netdev - Re: [PATCH v3 2/2 RESEND] resolve gtp possible deadlock warning

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Message-ID: <17c1f52d-e032-44c1-8f56-34d5cd8e30ac@linux.alibaba.com>
Date: Tue, 22 Oct 2024 10:00:09 +0800
From: "D. Wythe" <alibuda@...ux.alibaba.com>
To: Daniel Yang <danielyangkang@...il.com>,
 Wenjia Zhang <wenjia@...ux.ibm.com>, Jan Karcher <jaka@...ux.ibm.com>,
 Tony Lu <tonylu@...ux.alibaba.com>, Wen Gu <guwen@...ux.alibaba.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 linux-s390@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: syzbot+e953a8f3071f5c0a28fd@...kaller.appspotmail.com
Subject: Re: [PATCH v3 2/2 RESEND] resolve gtp possible deadlock warning

On 10/16/24 6:48 AM, Daniel Yang wrote:
> From: Daniel Yang <danielyangkang@...il.com>
> 
> Moved lockdep annotation to separate function for readability.
> 
> Signed-off-by: Daniel Yang <danielyangkang@...il.com>
> Reported-by: syzbot+e953a8f3071f5c0a28fd@...kaller.appspotmail.com
> 
> ---
>   net/smc/smc_inet.c | 28 +++++++++++++++-------------
>   1 file changed, 15 insertions(+), 13 deletions(-)
> 
> diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
> index 7ae49ffd2..b3eedc3b0 100644
> --- a/net/smc/smc_inet.c
> +++ b/net/smc/smc_inet.c
> @@ -111,18 +111,7 @@ static struct inet_protosw smc_inet6_protosw = {
>   static struct lock_class_key smc_slock_keys[2];
>   static struct lock_class_key smc_keys[2];
>   
> -static int smc_inet_init_sock(struct sock *sk)
> -{
> -	struct net *net = sock_net(sk);
> -	int rc;
> -
> -	/* init common smc sock */
> -	smc_sk_init(net, sk, IPPROTO_SMC);
> -	/* create clcsock */
> -	rc = smc_create_clcsk(net, sk, sk->sk_family);
> -	if (rc)
> -		return rc;
> -
> +static inline void smc_inet_lockdep_annotate(struct sock *sk) {
>   	switch (sk->sk_family) {
>   		case AF_INET:
>   			sock_lock_init_class_and_name(sk, "slock-AF_INET-SMC",
> @@ -139,8 +128,21 @@ static int smc_inet_init_sock(struct sock *sk)
>   		default:
>   			WARN_ON_ONCE(1);
>   	}
> +}
>   
> -	return 0;
> +static int smc_inet_init_sock(struct sock *sk)
> +{
> +	struct net *net = sock_net(sk);
> +	int rc;
> +
> +	/* init common smc sock */
> +	smc_sk_init(net, sk, IPPROTO_SMC);
> +	/* create clcsock */
> +	rc = smc_create_clcsk(net, sk, sk->sk_family);
> +	if (!rc)
> +		smc_inet_lockdep_annotate(sk);
> +
> +	return rc;
>   }
>   
>   int __init smc_inet_init(void)

I need to check why you said Wang Cong's patch cannot fix the issue.
As soon as I reach a conclusion, I'll inform you right away.

D. Wythe