Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 24 Jan 2003 20:51:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 24 Jan 2003 20:51:34 -0500 Received: from mx1.redhat.com ([66.187.233.31]:40720 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id ; Fri, 24 Jan 2003 20:51:32 -0500 Date: Fri, 24 Jan 2003 21:00:51 -0500 From: Christopher Faylor To: linux-kernel@vger.kernel.org Subject: Re: SSH Hangs in 2.5.59 and 2.5.55 (TCP_NODELAY?) Message-ID: <20030125020051.GA14616@redhat.com> References:

<20030124211523.GA14229@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030124211523.GA14229@redhat.com> User-Agent: Mutt/1.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 24, 2003 at 04:15:23PM -0500, Christopher Faylor wrote: >On Fri, Jan 24, 2003 at 01:46:10PM -0700, lost@l-w.net wrote: >>On Fri, 24 Jan 2003, David C Niemi wrote: >> >>> I have been experiencing some baffling SSH client hangs under 2.5.59 (and >>> 55) in which the session totally hangs up after I have typed (typically) >>> 10-100 characters. Right before it hangs permanently, a character is >>> echo'd back to the screen several seconds late. Interestingly, data due >>> back for my client which is initiated by the server side does make it, I >>> just can't type anything further. >> >> >> >>> Neither "ifconfig" nor dmesg show *any* errors whatsoever. >>> >>> Anyone else seeing SSH client hangs to nonlocal hosts under 2.5.59? >> >>I'm seeing the same problem with a D-Link NIC (8139too driver). Exact same >>symptoms - a delayed echo followed by no further echos. Checking netstat >>shows an output queue for the socket but it never transmits anything. >>Messages echoed by the remote server also make it through the connection. > >I hate "me toos" but maybe this will provide some useful data. > >I'm seeing the same thing with a 3c59x driver. I couldn't reproduce the >problem with a tulip driver when I connect my laptop directly to my >cable modem. The problem only occurs when going through the laptop >(which acts as a firewall, running netfilter) to a remote site, in my >case the site is sources.redhat.com. Checking the strace log between telnet and ssh, I noticed that ssh does this: setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0 while telnet doesn't. If I introduce that call into telnet, it seems to hang eventually too in the same way as ssh. cgf - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/