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Thanks Brian for the reply.
I recently moved from nova-network to neutron and i am still struggling to
understand neutron.
As per my limited understanding subnets can be duplicated and vlan tag will
prevent duplicate ips from communicating.In my setup i can see tap
interface connected with a tag of 1144  to br-int and GRE tunnels are used
for carrying traffic to compute nodes.In that case could you please tell me
what duplicate ips are you mentioning here.I thought it must be a bug in
neutron that is allowing duplicate ipv6 to communicate.But with vlan tag
even ipv6 should not communicate directly. Confused O_0

On Wed, Nov 18, 2015 at 8:28 PM, Brian Haley <brian.haley at hpe.com> wrote:

> On 11/18/2015 07:33 AM, kevin parrikar wrote:
>
>> i am trying Juno *without *DVR and there are around 500 sub nets in each
>> network
>>
>> node.
>>
>> Network nodes have 500+ dnsmasq process which are configured to give
>> ipv6,ipv4
>> addresses out of this some fluctuates between D and S state while others
>> are in
>> continuous S state.Probably because of too many processes in D state with
>> "rtnetlink_rcv" in "wchan" its showing very high load average.
>>
>>
>> functions in stack when in D state:
>>
>> [<ffffffff816360a9>] rtnetlink_rcv+0x19/0x30
>> [<ffffffff81653e25>] netlink_unicast+0xd5/0x1b0
>> [<ffffffff8165420e>] netlink_sendmsg+0x30e/0x680
>> [<ffffffff8160e32b>] sock_sendmsg+0x8b/0xc0
>> [<ffffffff8160e871>] SYSC_sendto+0x121/0x1c0
>> [<ffffffff8160f25e>] SyS_sendto+0xe/0x10
>> [<ffffffff817342dd>] system_call_fastpath+0x1a/0x1f
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> but in couple of seconds it changes to S state with this in stack,all idle
>> process have this in stack.
>>
>> [<ffffffff811d20d9>] poll_schedule_timeout+0x49/0x70
>> [<ffffffff811d2ac6>] do_select+0x5b6/0x780
>> [<ffffffff811d2e5c>] core_sys_select+0x1cc/0x2e0
>> [<ffffffff811d301b>] SyS_select+0xab/0x100
>> [<ffffffff817342dd>] system_call_fastpath+0x1a/0x1f
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> interface in which dnsmasq is listening has " tentative dadfailed" in
>> "scope
>> global" for ipv6 for all the dnsmasq process that are in D state.
>>
>> i don't understand why duplicate ipv6 issue is coming when there are vlan
>> tags
>> to separate each sub net.For ipv4 duplicate IP issue is not coming for
>> same subnet.
>>
>
> DAD failure is fatal for the address, as it won't be tried again without
> bouncing the interface or tweaking the disable_ipv6 sysctl on the
> interface. The "tentative" flag is just showing it is still in that state
> (i.e. waiting for DAD to complete).  Figuring out why this is happening
> will most likely solve your problem, but there isn't enough here to go on.
>
> The fact that you don't see an IPv4 'duplicate' message is that it's not
> going to typically do it, so you could have a duplicate there and just not
> know it.
>
> I'd say to try Kilo or Liberty, but it's unclear if this is a Neutron
> issue or something more basic with your setup.
>
> -Brian
>
>
> Not able to understand why dnsmasq that are connected to interfaces that
>> have
>> "tentative dadfailed " continuously changes between S and D state while
>> others
>> are idle.
>>
>> attached is the strace while dnsmasq is in D state.
>>
>> Any idea about this issue?
>>
>>
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