RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 873226 - attaching a dummy interface to bonding device causes a crash
Summary: attaching a dummy interface to bonding device causes a crash
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.3
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Cong Wang
QA Contact: Liang Zheng
URL:
Whiteboard:
: 874578 989505 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-11-05 11:43 UTC by sorin
Modified: 2018-12-04 14:50 UTC (History)
10 users (show)

Fixed In Version: kernel-2.6.32-355.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-02-21 06:55:20 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 723103 0 None None None Never
Red Hat Product Errata RHSA-2013:0496 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 21:40:54 UTC

Description sorin 2012-11-05 11:43:19 UTC 
Description of problem:

enslaving a dummy interface to a bonding interface will cause a crash. This does not happen in older kernel versions (see bellow)

Version-Release number of selected component (if applicable):
rhel6.3, kernel 2.6.32-279.11.1.el6.x86_64, 
NOT 2.6.32-220.el6.x86_64

How reproducible:


Steps to Reproduce:

0.latest kernel in rhel6 (see above)

1.modprobe bonding
2.modprobe dummy
3.ifconfig bond0 up
4.ifenslave bond0 dummy0

<panic>

this is reproducible on a virtual machine without a problem


  
Actual results:

kernel panic

Expected results:

dummy0 is enslaved to bond0, no other effect.

Additional info:

Not including stack trace or vmcore, as it is so easy and reliable to reproduce. If something else needed, please ask.
Comment 3 Cong Wang 2012-11-09 05:16:50 UTC 
A guess:

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3b75d62..34a9db5 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1750,7 +1750,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
        /*
         * Sync the slaves vlan state with the bonds vlan state
         */
-       if (slave_dev->ethtool_ops->get_flags &&
+       if (slave_dev->ethtool_ops && slave_dev->ethtool_ops->get_flags &&
            slave_dev->ethtool_ops->set_flags) {
                orig_flags = slave_dev->ethtool_ops->get_flags(slave_dev);      
                if (bond_dev->features & NETIF_F_LRO)
Comment 4 RHEL Program Management 2012-11-09 07:11:09 UTC 
This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.
Comment 5 Thomas Graf 2012-11-09 09:24:02 UTC 
Requesting exception due to regression
Comment 6 Thomas Graf 2012-11-09 13:07:14 UTC 
*** Bug 874578 has been marked as a duplicate of this bug. ***
Comment 8 Jarod Wilson 2013-01-16 17:52:16 UTC 
Patch(es)
Comment 11 Zhenjie Chen 2013-01-21 02:48:55 UTC 
Tested on 2.6.32-355.el6.x86_64

[root@lenovo-thinkstation-01 ~]# uname -r
2.6.32-355.el6.x86_64
[root@lenovo-thinkstation-01 ~]# modprobe dummy
[root@lenovo-thinkstation-01 ~]# modprobe bonding
802.1Q VLAN Support v1.8 Ben Greear <greearb>
All bugs added by David S. Miller <davem>
Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009)
[root@lenovo-thinkstation-01 ~]# ifconfig bond0 up
ADDRCONF(NETDEV_UP): bond0: link is not ready
8021q: adding VLAN 0 to HW filter on device bond0
[root@lenovo-thinkstation-01 ~]# ifenslave bond0 dummy0
New slave device dummy0 does not support netpoll
Disabling netpoll support for bond0
bonding: bond0: enslaving dummy0 as an active interface with an up link.
ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[root@lenovo-thinkstation-01 ~]# cat /proc/net/bonding/bond0 
Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009)

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 0
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: dummy0
MII Status: up
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 1e:7b:67:63:19:10
Slave queue ID: 0


Set VERIFIED
Comment 13 errata-xmlrpc 2013-02-21 06:55:20 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0496.html
Comment 14 Veaceslav Falico 2013-07-29 14:37:10 UTC 
*** Bug 989505 has been marked as a duplicate of this bug. ***
Note You need to log in before you can comment on or make changes to this bug.