netdev - Re: dst refcount is -1

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Message-ID: <305d3a86-7dc7-d131-dc1f-a7086fc1e2b3@odi.ch>
Date:   Tue, 19 Dec 2017 21:02:52 +0100
From:   Ortwin Glück <odi@....ch>
To:     Wei Wang <weiwan@...gle.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: dst refcount is -1

On 12/19/2017 07:09 PM, Wei Wang wrote:
> Would you give more details under what circumstances it happened?

Circumstances are unknown as I can't correlate that log line to anything else. 
If I have to guess, then it has to do with ipsec events. These tunnel tend to go 
up and down a lot and there is steady traffic on most of them.

> What kind of traffic is running? IPv4? IPv6? Or Both? Do you use xfrm?

The machine has 10 IPv4 interfaces (via usb) and runs about 30 ipsec VPNs with 
total maybe 200 tunnels (xfrm). No real IPv6 traffic, just the usual link-local 
stuff that you see on any network.

Ortwin