netdev - Re: [libvirt-users] libvirt & virtio_net

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Date:	Fri, 05 Jul 2013 13:08:43 +0200
From:	poma <pomidorabelisima@...il.com>
To:	"Daniel P. Berrange" <berrange@...hat.com>
CC:	libvir-list@...hat.com, netdev@...r.kernel.org,
	libvirt-users@...hat.com,
	"qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
	kvm-devel <kvm@...r.kernel.org>,
	Mateusz Marzantowicz <mmarzantowicz@...f.com.pl>,
	Virt-tools List <virt-tools-list@...hat.com>,
	Josh Boyer <jwboyer@...hat.com>, Cong Wang <amwang@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: [libvirt-users] libvirt & virtio_net - host.freeze@...et.domain

On 04.07.2013 11:14, poma wrote:
> On 03.07.2013 13:43, Daniel P. Berrange wrote:
>> On Tue, Jul 02, 2013 at 01:25:21PM +0200, poma wrote:
>>> Hello people,
>>>
>>> libvirtd (libvirt) 1.0.5.2
>>> virsh 1.0.5.2
>>> virt-manager 0.10.0
>>>
>>> Host:
>>> Linux localhost 3.9.8-300.fc19.x86_64 #1 SMP Thu Jun 27 19:24:23 UTC
>>> 2013 x86_64 x86_64 x86_64 GNU/Linux
>>> Guest1:
>>> Linux localhost 3.9.8-300.fc19.i686.PAE #1 SMP Thu Jun 27 19:29:30 UTC
>>> 2013 i686 (none)
>>> Guest2:
>>> Linux localhost 3.9.8-300.fc19.x86_64 #1 SMP Thu Jun 27 19:24:23 UTC
>>> 2013 x86_64 x86_64 x86_64 GNU/Linux
>>>
>>>
>>> Virtual NIC - source & model:
>>> macvtap/NAT/bridge & virtio(virtio_net)
>>>
>>> Host freeze at "virsh reset <domain>" or "virt-manager - Force Reset"
>>> Need kernel.sysrq or power reset.
>>
>> I don't believe this is a libvirt issue - the 'virsh reset' command
>> will issue the 'system_reset' QEMU monitor command. This in turn
>> does an immediate reset of the guest CPUs/machine.
>>
>> Even if QEMU is doing the wrong thing, the kernel should obviously
>> never freeze/crash in this way - it should be robust against a
>> malicious QEMU process.
>>
>> You should probably send this message to the main QEMU and/or KVM
>> mailing lists so that it comes to the attention of people who are
>> more familiar with QEMU + virtio-net
>>
>>
>> Regards,
>> Daniel
>>
> 
> Thanks for your response.
> Mateusz hit the same issue[1] as well.
> OK, here we go.
> 
> 
> poma
> 
> 
> [1] https://lists.fedoraproject.org/pipermail/users/2013-July/436984.html

OK, is this a side effect or not, but certainly kernel[1] with
'bridge-timer-fix.patch'[2] resolves issue aforementioned, so far.
Thanks Cong, Josh.


poma


[1] http://koji.fedoraproject.org/koji/taskinfo?taskID=5569632
    kernel-3.9.8-300.7.fc19.x86_64.rpm
[2] https://bugzilla.redhat.com/show_bug.cgi?id=880035#c53

Ref.
    "fix for unreliable guest->host multicast triggers oops"
    https://bugzilla.redhat.com/show_bug.cgi?id=980254

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