* KVM: BUG during OOM on host
@ 2017-06-29 6:21 Wanpeng Li
2017-06-29 17:14 ` Paolo Bonzini
0 siblings, 1 reply; 3+ messages in thread
From: Wanpeng Li @ 2017-06-29 6:21 UTC (permalink / raw)
To: kvm, linux-kernel, Paolo Bonzini, Radim Krcmar; +Cc: Wanpeng Li
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KVM: BUG during OOM on host
2017-06-29 6:21 KVM: BUG during OOM on host Wanpeng Li
@ 2017-06-29 17:14 ` Paolo Bonzini
2017-07-25 23:14 ` Wanpeng Li
0 siblings, 1 reply; 3+ messages in thread
From: Paolo Bonzini @ 2017-06-29 17:14 UTC (permalink / raw)
To: Wanpeng Li, kvm, linux-kernel, Radim Krcmar; +Cc: Wanpeng Li
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
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KVM: BUG during OOM on host
2017-06-29 17:14 ` Paolo Bonzini
@ 2017-07-25 23:14 ` Wanpeng Li
0 siblings, 0 replies; 3+ messages in thread
From: Wanpeng Li @ 2017-07-25 23:14 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: kvm, linux-kernel, Radim Krcmar, Wanpeng Li
2017-06-30 1:14 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>:
>
>
> 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
>>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-07-25 23:14 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2017-06-29 6:21 KVM: BUG during OOM on host Wanpeng Li
2017-06-29 17:14 ` Paolo Bonzini
2017-07-25 23:14 ` Wanpeng Li
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