kern/41786: mount -t fdesc FAIL!

[bad%bsd.de@localhost]

>Number:         41786
>Category:       kern
>Synopsis:       trying to mount an fdesc file system causes a kernel page 
>fault.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 26 18:15:04 +0000 2009
>Originator:     Christoph Badura
>Release:        NetBSD 5.99.15 "AKW Kruemel" as of 2009-07-26
>Organization:
netbsd bozotic software test labs
        
>Environment:
        
        
System: NetBSD not-invented-here 5.99.15 NetBSD 5.99.15 (XEN2_DOMU) #0: Sun Jul 
26 17:15:20 CEST 2009 
bad@just-passing-through:/mnt/src/sys/arch/i386/compile/obj/XEN2_DOMU i386
Architecture: i386
Machine: i386
>Description:
        
just-passing-through!bad 181 % xm create -c nih3 extra=-s
Using config file "/etc/xen/nih3".
Started domain nih, console on port 9606
************ REMOTE CONSOLE: CTRL-] TO QUIT ********
Loaded initial symtab at 0xc04dca20, strtab at 0xc0513154, # entries 12993
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 5.99.15 (XEN2_DOMU) #0: Sun Jul 26 17:15:20 CEST 2009
        bad@just-passing-through:/mnt/src/sys/arch/i386/compile/obj/XEN2_DOMU
total memory = 256 MB
avail memory = 246 MB
mainbus0 (root)
cpu0 at mainbus0: Intel 686-class, 860MHz, id 0x686
hypervisor0 at mainbus0
xencons0 at hypervisor0: Xen Virtual Console Driver
Initialising Xen virtual ethernet frontend driver.
npx0 at hypervisor0: using exception 16
xennet0 at hypervisor0: Xen Virtual Network Interface
xennet1 at hypervisor0: Xen Virtual Network Interface
xennet0: MAC address aa:00:59:d9:5d:fb
xennet1: MAC address aa:11:59:d9:5d:fb
xbd0 at hypervisor0: Xen Virtual Block Device 512 MB
xbd1 at hypervisor0: Xen Virtual Block Device 512 MB
xbd2 at hypervisor0: Xen Virtual Block Device 1536 MB
xbd3 at hypervisor0: Xen Virtual Block Device 1792 MB
xbd4 at hypervisor0: Xen Virtual Block Device 1280 MB
Kernelized RAIDframe activated
boot device: xbd0
root on xbd0a dumps on xbd0b
mountroot: trying smbfs...
mountroot: trying ntfs...
mountroot: trying nfs...
mountroot: trying msdos...
mountroot: trying lfs...
mountroot: trying ext2fs...
mountroot: trying ffs...
root file system type: ffs
warning: no /dev/console
init: copying out flags `-s' 3
init: copying out path `/sbin/init' 11
Created tmpfs /dev (1376256 byte, 2656 inodes)
Enter pathname of shell or RETURN for /bin/sh:
Terminal type is vt100.
We recommend that you create a non-root account and use su(1) for root access.
# mount -t fdesc fdesc /mnt
uvm_fault(0xc9d5cb98, 0, 1) -> 0xe
fatal page fault in supervisor mode
trap type 6 code 0 eip c01509f2 cs 9 eflags 10212 cr2 0 ilevel 0
kernel: supervisor trap page fault, code=0
Stopped in pid 79.1 (mount_fdesc) at    netbsd:fdesc_statvfs+0x62:      cmpl    
$
0x1,0x8(%eax)
db> bt
fdesc_statvfs(ccc7600c,ccc76050,0,ccbd6cd0,0,0,0,bfbfe728,0,ccbd6c14) at netbsd:
fdesc_statvfs+0x62
do_sys_mount(c9d562c0,0,8048be2,bfbfe728,0,0,0,0,ccbd6d28,0) at netbsd:do_sys_mo
unt+0x8ed
sys___mount50(c9d562c0,ccbd6d00,ccbd6d28,c9d5cb98,c9d5cb98,c9d57594,19a,8048be2,
bfbfe728,0) at netbsd:sys___mount50+0x49
syscall(ccbd6d48,1f,1f,1f,1f,bfbfe728,bfbfebbc,bfbfeb38,bfbffc7a,3fc) at netbsd:
syscall+0xce
db> reboot 808
syncing disks... done

>How-To-Repeat:
        
mount -t fdesc fdesc /mnt

>Fix:
        
unknown.

>Unformatted: