netdev - Re: kernel panic receiving flooded VXLAN traffic with OVS

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Message-ID: <CALnjE+q1t0dbC6-EvxsQvvNafKsk2HNKXBjDrALA9S-gon68PQ@mail.gmail.com>
Date:	Fri, 7 Nov 2014 15:06:46 -0800
From:	Pravin Shelar <pshelar@...ira.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	Jay Vosburgh <jay.vosburgh@...onical.com>,
	netdev <netdev@...r.kernel.org>,
	"discuss@...nvswitch.org" <discuss@...nvswitch.org>
Subject: Re: kernel panic receiving flooded VXLAN traffic with OVS

On Fri, Nov 7, 2014 at 2:29 PM, Jesse Gross <jesse@...ira.com> wrote:
> On Fri, Nov 7, 2014 at 1:13 PM, Jay Vosburgh <jay.vosburgh@...onical.com> wrote:
>> Jesse Gross <jesse@...ira.com> wrote:
>>
>>>On Fri, Nov 7, 2014 at 10:34 AM, Jesse Gross <jesse@...ira.com> wrote:
>>>> On Fri, Nov 7, 2014 at 9:40 AM, Pravin Shelar <pshelar@...ira.com> wrote:
>>>>> On Thu, Nov 6, 2014 at 5:58 PM, Jay Vosburgh <jay.vosburgh@...onical.com> wrote:
>> [...]
>>>>>>         I'm not sure if this is an error on the part of the RX / GRO
>>>>>> processing in assembling the GRO skb, or in how OVS calls skb_segment.
>>>>>>
>>>>>
>>>>> I think this is related skb_segment() issue where it is not able to
>>>>> handle this type of skb geometry. We need to fix skb-segmentation. I
>>>>> will investigate it more.
>>>>
>>>> One problem that I see is that vxlan_gro_complete() doesn't add
>>>> SKB_GSO_UDP_TUNNEL to gso_type. This causes us to attempt
>>>> fragmentation as UDP rather than continuing down to do TCP
>>>> segmentation. That probably screws up the skb geometry.
>>>
>>>I sent out a patch to fix this issue. I'm pretty sure that it is the
>>>root cause of the originally reported case but I don't have a good way
>>>to reproduce it so it would be great if you could test it Jay.
>>
>>         I'm having an issue there; when I set up my recreation on
>> current net-next (3.18-rc2) without your new patch, I get the following
>> oops when my ovs script does "ovs-vsctl --if-exists del-br br-ex":
>
> Hmm, that looks like a totally different problem. Pravin - any ideas?

I am not able to reproduce with above command. Jay, Can you send me
steps to reproduce this issue?

Thanks,
Pravin.
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