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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