Re: [Qemu-devel] Broken live Migration in Qemu 2.5.1.1?

[Peter Lieven]

Am 06.06.2016 um 15:32 schrieb Peter Lieven:
> Hi,
>
> during internal testing of Qemu 2.5.1.1 I found a vServer running Ubuntu 12.04 
> (kernel 3.13) and a slave SQL server to
> stop replicating from the master. This seems to be reproducible. It is possible 
> to continue replication when issuing a slave stop / slave start.
> There is no error visible on the vServer.
>
> Has anyone a fix in mind that could be related to such an issue?
>
> Host kernel in Linux 4.4, Guest kernel 3.13. Guest driver is virtio-blk via 
> iSCSI. Emulated vCPU is Westmere.

After a lot of testing I found out that obviously thats no block driver 
problem, but a regression in the virtio-net or the network stack.

qemu_announce_self() is generating packets for all NICs, but it seems they are 
no longer emitted. This worked at least in qemu-2.2.0 with
the same guest kernel and host kernel.

I will continue debugging tomorrow why this happens.

Peter