netdev - Re: nfs client hang

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Date:	Wed, 28 Jul 2010 13:37:20 -0400
From:	Chuck Lever <chuck.lever@...cle.com>
To:	Andy Chittenden <andyc@...earc.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	"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

On 07/28/10 03:24 AM, Andy Chittenden wrote:
> 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.

Sorry, that's what I meant above.

An xs_error_report() debugging message at that point in the log would 
confirm that the socket took a trip through tcp_disconnect().  But I 
don't see such a message.
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