From owner-freebsd-current  Sun Jun 17  3:23:58 2001
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Date: Sun, 17 Jun 2001 12:12:17 +0200
From: Jens Schweikhardt <schweikh@schweikhardt.net>
To: FreeBSD current <freebsd-current@freebsd.org>
Subject: mdconfig/umount Fatal trap 12
Message-ID: <20010617121217.A2453@schweikhardt.net>
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hello, world\n

with a system cvsupped June 6th I can reliably reproduce a

	Fatal trap 12: page fault while in kernel mode
	fault virtual address   = 0x22
	fault code              = supervisor read, page not present
	instruction pointer     = 0x8:0xc01b67e2
	stack pointer           = 0x10:0xc8f7aea0
	frame pointer           = 0x10:0xc8f7aea8
	code segment            = base 0x0, limit 0xfffff, type 0x1b
							= DPL 0, pres 1, def32 1, gran 1
	processor eflags        = interrupt enabled, resume, IOPL = 0
	current process         = 832 (umount)
	panic: from debugger
	panic: from debugger
	Uptime: 10m3s

	dumping to dev da2s1b, offset 352280

when I try to unmount a deleted mdconfig device. Here's the recipe:

# file iso is a Freebsd 4.3 Wind River CD image made with
# dd if=/dev/cd0c of=file.iso bs=2048

	mdconfig -a -t vnode -f file.iso
	mount -t cd9660 /dev/md0 /mnt/freebsd-cd
	mdconfig -d -u md0
	umount /dev/md0

I'm not sure if this is the right fix but what about having the
mdconfig -d fail with EBUSY in case someone tries to delete a mounted
md device?

Regards,

	Jens
-- 
Jens Schweikhardt http://www.schweikhardt.net/
SIGSIG -- signature too long (core dumped)

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