[dpdk-dev] Crashing OVS+DPDK at the host, from inside of a KVM Guest

[Traynor, Kevin]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Christian
> Ehrhardt
> Sent: Wednesday, May 25, 2016 7:06 AM
> To: Martinx - ジェームズ <thiagocmartinsc at gmail.com>
> Cc: <dev at openvswitch.org> <dev at openvswitch.org>; dev <dev at dpdk.org>
> Subject: Re: [dpdk-dev] Crashing OVS+DPDK at the host, from inside of
> a KVM Guest
> 
> Hi,
> ping ...
> 
> Later on I want to look at it again once we upgraded to more recent
> releases of the software components involved, but those have to be
> made
> ready to use first :-/
> 
> But the description is good and I wonder if anybody else could
> reproduce
> this and/or would have a hint on where this might come from or already
> existing related fixes.
> 
> I mean in general nothing should be able to crash the host right?

Hi, I don't know if they are related to the issue that is being seen,
but Yuanhan made some fixes in DPDK 16.04 regarding a malicious guest
affecting the host. rte_vhost_dequeue_burst() is showing in the stack
trace so it might worth testing with the latest code to see if it's the
same issue and has been fixed.

Kevin.

> 
> 
> P.S. yeah two list cross posting, but it is yet unclear which it
> belongs to
> so I'll keep it
> 
> Christian Ehrhardt
> Software Engineer, Ubuntu Server
> Canonical Ltd
> 
> On Sun, May 15, 2016 at 7:08 AM, Martinx - ジェームズ
> <thiagocmartinsc at gmail.com>
> wrote:
> 
> > Guys,
> >
> >  If using OVS 2.5 with DPDK 2.2, on Ubuntu Xenial, it is possible to
> crash
> > the OVS running at the host, from inside of a KVM Guest.
> >
> >  Basically, what I'm trying to do, is to run OVS+DPDK at the host,
> and
> > also, inside of a KVM Guest, with multi-queue, but it doesn't work
> and
> > crashes.
> >
> >  Soon as you enable multi-queue at the guest, it crashes the OVS of
> the
> > host!
> >
> > OVS+DPDK segfault at the host, after running "ovs-vsctl set
> Open_vSwitch .
> > other_config:n-dpdk-rxqs=4" within a KVM Guest:
> >
> > https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/1577088
> >
> > Thanks!
> > Thiago
> >