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Bug 473408

Summary: Prolonged network blackout during migration of RHEL 4.7
Product: Red Hat Enterprise Linux 4 Reporter: Ian Campbell <ijc>
Component: kernel-xenAssignee: Xen Maintainance List <xen-maint>
Status: CLOSED DUPLICATE QA Contact: Martin Jenner <mjenner>
Severity: high Docs Contact:
Priority: medium    
Version: 4.7CC: ddutile, xen-maint
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2008-12-01 17:08:54 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
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Description Flags
Use register_netdevice_notifier not register_inetaddr_notifier none

Description Ian Campbell 2008-11-28 11:22:12 UTC 
After a live migration of a 2.6.9-78.EL kernel we are seeing network blackouts on the order of several minutes. It appears that the gratuituous ARP is not being sent at all.

In 2.6.9-72.EL RHEL 4 bug #444473 was closed after applying the patch from #441716 comment #5 however #441716 comment #6 points out that this doesn't work due to "silly cut and paste errors" and proposes an updated patch instead, this is the one which is in RHEL 5 currently. I've patched in the difference between the two (basically turning register_inetaddr_notifier into  register_netdevice_notifier) onto 2.6.9-78.0.5.EL and it seems to repair things.
Comment 1 Ian Campbell 2008-11-28 11:22:56 UTC 
Created attachment 324981 [details]
Use register_netdevice_notifier not register_inetaddr_notifier
Comment 3 Herbert Xu 2008-11-28 12:35:10 UTC 
Already fixed in 78-15.  As to whether the fix will make it to RHEL4.7 I'm afraid I'm qualified to answer.
Comment 4 Ian Campbell 2008-11-28 13:40:40 UTC 
Thanks. Is there a bugzilla entry already? I searched before I filed this but didn't find it.
Comment 5 Don Dutile (Red Hat) 2008-12-01 17:08:54 UTC 
the bz that fixed this problem is 460874.

It is being backported to the 4.7-z stream release under bz 469891.

Closing this bz as a dupe of 460874 & 469891.

- Don

*** This bug has been marked as a duplicate of bug 460874 ***