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

[Serge Hallyn]

** Summary changed:

- Windows 7 VM freeze on Ubuntu 12.04 KVM
+ RDP traffic freeze on quiet network

** Description changed:

+ 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.
+ 
+ ========================================
  Hi,
  
  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
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic root=UUID=D2E20BC3E20BAAB5 loop=/hostname/disks/root.disk ro quiet splash vt.handoff=7
  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.modalias: dmi:bvnHewlett-Packard:bvr68AZZVer.F.0A:bd08/26/2010:svnHewlett-Packard:pnHPProBook4520s:pvr:rvnHewlett-Packard:rn1411:rvrKBCVersion57.30:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 4520s
  dmi.sys.vendor: Hewlett-Packard

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https://bugs.launchpad.net/bugs/1180777

Title:
  RDP traffic freeze on quiet network

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