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From: "Karel Kulhavý" <clock@twibright.com>
To: linux-kernel@vger.kernel.org
Subject: cat /dev/hdb > /dev/null DoS
Date: Thu, 8 Apr 2004 08:55:18 +0000	[thread overview]
Message-ID: <20040408085518.B4607@beton.cybernet.src> (raw)

Hello

I have 2.8 GHz Pentium IV with 1GB RAM and 250GB ATA-133 IDE disk
on /dev/hdb.

I did cat /dev/hdb > /dev/null and after a while (5 minutes),
the system went totally unresponsive:

1) man top takes 3 minutes to display man page
2) Switching between console and X takes also a couple of minutes
3) top shows this:

Cpu(s):  1.4% us,  1.4% sy,  0.0% ni,  0.0% id,  0.0% wa, 97.3% hi,  0.0% si

/dev/hdb is auxilliary disk that is not used, is not mounted and the
root filesystem doesn't reside on it (of course). Kernel version is 2.6.3.

Is this behaviour normal?

Cl<

             reply	other threads:[~2004-04-08  8:55 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-04-08  8:55 Karel Kulhavý [this message]
2004-04-08 10:36 ` cat /dev/hdb > /dev/null DoS Sven Köhler
2004-04-09  0:10   ` Sven Köhler
2004-04-09  6:47     ` Denis Vlasenko

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