netdev - Re: echo > 0 .../disable_ipv6 broken in 2.6.37-rc4

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Message-ID: <4CFD0AF0.9090809@hp.com>
Date:	Mon, 06 Dec 2010 11:10:24 -0500
From:	Brian Haley <brian.haley@...com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	netdev@...r.kernel.org, Mahesh Kelkar <maheshkelkar@...il.com>,
	Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: echo > 0 .../disable_ipv6 broken in 2.6.37-rc4

On 12/05/2010 07:24 PM, Eric W. Biederman wrote:
> 
> In 2.6.37-rc4 ipv6 can be disabled not enabled.
> The last kernel I have tested and know this works on is 2.6.33.
> 
> To reproduce:
>    ~ # ip link set lo up
>    ~ # ping6 ::1
>    PING ::1(::1) 56 data bytes
>    64 bytes from ::1: icmp_seq=1 ttl=64 time=0.026 ms
>    ^C
>    --- ::1 ping statistics ---
>    1 packets transmitted, 1 received, 0% packet loss, time 782ms
>    rtt min/avg/max/mdev = 0.026/0.026/0.026/0.000 ms
>    ~ # echo 1 > /proc/sys/net/ipv6/conf/lo/disable_ipv6 
>    ~ # ping6 ::1
>    connect: Network is unreachable
>    ~ # echo 0 > /proc/sys/net/ipv6/conf/lo/disable_ipv6 
>    ~ # ping6 ::1
>    connect: Network is unreachable
> 
> 
> I intend to poke at this a little more but at the moment
> I am drawing a blank at what is going on.

It should just be calling addrconf_notify() with either NETDEV_UP
or NETDEV_DOWN.  Does the address not come back?  Or the route?

> I intend to keep poking at this but if anyone can figure this out
> before I do I would be greatly appreciative.

I'm pulling the latest tree now, my 2.6.32.24 system is running fine, so
it's something after that.

-Brian
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