Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration

[Marcelo Tosatti]

On Fri, Aug 22, 2014 at 04:05:46PM -0300, Marcelo Tosatti wrote:
> On Fri, Aug 22, 2014 at 04:05:07PM -0300, Marcelo Tosatti wrote:
> > On Fri, Aug 22, 2014 at 10:39:38PM +0400, Andrey Korolyov wrote:
> > > On Fri, Aug 22, 2014 at 9:45 PM, Marcelo Tosatti <address@hidden> wrote:
> > > > On Fri, Aug 22, 2014 at 08:44:53PM +0400, Andrey Korolyov wrote:
> > > >> >
> > > >> > I`m running 3.10, so patches are not here, will try 3.16 soon. Even 
> > > >> > if
> > > >> > problem will be fixed, it still will be specific for 2.1, earlier
> > > >> > releases working well and I`ll bisect at a time.
> > > >>
> > > >> Thanks, using 3.16 helped indeed. Though the bug remains as is at 2.1
> > > >> on LTS 3.10, should I find the breaking commit, or it is better to
> > > >> backport kvm subsystem changes related to apic to 3.10?
> > > >
> > > > Andrey,
> > > >
> > > > Can you try the patchset (which includes cpu_clean_all_dirty) please?
> > > > It should be equivalent to your proposed patch.
> > > >
> > > >
> > > 
> > > 
> > > Just checked case for Windows, bug is still here (twelve continuous
> > > ping-pong migrations between two hosts). Also there is very weird
> > > observation that the if VM stalled, password window renders in a
> > > cripple way just after connection when no VNC region refreshes are
> > > made yet by mouse, vm-is-alive case rendering after-c-a-d prompt
> > > properly. Probably it`ll be easier to check behaviour against Paolo`
> > > patchset for RH kernel, though I`m still in progress with cutting out
> > > the rest to adapt them on top of bare 3.10, for ones with access to
> > > git log it should be easier :)
> > 
> > Argh i forgot cpu_sync_all_states. Will resend shortly.
> 
> Well, can you add cpu_synchronize_all_states() before 
> the cpu_clean_all_dirty() call and retry?
> 
> Sorry.

Andrey,

Can you give instructions on how to reproduce please?

- qemu.git codebase (if you have any patches relative to a
given commit id, please provide the patches).
- qemu command line.
- how to recreate guest disk contents.
- how to recreate workload at which point migration 
fails.
- migration command relative to last item.


Thanks