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From devnull@lkml.org Wed Apr 24 01:07:08 2024 Received: from entropy.muc.muohio.edu (entropy.muc.muohio.edu [134.53.213.10]) by herbie.ucs.indiana.edu (8.8.8/8.8.8) with ESMTP id XAA12957 for ; Wed, 23 Dec 1998 23:54:39 -0500 (EST) Received: from vger.rutgers.edu (vger.rutgers.edu [128.6.190.2]) by entropy.muc.muohio.edu (8.9.0/8.8.7) with ESMTP id XAA09081; Wed, 23 Dec 1998 23:37:29 -0500 Received: by vger.rutgers.edu id <154193-31090>; Wed, 23 Dec 1998 22:25:28 -0500 Received: from orion-fddi.rz.uni-ulm.de ([134.60.240.13]:40048 "HELO orion.rz.uni-ulm.de" ident: "NO-IDENT-SERVICE[2]") by vger.rutgers.edu with SMTP id <154181-31090>; Wed, 23 Dec 1998 22:25:15 -0500 Received: by orion.rz.uni-ulm.de with Smail id m0zt2R3-0003SvC; Thu, 24 Dec 98 05:31 MET Received: from du18oh.wb-net.de(212.202.38.51), claiming to be "extern.uni-ulm.de" via SMTP by orion-fddi.rz.uni-ulm.de, id smtpdAAA0FbScT; Thu Dec 24 05:31:35 1998 Message-Id: <3681C459.402C215E@extern.uni-ulm.de> Date: Thu, 24 Dec 1998 05:34:33 +0100 From: Christoph Hammann Reply-To: chammann@extern.uni-ulm.de X-Mailer: Mozilla 4.5 [en] (X11; I; Linux 2.0.35 i586) X-Accept-Language: en Mime-Version: 1.0 To: linux-kernel@vger.rutgers.edu Cc: Stephen Newey Subject: [Fwd: Eek, a bug & NIS/YP Troubles] Content-Type: multipart/mixed; boundary="------------51B3D5784C68FD619C47D597" X-Orcpt: rfc822;linux-kernel@vger.rutgers.edu Sender: owner-linux-kernel@vger.rutgers.edu Precedence: bulk X-Loop: majordomo@vger.rutgers.edu This is a multi-part message in MIME format. --------------51B3D5784C68FD619C47D597 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi all, I took the liberty to forward this to linux-kernel. Has this bug been looked into? -- __o See you, Christoph Hammann _ \>, chammann@extern.uni-ulm.de ( )/( )____________________________ Economists state their GNP growth projections to the nearest tenth of a percentage point to prove they have a sense of humor. -- Edgar R. Fiedler --------------51B3D5784C68FD619C47D597 Content-Type: message/rfc822 Content-Transfer-Encoding: 7bit Content-Disposition: inline From owner-linux-newbie-outgoing@vger.rutgers.edu Thu Dec 24 02:31:36 1998 Return-Path: Received: by orion.rz.uni-ulm.de with Smail id m0zszcm-0003T4a; Thu, 24 Dec 98 02:31 MET Received: from ferret.lmh.ox.ac.uk(163.1.138.204) via SMTP by orion-fddi.rz.uni-ulm.de, id smtpdAAARfpb8_; Thu Dec 24 02:31:26 1998 Received: (qmail 9907 invoked from network); 24 Dec 1998 01:31:25 -0000 Received: from vger.rutgers.edu (128.6.190.2) by ferret.lmh.ox.ac.uk with SMTP; 24 Dec 1998 01:31:25 -0000 Received: by vger.rutgers.edu id <154149-31090>; Wed, 23 Dec 1998 19:19:55 -0500 Received: from mail5.svr.pol.co.uk ([195.92.193.20]:27280 "EHLO mail5.svr.pol.co.uk" ident: "NO-IDENT-SERVICE[2]") by vger.rutgers.edu with ESMTP id <154124-31090>; Wed, 23 Dec 1998 19:19:27 -0500 Received: from modem-51.iodine.dialup.pol.co.uk ([62.136.26.51] helo=nexus.cablenet.co.uk) by mail5.svr.pol.co.uk with esmtp (Exim 2.10 #1) id 0zszZx-0007vK-00 for linux-newbie@vger.rutgers.edu; Thu, 24 Dec 1998 01:28:41 +0000 Received: from localhost (elists@localhost) by nexus.cablenet.co.uk (8.8.8/8.8.8) with SMTP id BAA00767 for ; Thu, 24 Dec 1998 01:26:07 GMT Date: Thu, 24 Dec 1998 01:26:06 +0000 (GMT) From: Stephen Newey To: linux-newbie@vger.rutgers.edu Subject: Eek, a bug & NIS/YP Troubles Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Orcpt: rfc822;linux-newbie@vger.rutgers.edu Sender: owner-linux-newbie@vger.rutgers.edu Precedence: bulk X-Loop: majordomo@vger.rutgers.edu X-Mozilla-Status2: 00000000 Hi everyone, While reading through the list I got interested on the subject of being able (or not) to move a program to a different TTY. So I started experimenting. I ran "man", I can't remember on which manpages now, and then I did Ctrl+Z to freeze the process. I then logged out. I logged back in and did a "jobs" to see if it was still there, and it wasn't. "Never mind" I thought, and got on with something else. Then I started to notice my HDD going fairly regularly. "Eek", I thought, "what's going on?". So I ran "top" to see what was happening. To my surprise "man" was still running, using around 15% CPU time, and continually absorbing memory at a rate of around 256K/sec. "Strange..." I thought, and exited "top", waited for a while (swapping had kicked in bad by this time), and I ran "kill" on the process, ps'd and the process was still there. I tried logging in at a different console, and it locked, with HDD on constantly. I could enter a command on the already logged on console but it didn't execute it, just locked. Suddenly the HDD stopped...."ooh", I thought, "it must have died", so I tried logging in both locally and remotely, still locked. And after a few more secs the HDD kicked in again. "Nooo!" I thought, "I'll have to reset without shutting down", (Ctrl+Alt+Del had no effect) though my confidence of course was much greater in Linux than it would be if I had to do the same in Winslozes. And everything rebooted fine. Checked the /var/log/messages, and it had reported the following: nexus: kernel: swap_in: nexus: Out of memory for mingetty (I guess one of my login attempts) nexus: Unable to load interpreter (" " " " " " " ) "Well," I thought, "that's a reasonable response". Anyway, that happened as the root user. "So," I pondered, "let's find out if this was a one off". So, I fired up my other machine into Linux (systems explained below), thinking as it isn't using swap memory it won't be so painful. Anyway, I logged in as a normal user. Ran "man" on a different page, did Ctrl+Z, logged out (this time I got a message saying that a process was still running, tried logout again and it let me), logged back in, ps'd and "man" was still there, I brought up "top", and again around 15% CPU and slowly increasing memory usage. Anyway, did a "man" on kill, and worked out to do "kill -s 9 pid", which put it to rest and released the resources. So, what's the point of this random ramblings? Well, I thought it'd be an easy way to crash a server if all a user had to do is log in, start a process, halt it, and log out. By the time it is discovered, it'd probably be too late. Not so much a security risk, but a big nuisence. Perhaps this has already been resolved, or is only specific to me (though on two different systems?). OK, my setup is this.... Cyrix M-II 300 32Mb RAM as my Linux Server (where I discovered the problem) AMD K6-2 300MHz 128Mb as my Win98 (working on removing it)/Linux Workstation, remote booting via nfs-root and loadlin from the above mentioned server. Both using SuSE Linux 5.2, Kernel 2.0.34. This brings me to my next problem (if anyone is reading this far down). I've setup NIS/YP server on my Server machine, which seems fine. I've set the workstation up to use YP client. Config seems OK, but when I log in on the client with one of the servers username, it don't like it, "login incorrect". So I run ypserv on the server in debug mode to see what's happening. Attempt another login, the server validates the user, bring up name and everything on the server's display, but again "login incorrect" on the client. Any ideas? Let me know if you want anymore details. (home directories are being pulled off the server onto the clients /home by NFS, to maintain them across both machines). I've been using Linux for a while now, and love it a bit more everyday. I installed NT Server on a system the other day, just to revisit it (having used it some time ago), and I couldn't believe how bad it was as server (let alone anything else). After getting used to Linux it just seemed really unflexible and lacking. (Sorry, I had to tell someone)! Thanks for any assistance any of you may offer, Stephen Newey. --------------51B3D5784C68FD619C47D597-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/