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

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Date:	Sun, 17 Mar 2013 08:53:10 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	dormando <dormando@...ia.net>,
	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 Sun, Mar 17, 2013 at 07:39:48AM +0100, Hannes Frederic Sowa wrote:
> On Sat, Mar 16, 2013 at 10:36:06AM -0700, Eric Dumazet wrote:
> > On Fri, 2013-03-15 at 00:19 +0100, Eric Dumazet wrote:
> > 
> > > Thanks thats really useful, we might miss to increment socket refcount
> > > in a timer setup.
> > > 
> > 
> > Hmm, please add following debugging patch as well
> > 
> > diff --git a/include/net/sock.h b/include/net/sock.h
> > index 14f6e9d..fe7c8a6 100644
> > --- a/include/net/sock.h
> > +++ b/include/net/sock.h
> > @@ -530,7 +530,9 @@ static inline void sock_hold(struct sock *sk)
> >   */
> >  static inline void __sock_put(struct sock *sk)
> >  {
> > -	atomic_dec(&sk->sk_refcnt);
> > +	int newref = atomic_dec_return(&sk->sk_refcnt);
> > +
> > +	BUG_ON(newref <= 0);
> >  }
> 
> Couldn't it also be a free from sock_wfree where the wmem accounting went
> wrong? It does not care about reference counts there.

nvm, it had to be in the stacktrace then.
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