From owner-freebsd-stable  Thu Nov 15 14:22:32 2001
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Date: Thu, 15 Nov 2001 15:22:26 -0700
From: "Kenneth D. Merry" <ken@kdm.org>
To: Dirk Froemberg <dirk@FreeBSD.ORG>
Cc: stable@FreeBSD.ORG, phk@FreeBSD.ORG
Subject: Re: kernel panic if using SCSI CDROM as root device
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References: <20011115003027.A87962@physik.TU-Berlin.DE> <20011115120432.A18404@physik.TU-Berlin.DE> <20011115145615.A34719@panzer.kdm.org> <20011115231115.B84012@physik.TU-Berlin.DE>
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In-Reply-To: <20011115231115.B84012@physik.TU-Berlin.DE>; from dirk@FreeBSD.ORG on Thu, Nov 15, 2001 at 11:11:16PM +0100
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On Thu, Nov 15, 2001 at 23:11:16 +0100, Dirk Froemberg wrote:
> Hi Kenneth!
> 
> On Thu, Nov 15, 2001 at 02:56:15PM -0700, Kenneth D. Merry wrote:
> > [...]
> > Can you find out what line of code in dsioctl is causing the problem?
> > 
> > If you built a debug kernel, you can do the following:
> > 
> > gdb -k kernel.debug
> > list *(dsioctl+0x42)
> > 
> > That should indicate which line in dsioctl is blowing up.
> 
> Yes, of course:
> 
> % gdb -k kernel.debug
> GNU gdb 4.18
> [...]
> (kgdb) list *(dsioctl+0x42)
> 0xc01b5216 is in dsioctl (/usr/src/sys/kern/subr_diskslice.c:357).
> 352		struct partition *pp;
> 353	
> 354		slice = dkslice(dev);
> 355		ssp = *sspp;
> 356		sp = &ssp->dss_slices[slice];
> 357		lp = sp->ds_label;
> 358		switch (cmd) {
> 359	
> 360		case DIOCGDVIRGIN:
> 361			lp = (struct disklabel *)data;
> (kgdb) 
> 
> 	Regards Dirk

Thanks!

Poul-Henning, any idea why this might be blowing up?  It looks like the
slice pointer isn't initialized for some reason.

Ken
-- 
Kenneth Merry
ken@kdm.org

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