netdev - Re: BUG: IPv4: Attempt to release TCP socket in state 1

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Date:	Thu, 07 Mar 2013 05:46:30 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	dormando <dormando@...ia.net>
Cc:	Cong Wang <xiyou.wangcong@...il.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: BUG: IPv4: Attempt to release TCP socket in state 1

On Wed, 2013-03-06 at 16:41 -0800, dormando wrote:

> Ok... bridge module is loaded but nothing seems to be using it. No
> bond/tunnels/anything enabled. I couldn't quickly figure out what was
> causing it to load.
> 
> We removed the need for macvlan, started machines with a fresh boot, and
> they still crashed without it, after a few hours.
> 
> Unfortunately I just saw a machine crash in the same way on 3.6.6 and
> 3.6.9. I'm working on getting a completely pristine 3.6.6 and 3.6.9
> tested. Our patches are minor but there were a few, so I'm backing it all
> out just to be sure.
> 
> Is there anything in particular which is most interesting? I can post lots
> and lots and lots of information. Sadly bridge/macvlan weren't part of the
> problem. .config, sysctls are easiest I guess? When this "hang" happens
> the machine is still up somewhat, but we lose access to it. Syslog is
> still writing entries to disk occasionally, so it's possible we could set
> something up to dump more information.
> 
> It takes a day or two to cycle this, so it might take a while to get
> information and test crashes.

Thanks !

Please add a stack trace, it might help :

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 68f6a94..1d4d97e 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -141,8 +141,9 @@ void inet_sock_destruct(struct sock *sk)
 	sk_mem_reclaim(sk);
 
 	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
-		pr_err("Attempt to release TCP socket in state %d %p\n",
-		       sk->sk_state, sk);
+		pr_err("Attempt to release TCP socket family %d in state %d %p\n",
+		       sk->sk_family, sk->sk_state, sk);
+		WARN_ON_ONCE(1);
 		return;
 	}
 	if (!sock_flag(sk, SOCK_DEAD)) {



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