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From: Sergey Kovalev <valor@list.ru>
To: "Roger Pau Monné" <roger.pau@citrix.com>
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 19:19:16 +0300	[thread overview]
Message-ID: <e8770b62-753a-beed-66b2-e8c99db9a57e@list.ru> (raw)
In-Reply-To: <YILi/Qft51Vh5QZy@Air-de-Roger>


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@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.
> 

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



  reply	other threads:[~2021-04-23 16:19 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
2021-04-23 16:19     ` Sergey Kovalev [this message]
2021-04-24  0:39       ` Tamas K Lengyel

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