Date: Thu, 24 Feb 2005 14:28:52 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Dental-on-line <info@dental-on-line.fr> Cc: freebsd-bugs@freebsd.org Subject: Re: ssh sbwait indfinite timeout on SMP machines Message-ID: <Pine.NEB.3.96L.1050224142728.16921A-100000@fledge.watson.org> In-Reply-To: <421DAE3F.8030103@dental-on-line.fr>
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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" >
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