From owner-freebsd-hackers Sun May 5 17:38: 4 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from ussenterprise.ufp.org (ussenterprise.ufp.org [208.185.30.210]) by hub.freebsd.org (Postfix) with ESMTP id 23B3F37B40A for ; Sun, 5 May 2002 17:38:02 -0700 (PDT) Received: (from bicknell@localhost) by ussenterprise.ufp.org (8.11.1/8.11.1) id g460c1I77601 for freebsd-hackers@FreeBSD.ORG; Sun, 5 May 2002 20:38:01 -0400 (EDT) (envelope-from bicknell) Date: Sun, 5 May 2002 20:38:01 -0400 From: Leo Bicknell To: freebsd-hackers@FreeBSD.ORG Subject: Re: what causes a userland to stop, but allows kernel to continue ? Message-ID: <20020506003801.GA77525@ussenterprise.ufp.org> Mail-Followup-To: freebsd-hackers@FreeBSD.ORG References: <20020505162455.K86733-100000@utility.clubscholarship.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020505162455.K86733-100000@utility.clubscholarship.com> Organization: United Federation of Planets Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In a message written on Sun, May 05, 2002 at 04:31:36PM -0700, Patrick Thomas wrote: > So, based on a previous thread, it looks like I have a server whose > userland halted, essentially, but the kernel continued running. I've seen something similar to this before on an Ultrix box. What happened is on a busy machine the swap disk became unplugged. Remember when all drives were external? Anyway, for the most part things in memory (including logged in users at just a shell prompt) continued to work. New telnet / ssh connections hung right after connect (couldn't load login without touching swap, I think), some httpds worked (enough in memory) others hung waiting for a swap page. The system limped long in this strange state for nearly two minutes until the drive was plugged back in, when it went back to swapping and all was well again. No idea if it is related, but the semi-hung machine isn't a new occurrence. :-) -- Leo Bicknell - bicknell@ufp.org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/ Read TMBG List - tmbg-list-request@tmbg.org, www.tmbg.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message