netdev - RE: nfs client hang

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Date:	Wed, 28 Jul 2010 08:24:09 +0100
From:	Andy Chittenden <andyc@...earc.com>
To:	Andy Chittenden <andyc@...earc.com>,
	Chuck Lever <chuck.lever@...cle.com>,
	Eric Dumazet <eric.dumazet@...il.com>
CC:	"Linux Kernel Mailing List (linux-kernel@...r.kernel.org)" 
	<linux-kernel@...r.kernel.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	netdev <netdev@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: RE: nfs client hang

resending as it seems to have been corrupted on LKML!

> The RPC client marks the socket closed. and the linger timeout is 
> cancelled.  At this point, sk_shutdown should be set to zero, correct? 
> I don't see an xs_error_report() call here, which would confirm that the 
> socket took a trip through tcp_disconnect().

From my reading of tcp_disconnect(), it calls sk->sk_error_report(sk) unconditionally so as there's no xs_error_report(), that surely means the exact opposite: tcp_disconnect() wasn't called. If it's not called, sk_shutdown is not cleared. And my revised tracing confirmed that it was set to 
SEND_SHUTDOWN.

-- 
Andy, BlueArc Engineering