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 
        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?


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

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