linux-kernel - Re: [syzbot] Re: [syzbot] [net?] possible deadlock in rtnl

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Message-ID: <000000000000acfb4e0621d4e20a@google.com>
Date: Wed, 11 Sep 2024 02:48:00 -0700
From: syzbot <syzbot+51cf7cc5f9ffc1006ef2@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Re: [syzbot] [net?] possible deadlock in rtnl_lock (8)

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***

Subject: Re: [syzbot] [net?] possible deadlock in rtnl_lock (8)
Author: alibuda@...ux.alibaba.com

#syz test

Make Lockdep happy with IPPROTO_SMC

---
  net/smc/smc_inet.c | 17 ++++++++++++++++-
  1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/net/smc/smc_inet.c b/net/smc/smc_inet.c
index bece346..281f0450 100644
--- a/net/smc/smc_inet.c
+++ b/net/smc/smc_inet.c
@@ -102,14 +102,29 @@
  };
  #endif /* CONFIG_IPV6 */

+static struct lock_class_key smc_clcsk_slock_keys[2];
+static struct lock_class_key smc_clcsk_keys[2];
+
  static int smc_inet_init_sock(struct sock *sk)
  {
+   bool is_ipv6 = sk->sk_family == AF_INET6;
     struct net *net = sock_net(sk);
+   int rc;

     /* init common smc sock */
     smc_sk_init(net, sk, IPPROTO_SMC);
     /* create clcsock */
-   return smc_create_clcsk(net, sk, sk->sk_family);
+   rc = smc_create_clcsk(net, sk, sk->sk_family);
+   if (rc)
+       return rc;
+
+   sock_lock_init_class_and_name(smc_sk(sk)->clcsk,
+                     is_ipv6 ? "slock-AF_INET6-SMC-CLCSK" : 
"slock-AF_INET-SMC-CLCSK",
+                     &smc_clcsk_slock_keys[is_ipv6],
+                     is_ipv6 ? "sk_lock-AF_INET6-SMC-CLCSK" : 
"sk_lock-AF_INET-SMC-CLCSK",
+                     &smc_clcsk_keys[is_ipv6]);
+
+   return 0;
  }

  int __init smc_inet_init(void)
-- 
1.8.3.1