Re: How a normal user can crash any linux system (fwd)

From: Jim Bryant (jbryant@ppp-207-193-186-239.kscymo.swbell.net)
Date: Wed Mar 22 2000 - 16:55:17 EST

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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!

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Next message: Andre Hedrick: "Re: [2.3.99pre2] [CORRUPTION] Doh! Corruption problems again..."
Previous message: Saxena, Deepak: "io_request_lock and system performance (can it be replaced?)"
In reply to: Alfred Perlstein: "Re: How a normal user can crash any linux system (fwd)"
Next in thread: Alfred Perlstein: "Re: How a normal user can crash any linux system (fwd)"
Reply: Alfred Perlstein: "Re: How a normal user can crash any linux system (fwd)"
Reply: Matthew Dillon: "Re: How a normal user can crash any linux system (fwd)"
Reply: Dan Hollis: "Re: How a normal user can crash any linux system (fwd)"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Thu Mar 23 2000 - 21:00:37 EST