Date: Wed, 22 Mar 2000 15:55:17 -0600 (CST) From: Jim Bryant <jbryant@ppp-207-193-186-239.kscymo.swbell.net> To: bright@wintelcom.net (Alfred Perlstein) Cc: rminnich@lanl.gov, hackers@FreeBSD.ORG, linux-kernel@vger.rutgers.edu, Michael.Lampe@iwr.uni-heidelberg.de Subject: Re: How a normal user can crash any linux system (fwd) Message-ID: <200003222155.PAA35282@ppp-207-193-186-239.kscymo.swbell.net> In-Reply-To: <20000322102407.K7305@fw.wintelcom.net>
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In reply: > This is cross-posted to both linux-kernel and freebsd-hackers, please > set your replies properly. > > > I found the following by accident playing with PVM. If you start the > > 'gexample' from the examples directory with dimension=10000 and no of > > tasks=32 on one machine, it becomes almost immediately completely un- > > usable and begins with heavy swapping. Considering how much memory > > would be necessary for this computation before starting it would have > > avoided the trouble. well, there are other ways to make a system slow to a crawl.... a good preventative measure is to never give shell accounts unless everyone is accountable. #!/bin/csh /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& /usr/games/primes 1 4294967295 >&/dev/null& # etc, ... # # [get the idea?] jim -- All opinions expressed are mine, if you | "I will not be pushed, stamped, think otherwise, then go jump into turbid | briefed, debriefed, indexed, or radioactive waters and yell WAHOO !!! | numbered!" - #1, "The Prisoner" ------------------------------------------------------------------------------ kc5vdj@swbell.net KC5VDJ - HF to 23cm KC5VDJ@NW0I.#NEKS.KS.USA.NOAM HF/VHF: IC-706MkII VHF/UHF/SHF: IC-T81A KPC3+ & PK-232MBX Grid: EM28px ------------------------------------------------------------------------------ ET has one helluva sense of humor, always anal-probing right-wing schizos! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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