Bug 607533 – Vhost:Fail to transfer file between two guests in same vlan

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Bug 607533 - Vhost:Fail to transfer file between two guests in same vlan

Summary:	Vhost:Fail to transfer file between two guests in same vlan

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 4
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	4.8
Hardware:	All Linux

Priority	medium Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Michael S. Tsirkin
QA Contact:	Virtualization Bugs
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:	607177
Blocks:	580954
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Reported:	2010-06-24 06:14 EDT by Michael S. Tsirkin
Modified:	2011-02-16 11:02 EST (History)
CC List:	4 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:	607177
Environment:
Last Closed:	2011-02-16 11:02:20 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0263	normal	SHIPPED_LIVE	Important: Red Hat Enterprise Linux 4.9 kernel security and bug fix update	2011-02-16 10:14:55 EST

Groups: None (edit)

Comment 1 Michael S. Tsirkin 2010-06-24 06:15:48 EDT

This is a bug in virtio-net driver.
This is fixed upstream e918085aaff34086e265f825dd469926b1aec4a4:

    virtio_net: Fix MAX_PACKET_LEN to support 802.1Q VLANs
    
    802.1Q expanded the maximum ethernet frame size by 4 bytes for the
    VLAN tag.  We're not taking this into account in virtio_net, which
    means the buffers we provide to the backend in the virtqueue RX ring
    aren't big enough to hold a full MTU VLAN packet.  For QEMU/KVM,
    this results in the backend exiting with a packet truncation error.
    
    Signed-off-by: Alex Williamson <alex.williamson@hp.com>
    Acked-by: Mark McLoughlin <markmc@redhat.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Comment 3 Amos Kong 2010-06-24 07:43:32 EDT

Change the guest mtu to 1490 before testing, file transferred successfully.

I'll tested with this guest kernel.
https://brewweb.devel.redhat.com/taskinfo?taskID=2549179

Comment 4 Amos Kong 2010-06-24 08:07:24 EDT

(In reply to comment #3)
> Change the guest mtu to 1490 before testing, file transferred successfully.
> 
> I'll tested with this guest kernel.
> https://brewweb.devel.redhat.com/taskinfo?taskID=2549179    

After updated guest kernel, bug could not be reproduced.

Comment 7 RHEL Product and Program Management 2010-08-19 13:28:49 EDT

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 8 Vivek Goyal 2010-09-23 09:03:19 EDT

Committed in 89.37.EL . RPMS are available at http://people.redhat.com/vgoyal/rhel4/

Comment 11 Mike Gahagan 2011-01-06 13:49:12 EST

confirmed with the test case in comment #0. Host used was 6.0 (64-bit) both 4.9 guests were 32 bit.

Comment 13 errata-xmlrpc 2011-02-16 11:02:20 EST

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-2011-0263.html

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