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Bug 636020

Summary:	PATCH: virtio_console: Fix poll blocking even though there is data to read
Product:	Red Hat Enterprise Linux 5	Reporter:	Amit Shah <amit.shah>
Component:	kernel	Assignee:	Amit Shah <amit.shah>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	medium
Version:	5.6	CC:	amit.shah, hdegoede, llim, mjenner, tburke, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	634232	Environment:
Last Closed:	2011-01-13 21:20:52 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	634232
Bug Blocks:	580954

Comment 1 RHEL Program Management 2010-09-21 12:49:17 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 3 Hans de Goede 2010-10-09 08:12:25 UTC

Hi,

Some info on verifying this bug. As mentioned in the patch commit message I hit this problem while working on a spice agent for linux:
http://cgit.freedesktop.org/~jwrdegoede/vdagent-linux/

To reproduce to the following:
create a rhel kvm guest using the qxl adapter / spice protocol for display. and not using the usbtablet option for mouse.

Inside this guest, compile the agent, then start vdagentd (as root) followed by vdagent

Notice that you can now move your mouse outside of the spice-client window,
even though it is active (iow grabbed) inside it.

Now press the right mouse button on the desktop background and keep it pressed, this will give you a selection rectangle.

Move the mouse slowly around a bit keeping the button pressed, notice that
the corner of the selectionrectangle exactly matches the hotspot of the mouse corner.

Now move the mouse around fast. After a while you will see the actual mouse
position and the corner of the selection rectangle no longer match. This is caused by the bug this patch fixes.

###

Alternatively, I can verify the fix myself. Once a fixed kernel is available it is easy for me to install it inside my guest and verify this problem is not happening, exp. as I exactly now the problem symptoms.

Regards,

Hans

Comment 6 Jarod Wilson 2010-10-14 14:03:42 UTC

in kernel-2.6.18-227.el5
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5

Detailed testing feedback is always welcomed.

Comment 9 errata-xmlrpc 2011-01-13 21:20:52 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0017.html