From: Bernd Schubert <bernd-schubert@gmx.de>
Subject: Re: Bug starting 2.6.16 - rpc: bad TCP reclen
Date: Thu, 20 Jul 2006 10:38:16 +0200
Message-ID: <200607201038.16637.bernd-schubert@gmx.de>
References: <44BCC7A1.30104@plutohome.com> <44BE5538.4080508@plutohome.com>
	<17599.1679.768863.576310@cse.unsw.edu.au>
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Cc: Neil Brown <neilb@suse.de>, Chuck Lever <chucklever@gmail.com>
To: nfs@lists.sourceforge.net
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> The message means that data on the TCP connection is corrupted.
> With tcp, every RPC message is prefixed by a 4 byte header.
> The msb of this number is set to one to show it is the last of a
> sequence of fragments (we don't support multiple rpc-fragments).  The
> rest of the number is the number of bytes in the RPC message.
> This should be less than about 32000 as we don't support any messages
> bigger than this.  You are seeing number with the msb clear, and
> numbers bigger than 32000.
>
> It is very probably that this is not the first corruption in the TCP
> stream, just the first that is being reported.  I have no idea where
> the corruption could be coming from.
>

Wouldn't tcp errors corrected get corrected by the tcp checksum (retransmit=
)? =

At least thats what my text book is saying.

We are occasionally seeing those messages, too. Don't know how to reproduce =

it, though. =


on our fileserver fileserver: RPC: bad TCP reclen 0x040d0a0d (non-terminal)=
  =

on our compute cluster server: RPC: bad TCP reclen 0x2dacc6c9 (large)

Here its not related to 2.6.16 only. The compute cluster server shows those =

messages - both server and clients are using 2.6.15. Until recently it run =

2.6.11 and we never had those messages that time.
Our main fileserver is running 2.6.13, most clients still 2.6.11 and some =

clients 2.6.16. As far as I remember, those messages began when we updated =

the clients from 2.6.11 to 2.6.16.

Thanks,
	Bernd

-- =

Bernd Schubert
PCI / Theoretische Chemie
Universit=E4t Heidelberg
INF 229
69120 Heidelberg


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