Re: Fwd: [BUG] Windows is frozen after restore from snapshot

[Sergey Kovalev <valor@xxxxxxx>]

23.04.2021 18:08, Roger Pau Monné пишет:
> On Fri, Apr 23, 2021 at 01:22:34PM +0300, Sergey Kovalev wrote:
> > # Abstract
> >
> > After `xl save win win.mem` and then `xl restore win.hvm win.mem`
> > the Windows 10 VM remain frozen for about a minute. After the
> > minute it becomes responsive.
> >
> > During the freeze the OS remains semi-responsive: on `Ctrl+Shift+Esc`
> > press the wait cursor appears (blue circle indicator).
> >
> > This is an intermittent fault been reproduced only twice.
> >
> > # Technical notes
> >
> > It have been noticed that there were no timer interrupts during
> > the freeze.
> >
> > zaytsevgu@xxxxxxxxx has debugged the received Xen state file and
> > noticed that the flag HPET_TN_PERIODIC been set after unfreeze.
> >
> > Based on that he provided two Python scripts: one to check the
> > value and one to patch it.
> >
> > Both "broken" state files we have been detected and patched
> > successfully.
> >
> > # Other information
> >
> > ## Target machine
> >
> > ```bash
> > $ uname -a
> > Linux localhost 5.4.0-66-generic #74~18.04.2-Ubuntu SMP
> > Fri Feb 5 11:17:31 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
> > ```
> >
> > ## Xen version
> >
> > Build from source on tag RELEASE-4.12.4
> >
> > ## OS version
> >
> > * Windows 10 build 1803 x64
> Do you also run other versions of Windows, and in which case I assume
> you have never seen the issue on those, or it's this specific version
> the only that you use?
>
> Thanks, Roger.
We use Windows 7 SP1 x86/x64, Windows 8.1 update1 and
Windows 10 1803 x64.

The Windows 10 is the only one affected by the bug at
the time.
--
With best regards,
Sergey Kovalev