Re: Live migration not possible from 5.0 to 5.1?

[Daniel P . Berrangé]

On Fri, Oct 30, 2020 at 12:02:18PM +0800, Antti Antinoja wrote:
> Hi All,
> 
> I couldn't find any mention about live migration incompatibility between 5.0 
> and 5.1 in the release notes but at least on our AMD based platform live 
> migration from 5.0 to 5.1 is not possible.
> 
> The upgraded host had identical versions with it's pair before the upgrade 
> was started:
> * qemu 5.0.0-r2
> * kernel 5.7.17
> 
> After upgrade:
> * qemu 5.1.0-r1
> * kernel 5.8.16
> 
> After reverting qemu back to 5.0.0-r2 migration worked normally.
> 
> On the sending end "info migrate" shows:
> (qemu) info migrate
> info migrate
> globals:
> store-global-state: on
> only-migratable: off
> send-configuration: on
> send-section-footer: on
> decompress-error-check: on
> clear-bitmap-shift: 18
> Migration status: failed (Unable to write to socket: Broken pipe)
> total time: 0 milliseconds
> 
> At least once the receiving end died (while running 5.1.0-r1). All attempts 
> resulted a "Broken pipe" error on the sending (5.0.0-r2) end.

You'll need to provide more information, most importantly how are you
launching QEMU - if manually, what CLI args are you giving it.

Regards,
Daniel
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