From owner-freebsd-bugs@FreeBSD.ORG Thu Feb 24 14:30:37 2005 Return-Path: Delivered-To: freebsd-bugs@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id F285516A4CE for ; Thu, 24 Feb 2005 14:30:36 +0000 (GMT) Received: from cyrus.watson.org (cyrus.watson.org [204.156.12.53]) by mx1.FreeBSD.org (Postfix) with ESMTP id B7DCD43D2D for ; Thu, 24 Feb 2005 14:30:36 +0000 (GMT) (envelope-from robert@fledge.watson.org) Received: from fledge.watson.org (fledge.watson.org [204.156.12.50]) by cyrus.watson.org (Postfix) with SMTP id F2BF546B0F; Thu, 24 Feb 2005 09:30:35 -0500 (EST) Date: Thu, 24 Feb 2005 14:28:52 +0000 (GMT) From: Robert Watson X-Sender: robert@fledge.watson.org To: Dental-on-line In-Reply-To: <421DAE3F.8030103@dental-on-line.fr> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-bugs@freebsd.org Subject: Re: ssh sbwait indfinite timeout on SMP machines X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Feb 2005 14:30:37 -0000 On Thu, 24 Feb 2005, Dental-on-line wrote: > We are using two SMP machines (Dell 1750) with 5.3_p2 RELENG and have > timeout problems with SSH. > > This problem happens ONLY on SMP machines not uniprocessor ones. Could you try the following things: - Boot the box with the debug.mpsafenet=0 tunable set in loader.conf and see if the problem recurs? - Update to 5-STABLE and try with and without debug.mpsafenet=0? A number of TCP locking changes have been made there, and one may help. Does it happen for every SSH session, or only some? Thanks, Robert N M Watson > > This problem is reproductible using the following steps: > > Connect to the host and when asked for the password type Ctrl-C. On a > uniprocessor machine you will have a CLOSE-WAIT timeout that timeouts > :-) after one or two minutes. Not so on an SMP machine, the CLOSE-WAIT > state lasts forever. > > The problem is if you have more than 10 sessions that fail in the same > situation your host ssh daemon is no more usable and you must kill it. > > Thanks, > Cyril Elkaim > _______________________________________________ > freebsd-bugs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs > To unsubscribe, send any mail to "freebsd-bugs-unsubscribe@freebsd.org" >