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Re: [Qemu-devel] [Qemu-stable] Broken live Migration in Qemu

From: Stefan Priebe - Profihost AG
Subject: Re: [Qemu-devel] [Qemu-stable] Broken live Migration in Qemu
Date: Mon, 6 Jun 2016 18:13:48 +0200

We're most probably seeing the same while migrating a machine running balanceng 
but haven't thought this might be a qemu bug. Instead we're investigating with 
balanceng people.

Waiting for your further results.


Excuse my typo sent from my mobile phone.

> Am 06.06.2016 um 17:51 schrieb Peter Lieven <address@hidden>:
>> Am 06.06.2016 um 15:32 schrieb Peter Lieven:
>> Hi,
>> during internal testing of Qemu 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

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