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Re: Fwd: [BUG] Windows is frozen after restore from snapshot
- To: Sergey Kovalev <valor@xxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 23 Apr 2021 17:08:45 +0200
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- Cc: <xen-devel@xxxxxxxxxxxxx>, <zaytsevgu@xxxxxxxxx>
- Delivery-date: Fri, 23 Apr 2021 15:08:57 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
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