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

[Stefan Priebe - Profihost AG]

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.

Greets,
Stefan

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 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