Bug 1151830

Summary:	Race-condition w/ integrated SPICE/VNC console which leads to SPICE/VNC display freeze
Product:	[Community] Virtualization Tools	Reporter:	Matthias Dahl <ua_bugzilla_redhat>
Component:	virt-manager	Assignee:	Cole Robinson <crobinso>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	berrange, crobinso, gscrivan, rbalakri
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-10-14 14:59:12 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Matthias Dahl 2014-10-12 12:33:33 UTC

Description of problem:
My test scenario is a simple KVM image created through virt-manager w/ Spice, QXL 64 MiB, 2 GiB RAM, 4 Cores and no disks at all -- just a plain old LiveCD attached to the CDROM.

Starting this (or any other) VM through virt-manager so that it opens the UI-integrated SPICE/VNC console, leads to a malfunctioning SPICE/VNC console. There seems to be a race-condition: Sometimes you can only see the SeaBIOS text, sometimes even that only partially and sometimes it even gets to the LiveCD prompt itself but that is as far as it goes. Eventually the console is no longer updated.

Connecting to the VM through an external Spice or VNC client works just fine and the VM is up and running as well.

Version-Release number of selected component (if applicable):
virt-manager: 1.0.1, 1.1.0 and master.
libvirt: 1.2.6 and 1.2.9.
spice-gtk: 0.25 and master
qemu: 2.1.1
Kernel: 3.16.1

How reproducible:
always

Steps to Reproduce:
1. Create a VM for Qemu w/ only a LiveCD attached (no disks whatsoever)
2. Configure the VM for either VNC or SPICE
3. Start the VM through virt-manager

Actual results:
Console freezes at random points but always within a second or so.

Expected results:
Console just works.

Additional info:

Comment 1 Matthias Dahl 2014-10-14 14:59:12 UTC

After wading through the virt-manager sources and debugging this, I eventually came to realize that this seemingly is a cairo problem that surfaces if the xlib-xcb adapter is enabled.

For completeness, here a link to the relevant bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=85005

Sorry for the noise. :-(