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SubjectRe: VMs freezing when host is running 4.14
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On 14/02/2018 03:04, Josh Poimboeuf wrote:
> On Sun, Feb 11, 2018 at 02:39:41PM +0100, Marc Haber wrote:
>> Hi,
>>
>> after in total nine weeks of bisecting, broken filesystems, service
>> outages (thankfully on unportant systems), 4.15 seems to have fixed the
>> issue. After going to 4.15, the crashes never happened again.
>>
>> They have, however, happened with each and every 4.14 release I tried,
>> which I stopped doing with 4.14.15 on Jan 28.
>>
>> This means, for me, that the issue is fixed and that I have just wasted
>> nine weeks of time.
>>
>> For you, this means that you have a crippling, data-eating issue in the
>> current long-term releae kernel. I do sincerely hope that I never have
>> to lay my eye on any 4.14 kernel and hope that no major distribution
>> will release with this version.
>
> I saw something similar today, also in kvm_async_pf_task_wait(). I had
> -tip in the guest (based on 4.16.0-rc1) and Fedora
> 4.14.16-300.fc27.x86_64 on the host.

Hi Josh/Marc,

this is fixed by

commit 2a266f23550be997d783f27e704b9b40c4010292
Author: Haozhong Zhang <haozhong.zhang@intel.com>
Date: Wed Jan 10 21:44:42 2018 +0800

KVM MMU: check pending exception before injecting APF

For example, when two APF's for page ready happen after one exit and
the first one becomes pending, the second one will result in #DF.
Instead, just handle the second page fault synchronously.

Reported-by: Ross Zwisler <zwisler@gmail.com>
Message-ID: <CAOxpaSUBf8QoOZQ1p4KfUp0jq76OKfGY4Uxs-Gg8ngReD99xww@mail.gmail.com>
Reported-by: Alec Blayne <ab@tevsa.net>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

and it will be in 4.14.20. Unfortunately I only heard about this issue
last week.

Thanks,

Paolo

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