From owner-freebsd-hackers  Wed Jun 19 11:55:41 2002
Delivered-To: freebsd-hackers@freebsd.org
Received: from salmon.maths.tcd.ie (salmon.maths.tcd.ie [134.226.81.11])
	by hub.freebsd.org (Postfix) with SMTP id 7FFAD37B405
	for <freebsd-hackers@FreeBSD.ORG>; Wed, 19 Jun 2002 11:55:35 -0700 (PDT)
Received: from walton.maths.tcd.ie by salmon.maths.tcd.ie with SMTP
          id <aa29511@salmon>; 19 Jun 2002 19:55:31 +0100 (BST)
To: Andy Sporner <sporner@nentec.de>
Cc: freebsd-hackers <freebsd-hackers@FreeBSD.ORG>
Subject: Re: Kernel Panic using kproc_exit() on FreeBSD 5.0-20020302-PREVIEW 
In-Reply-To: Your message of "Mon, 17 Jun 2002 11:47:13 +0200."
             <3D0DB021.4080102@nentec.de> 
Date: Wed, 19 Jun 2002 19:55:30 +0100
From: Ian Dowse <iedowse@maths.tcd.ie>
Message-ID:  <200206191955.aa29511@salmon.maths.tcd.ie>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

In message <3D0DB021.4080102@nentec.de>, Andy Sporner writes:
>SYSINIT(modtcpd, SI_SUB_KTHREAD_BUF, SI_ORDER_FIRST, kproc_start, &kp)
>static void modtcpd(void)
>{
>                tsleep(0x0dead0001, 0, "General Wait", 400);
>                kthread_exit(0);
>}
...
>panic: mutex Giant not owned at ../../../kern/kern_exit.c"131

If you haven't guessed already by looking at other kernel threads,
you need to "mtx_lock(&Giant);" before calling kthread_exit(). Most
kthreads acquire Giant at the start and hold it throughout their
execution (it it implicitly dropped when the thread is sleeping).
You should do this too unless you are sure that all operations that
the thread is performing are safe to do without Giant.

Ian

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message