Re: [Qemu-devel] Question about VM inner route entry's lost when vhost-user reconnect

[Stefan Hajnoczi]

On Tue, Mar 19, 2019 at 09:51:17AM +0000, Lilijun (Jerry, Cloud Networking) 
wrote:
> After more detail test, I found two results:
> 1) This route entry's lost  can be reproduced on both virtio-net and 
> pass-through physical devices.
> 2) The link down event is handled by a service named NetworkManager in my VM 
> (CentOS linux 3.10.0-514-e17.x86_64).  If I stop or kill this service,  the 
> issue got disappeared.
> 
> So, if some customer's VM guest OS works like my VM,  this problem will cause 
> some unexpected TCP connection disconnected when the backend process crashed.

Thanks for checking!

Based on these results I would say that QEMU/KVM is acting like physical
hardware (which is usually the right thing) and it would be a regression
to change this behavior at the QEMU/KVM level.

Stefan

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