Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation

[Marcelo Tosatti]

On Tue, Jul 15, 2014 at 05:31:22PM -0300, Marcelo Tosatti wrote:
> On Tue, Jul 15, 2014 at 10:15:14PM +0200, Paolo Bonzini wrote:
> > Il 15/07/2014 22:03, Marcin Gibuła ha scritto:
> > >>This causes a hang during migration, so I'll revert the patch from 2.1.
> > >
> > >For me this patch series fixed all hangs I had with migration (at least
> > >with qemu 2.0).
> > 
> > Unfortunately, someone else bisected their hangs exactly to this patch:
> > 
> > http://permalink.gmane.org/gmane.comp.emulators.qemu/286681
> > 
> > I could not reproduce that, but I couldn't reproduce yours either so
> > I'm inclined to trust him and revert the patch.
> 
> This patch (or some form of updating env->tsc, see changelog) 
> is necessary.
> 
> I was just about to reproduce it.
> 
> Andrey, can you please provide the qemu command line ?
> 
> Can you attempt to start VM via command line and migrate
> via QEMU monitor, then gdb -p to get a backtrace for all 
> threads ?
> 

The backtrace in the following message is for a different problem,
correct?

http://www.mail-archive.com/address@hidden/msg246161.html