linux-kernel - Killing a kernel thread from user space ?

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Message-ID: <5f695cd0902011059g518cc6d4of00b8e1e00fe67c5@mail.gmail.com>
Date:	Sun, 1 Feb 2009 10:59:44 -0800
From:	George Kumar <grgkumar4@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Killing a kernel thread from user space ?

Hi,

Is it possible to kill a kernel thread from user space. Don't ask me
why do I need to do this. This is purely an experimental exercise, I
am not doing it because I am working on a practical problem. Thing is
that I wrote a kernel module and now it is hung in a kernel thread
somewhere doing udelay(), fortunately since I am on preemptible kernel
 my machine is not frozen,
but still I saw that doing a kill -9 on this process has no effect.
How about if I insert another kernel module and kill this busywait
thread from inside the kernel space. In effect how do you execute
"kill -9" from one kernel thread to misbehaving kernel thread.

thanks.
george
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