linux-kernel - Re: vhost changes (batched) in linux-next after 12/13 trigger random crashes in KVM guests after reboot

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Date:   Tue, 11 Feb 2020 11:07:54 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Eugenio Pérez <eperezma@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>
Subject: Re: vhost changes (batched) in linux-next after 12/13 trigger random
 crashes in KVM guests after reboot



On 11.02.20 10:56, Christian Borntraeger wrote:
> 
> 
> On 11.02.20 10:33, Eugenio Pérez wrote:
>> On Mon, 2020-02-10 at 12:01 +0100, Christian Borntraeger wrote:
>>>
>>> On 10.02.20 10:47, Eugenio Perez Martin wrote:
>>>> Hi Christian.
>>>>
>>>> I'm not able to reproduce the failure with eccb852f1fe6bede630e2e4f1a121a81e34354ab commit. Could you add more data?
>>>> Your configuration (libvirt or qemu line), and host's dmesg output if any?
>>>>
>>>> Thanks!
>>>
>>> If it was not obvious, this is on s390x, a big endian system.
>>>
>>
>> Hi Christian. Thank you very much for the hints.
>>
>> Could we add some debug traces? Something like the inline patch should give us some clues.
> 
> attached. this time the guest crashed (and no guest moved message)
> 

And here with Guest moved vq after some reboots.

View attachment "log2" of type "text/plain" (72381 bytes)