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[Qemu-devel] [Bug 1180777] Re: RDP traffic freeze on quiet network

From: Hector Perez
Subject: [Qemu-devel] [Bug 1180777] Re: RDP traffic freeze on quiet network
Date: Tue, 24 Sep 2013 00:51:33 -0000

Since a couple of weeks ago, we started to reboot the VM diary.  With
this way, the problem occurs very less. We have counted only twice in
this period.

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  RDP traffic freeze on quiet network

Status in QEMU:
Status in “qemu-kvm” package in Ubuntu:
Status in Debian GNU/Linux:

Bug description:
  To summarize what I think has been found so far,

    1. The main symptom is that RDP connections hang after some time
    2. This bug affects qemu 1.0 .. 1.6.5
    3. This bug affects at least windows xp and windows 7 guests
    4. Keeping another network connection open, such as vnc, prevents the RDP 
connection from hanging.


  I have recently setup a Windows 7 VM on KVM and started using it
  through remote desktop.

  What happens is that, after some hours of usage, the remote desktop
  connection freezes. I thought it was a remmina bug, as the it was
  enough to kill and restart it to successfully connect again to the VM.

  However, today I've switched to a different RDP client (2X Client
  chromium app) and the freeze just happened again!

  Some information:
  - the host and the VM are completely idle when the freeze occurs
  - I've tried sniffing the network packets toward the RDP port during the 
freeze and found that the client is sending packets but no packet is sent back

  Could this be a KVM issue? How can I further debug this one (I expect
  the freeze to happen again...)?

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: kvm 1:84+dfsg-0ubuntu16+1.0+noroms+0ubuntu14.8
  ProcVersionSignature: Ubuntu 3.2.0-41.66-generic 3.2.42
  Uname: Linux 3.2.0-41-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: amd64
  Date: Thu May 16 14:12:40 2013
  MachineType: Hewlett-Packard HP ProBook 4520s
  MarkForUpload: True
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic 
root=UUID=D2E20BC3E20BAAB5 loop=/hostname/disks/root.disk ro quiet splash 
  SourcePackage: qemu-kvm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/26/2010
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68AZZ Ver. F.0A
  dmi.board.name: 1411
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 57.30
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.product.name: HP ProBook 4520s
  dmi.sys.vendor: Hewlett-Packard

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