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Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration |
Date: |
Wed, 22 Feb 2017 12:15:54 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 |
On 22/02/2017 04:08, Chris Friesen wrote:
> On 02/19/2017 10:38 PM, Han, Huaitong wrote:
>> Hi, Gaohuai
>>
>> I tried to debug the problem, and I found the indirect cause may be that
>> the rmap value is not cleared when KVM mmu page is freed. I have read
>> code without the root cause. Can you stable reproduce the the issue?
>> Many guesses need to be verified.
>
> In both cases it seems to have been triggered by repeatedly
> live-migrating a KVM virtual machine between two hypervisors with
> Broadwell CPUs running the latest CentOS 7.
>
> It's a race of some sort, it doesn't happen every time.
Can you reproduce it with kernel 4.8+? I'm suspecting commmit
4e59516a12a6 ("kvm: vmx: ensure VMCS is current while enabling PML",
2016-07-14) to be the fix.
Paolo
- [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Herongguang (Stephen), 2017/02/09
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Herongguang (Stephen), 2017/02/10
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Herongguang (Stephen), 2017/02/10
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Chris Friesen, 2017/02/10
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Paolo Bonzini, 2017/02/10
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, hangaohuai, 2017/02/13
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, hangaohuai, 2017/02/19
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Han, Huaitong, 2017/02/19
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Chris Friesen, 2017/02/21
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration,
Paolo Bonzini <=
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Chris Friesen, 2017/02/22
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Paolo Bonzini, 2017/02/22
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Herongguang (Stephen), 2017/02/23
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Herongguang (Stephen), 2017/02/24
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Greg KH, 2017/02/24
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Paolo Bonzini, 2017/02/24
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Greg KH, 2017/02/24
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Chris Friesen, 2017/02/24
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Paolo Bonzini, 2017/02/24
- Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration, Herongguang (Stephen), 2017/02/24