From: ebiederm@xmission•com (Eric W. Biederman)
To: Brian Haley <brian.haley@hp•com>
Cc: netdev@vger•kernel.org, Mahesh Kelkar <maheshkelkar@gmail•com>,
Lorenzo Colitti <lorenzo@google•com>
Subject: Re: echo > 0 .../disable_ipv6 broken in 2.6.37-rc4
Date: Wed, 08 Dec 2010 13:29:52 -0800 [thread overview]
Message-ID: <m14oaoeywf.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4CFD0AF0.9090809@hp.com> (Brian Haley's message of "Mon, 06 Dec 2010 11:10:24 -0500")
Brian Haley <brian.haley@hp•com> writes:
> 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?
The address never went away, and I don't think we have a route to ::1.
Playing with this a little more if I delete the address and then bounce
the interface ping ::1 works again. So something is just not getting
reinitialized.
Unfortunately I don't see anything obvious. I'm still scratching my
head.
>> 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.
Agreed. I don't have problems on 2.6.33 either, but because of overload
I haven't been doing regular testing of the kernels inbetween.
Eric
next prev parent reply other threads:[~2010-12-08 21:29 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-06 0:24 echo > 0 .../disable_ipv6 broken in 2.6.37-rc4 Eric W. Biederman
2010-12-06 0:33 ` Lorenzo Colitti
2010-12-06 0:39 ` Eric W. Biederman
2010-12-06 5:51 ` Eric W. Biederman
2010-12-06 16:10 ` Brian Haley
2010-12-08 21:29 ` Eric W. Biederman [this message]
2010-12-08 22:49 ` Brian Haley
2010-12-08 23:13 ` Eric W. Biederman
2010-12-08 23:49 ` Stephen Hemminger
2010-12-09 2:42 ` Eric W. Biederman
2010-12-09 3:18 ` Eric W. Biederman
2010-12-09 4:16 ` [PATCH] Fix 2.6.34-rc1 regression in disable_ipv6 support Eric W. Biederman
2010-12-09 15:28 ` Brian Haley
2010-12-09 16:27 ` Stephen Hemminger
2010-12-09 19:22 ` Eric W. Biederman
2010-12-09 19:09 ` Eric W. Biederman
2010-12-09 19:16 ` Stephen Hemminger
2010-12-09 19:31 ` Eric W. Biederman
2010-12-09 20:20 ` David Miller
2010-12-09 20:20 ` David Miller
2010-12-09 22:51 ` Stephen Hemminger
2010-12-16 21:28 ` [RFC] ipv6: don't flush routes when setting loopback down Stephen Hemminger
2010-12-16 23:17 ` Eric W. Biederman
2010-12-17 1:18 ` Eric W. Biederman
2010-12-17 2:26 ` David Miller
2011-01-19 19:18 ` Jiri Bohac
2011-01-19 19:38 ` Stephen Hemminger
2011-01-19 19:56 ` Jiri Bohac
2011-01-19 20:01 ` Stephen Hemminger
2011-01-22 8:17 ` Eric W. Biederman
2011-01-22 22:39 ` Stephen Hemminger
2011-01-22 22:54 ` David Miller
2011-01-23 4:41 ` Stephen Hemminger
2011-01-23 5:42 ` David Miller
2011-01-23 8:24 ` Stephen Hemminger
2011-01-23 8:26 ` Stephen Hemminger
2011-01-23 9:15 ` [stable] " Willy Tarreau
2011-01-23 9:21 ` Stephen Hemminger
2011-01-23 10:34 ` Stephen Hemminger
2011-01-23 19:21 ` Eric W. Biederman
2011-01-23 19:57 ` [stable] " David Miller
2011-01-23 19:48 ` David Miller
2011-01-23 19:47 ` David Miller
2010-12-10 4:02 ` [PATCH] Fix 2.6.34-rc1 regression in disable_ipv6 support Stephen Hemminger
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