[Bug 1873032] [NEW] After upgrade qemu to 5.0.0-0.3.rc2.fc33 the virtual machine with Windows 10 after a while starts to work very slowly

[Mikhail Gavrilov]

Public bug reported:

Description of problem:

After upgrade qemu to 5.0.0-0.3.rc2.fc33 the virtual machine with
Windows 10 after a while starts to work very slowly

I created the virtual machine with Windows 10 with the following config:
- 1 CPU
- 2GB RAM
- With network access

I launch there a web browser there with flash content. 
And usually, the system (Windows 10) does not work there for more than an hour.
When the system starts to work very slowly it doesn't respond to "Reboot" and 
"Shut Down" commands. Only works "Force Reset" and "Force Off". But when I 
reboot the system with "Force Reset" it usually stuck at boot at the Windows 
splash screen. https://imgur.com/yGyacDG

The last version of qemu which not contain this issue is
5.0.0-0.2.rc0.fc33

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "win10.log"
   https://bugs.launchpad.net/bugs/1873032/+attachment/5354690/+files/win10.log

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https://bugs.launchpad.net/bugs/1873032

Title:
  After upgrade qemu to 5.0.0-0.3.rc2.fc33 the virtual machine with
  Windows 10 after a while starts to work very slowly

Status in QEMU:
  New

Bug description:
  Description of problem:

  After upgrade qemu to 5.0.0-0.3.rc2.fc33 the virtual machine with
  Windows 10 after a while starts to work very slowly

  I created the virtual machine with Windows 10 with the following config:
  - 1 CPU
  - 2GB RAM
  - With network access

  I launch there a web browser there with flash content. 
  And usually, the system (Windows 10) does not work there for more than an 
hour.
  When the system starts to work very slowly it doesn't respond to "Reboot" and 
"Shut Down" commands. Only works "Force Reset" and "Force Off". But when I 
reboot the system with "Force Reset" it usually stuck at boot at the Windows 
splash screen. https://imgur.com/yGyacDG

  The last version of qemu which not contain this issue is
  5.0.0-0.2.rc0.fc33

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