netdev - Re: [PATCH v3 net-next 00/23] net: add preliminary netdev refcount tracking

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Message-ID: <CANn89i+b_6R820Om9ZjK-E5DyvnNUKXxYODpmt1B6UHM1q7eoQ@mail.gmail.com>
Date:   Mon, 6 Dec 2021 16:17:11 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v3 net-next 00/23] net: add preliminary netdev refcount tracking

On Mon, Dec 6, 2021 at 4:12 PM Andrew Lunn <andrew@...n.ch> wrote:
>
>
> Hard to say. It looks like some sort of race condition. Sometimes when
> i shut down the GNS3 simulation, i get the issues, sometimes not. I
> don't have a good enough feeling to say either way, is it an existing
> problem, or it is my code which is triggering it.

OK got it.

I think it might be premature to use ref_tracker yet, until we also
have the netns one.
(Seeing the netns change path from your report, this might be relevant)

Path series adding netns tracking:

1fe7f3e6bf91 net: add networking namespace refcount tracker
14d34ec0eaad net: add netns refcount tracker to struct sock
648e1c8128a1 net: add netns refcount tracker to struct seq_net_private
fa5ec9628f3e net: sched: add netns refcount tracker to struct tcf_exts
fa9f11a0a627 netfilter: nfnetlink: add netns refcount tracker to
struct nfulnl_instance
8e3bbdc619d0 l2tp: add netns refcount tracker to l2tp_dfs_seq_data
323fd18ce64c ppp: add netns refcount tracker
d01d6c0df780 netfilter: nf_nat_masquerade: add netns refcount tracker
to masq_dev_work
1b7051234a99 SUNRPC: add netns refcount tracker to struct svc_xprt
44721a730a24 SUNRPC: add netns refcount tracker to struct gss_auth
648e8fd765b7 SUNRPC: add netns refcount tracker to struct rpc_xprt
c1d5973f3af0 net: initialize init_net earlier
75285dbd40cd net: add netns refcount tracker to struct nsproxy
0fbde1282785 vfs: add netns refcount tracker to struct fs_context
5a0c6bd0445f audit: add netns refcount tracker to struct audit_net
145f70501bfb audit: add netns refcount tracker to struct audit_reply
b5af80d1c341 audit: add netns refcount tracker to struct audit_netlink_list