netdev - Re: [Bugme-new] [Bug 7817] New: commit edfe21a29b1dca9ce5a938317868066d2e21c385 breaks IPv6 address autoconfiguration

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Message-Id: <20070113134506.6021cf79.akpm@osdl.org>
Date:	Sat, 13 Jan 2007 13:45:06 -0800
From:	Andrew Morton <akpm@...l.org>
To:	netdev@...r.kernel.org
Cc:	yoshfuji@...ux-ipv6.org, gernoth@...ormatik.uni-erlangen.de,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>
Subject: Re: [Bugme-new] [Bug 7817] New: commit
 edfe21a29b1dca9ce5a938317868066d2e21c385 breaks IPv6 address
 autoconfiguration

> On Sat, 13 Jan 2007 05:44:39 -0800 bugme-daemon@...zilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=7817
> 
>            Summary: commit edfe21a29b1dca9ce5a938317868066d2e21c385 breaks
>                     IPv6 address autoconfiguration
>     Kernel Version: 2.6.19.2
>             Status: NEW
>           Severity: high
>              Owner: yoshfuji@...ux-ipv6.org
>          Submitter: gernoth@...ormatik.uni-erlangen.de
> 
> 
> Most recent kernel where this bug did *NOT* occur: 2.6.19.1
> Distribution: Debian Testing
> Hardware Environment: About 100 different x86 boxes
> Software Environment: no special software involved, just the kernel. No modules are loaded on the 
> affected machines (everything needed is built into the kernel)
> 
> Problem Description:
> After booting kernel 2.6.19.2 on our machines they no longer do IPv6 address autoconfiguration, 
> although router advertisments can be seen on that interface:
> 14:19:14.254410 fe80::212:1eff:fe08:e040 > ip6-allnodes: icmp6: router advertisement(chlim=64, 
> pref=medium, router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr: 00:12:1e:08:e0:40)
> [ndp opt] (len 56, hlim 255)
> 
> ip -6 addr output is:
> 1: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000
>     inet6 fe80::209:3dff:fe10:ccda/64 scope link
>        valid_lft forever preferred_lft forever
> 2: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000
>     inet6 fe80::209:3dff:fe10:ccdb/64 scope link
>        valid_lft forever preferred_lft forever
> 3: lo: <LOOPBACK,UP,10000> mtu 16436
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> (eth0 sees the advertisments)
> 
> Manually setting the address and default-route works.
> Reverting commit edfe21a29b1dca9ce5a938317868066d2e21c385 fixes this problem.
> 
> Steps to reproduce:
> 1. Upgrade to 2.6.19.2
> 2. Configure an interface for IPv4
> 3. The linklocal IPv6 address for the interface appears in ip -6 addr
> 4. Wait for a router advertisment
> 5. No Global IPv6 address and no IPv6 default route is set
> 
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