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Bug 1194042

Summary:	kernel 3.20 virtio networking is broken on kvm
Product:	[Fedora] Fedora	Reporter:	Orion Poplawski <orion>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	22	CC:	gansalmon, itamar, jonathan, kernel-maint, kevin, madhu.chinakonda, mchehab
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-3.20.0-0.rc0.git9.1.fc22	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-02-19 16:13:41 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:
Bug Depends On:
Bug Blocks:	1043123

Description Orion Poplawski 2015-02-18 20:29:29 UTC

Description of problem:

Updating to 3.20 kernels on my virtio kvm guests breaks networking in strange ways.  System can get DHCP address fine and tshark shows some traffic, but almost everything else (DNS, ping, ssh) fails.

Version-Release number of selected component (if applicable):
3.20.0-0.rc0.git4.1.fc23
3.20.0-0.rc0.git7.3.fc23

How reproducible:
two kvm guests so far

Comment 1 Kevin Fenzi 2015-02-19 02:14:14 UTC

Perhaps someone could run dmesg on both 3.20 and 3.19 and diff the two for changes?

Comment 2 Jens Petersen 2015-02-19 02:19:36 UTC

Reproduced: with kernel-3.20 I cannot ping any hosts, unlike with 3.19.

ie kernel-3.19.0-0.rc7.git3.1.fc22 works fine but not
kernel-3.20.0-0.rc0.git*.fc22 apparently.

I really think this should be a no-brainer Alpha blocker
but I can't remember if kvm counts.

Comment 3 Jens Petersen 2015-02-19 02:21:20 UTC

(Maybe this is also the reason I can't get net working in F22 boot.iso
or in fresh F22 install under kvm.)

Comment 4 Jens Petersen 2015-02-19 02:28:07 UTC

The dmesg diff doesn't seem to contain anything useful.
Maybe journalctl output diff would be better?

Comment 5 Jens Petersen 2015-02-19 03:46:47 UTC

Eric Paris pointed out on #fedora-devel that kernel-3.20.0-0.rc0.git9.1.fc22
seems to fix this.

and git9.1 is working okay for me.

Comment 6 Orion Poplawski 2015-02-19 16:13:41 UTC

Confirmed fixed for me.