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From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Sergey Kovalev <valor@list.ru>
Cc: <xen-devel@lists.xen.org>, <zaytsevgu@gmail.com>
Subject: Re: Fwd: [BUG] Windows is frozen after restore from snapshot
Date: Fri, 23 Apr 2021 17:08:45 +0200	[thread overview]
Message-ID: <YILi/Qft51Vh5QZy@Air-de-Roger> (raw)
In-Reply-To: <46f8bf3e-cd6e-e2de-94c1-c8a55fb10648@list.ru>

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@gmail.com 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.


  parent reply	other threads:[~2021-04-23 15:09 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <6237e102-f2cf-a66e-09b6-954ebfe28f8c@list.ru>
2021-04-23 10:22 ` Sergey Kovalev
2021-04-23 12:30   ` Jan Beulich
2021-04-23 12:55     ` Sergey Kovalev
2021-04-23 13:10       ` Георгий Зайцев
2021-04-23 13:21         ` Jan Beulich
2021-04-23 13:30           ` Георгий Зайцев
2021-04-23 13:40             ` Jan Beulich
2021-04-23 15:08   ` Roger Pau Monné [this message]
2021-04-23 16:19     ` Sergey Kovalev
2021-04-24  0:39       ` Tamas K Lengyel

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