netdev - Re: It's back! (Re: [REGRESSION] NFS is creating a hidden port (left over from xs

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Date:	Thu, 30 Jun 2016 12:24:10 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Trond Myklebust <trondmy@...marydata.com>
Cc:	Jeff Layton <jlayton@...chiereds.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Schumaker Anna <anna.schumaker@...app.com>,
	"Linux NFS Mailing List" <linux-nfs@...r.kernel.org>,
	"Linux Network Devel Mailing List" <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	Fields Bruce <bfields@...ldses.org>
Subject: Re: It's back! (Re: [REGRESSION] NFS is creating a hidden port
 (left over from xs_bind() ))

On Thu, 30 Jun 2016 11:23:41 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:


> I can add more trace_printk()s if it would help.

I added a trace_printk() in inet_bind_bucket_destroy() to print out
some information on the socket used by xs_bind(), and it shows that the
bind destroy is called, but the list is not empty.



/*
 * Caller must hold hashbucket lock for this tb with local BH disabled
 */
void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
{
	if (!current->mm && xs_port == tb->port) {
		trace_printk("destroy %d empty=%d %p\n",
			     tb->port, hlist_empty(&tb->owners), tb);
		trace_dump_stack(1);
	}
	if (hlist_empty(&tb->owners)) {
		__hlist_del(&tb->node);
		kmem_cache_free(cachep, tb);
	}
}

I created "xs_port" to hold the port of the variable used by xs_bind,
and when it is called, the hlist_empty(&tb->owners) returns false.

I'll add more trace_printks to find out where those owners are being
added.

-- Steve