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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.


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