@xxxxxxxxxx>: > > > 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? Sorry for the late response, it can't be reproduced in 4.10 Linus tree. Regards, Wanpeng Li > > 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 >>
