Hello. I just upgraded a FreeBSD 6.0 system to
6.1-prerelease and now mount_nullfs seems to be broken. I
get the error "mount_nullfs: Operation not supported by
device". Nothing has changed in the hardware or the config
files. Here is the output dmesg:

Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991,
1992, 1993, 1994
        The Regents of the University of California. All
rights reserved.
FreeBSD 6.1-PRERELEASE #0: Thu Mar 23 14:53:13 CST 2006
    [EMAIL PROTECTED]:/usr/obj/usr/src/sys/GENERIC
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) 64 X2 Processor 3800+ (2010.31-MHz
K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x20fb1  Stepping = 1
real memory  = 1073676288 (1023 MB)
avail memory = 1025048576 (977 MB)
ioapic0: Changing APIC ID to 4
ioapic0 <Version 1.1> irqs 0-23 on motherboard
acpi0: <Nvidia AWRDACPI> on motherboard
acpi_bus_number: can't get _ADR
acpi_bus_number: can't get _ADR
acpi0: Power Button (fixed)
acpi_bus_number: can't get _ADR
acpi_bus_number: can't get _ADR
acpi_bus_number: can't get _ADR
acpi_bus_number: can't get _ADR
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port
0x4008-0x400b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pci0: <memory> at device 0.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
pci0: <serial bus, SMBus> at device 1.1 (no driver attached)
ohci0: <OHCI (generic) USB controller> mem
0xfebff000-0xfebfffff irq 21 at device 2.0 on pci0
usb0: OHCI version 1.0, legacy support
usb0: <OHCI (generic) USB controller> on ohci0
usb0: USB revision 1.0
uhub0: nVidia OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 10 ports with 10 removable, self powered
ehci0: <NVIDIA nForce4 USB 2.0 controller> mem
0xfebfe000-0xfebfe0ff irq 22 at device 2.1 on pci0
usb1: EHCI version 1.0 usb1: companion controller, 4 ports
each: usb0 usb1: <NVIDIA nForce4 USB 2.0 controller> on
usb1: USB revision 2.0
uhub1: nVidia EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub1: 10 ports with 10 removable, self powered
pci0: <multimedia, audio> at device 4.0 (no driver attached)
atapci0: <nVidia nForce CK804 UDMA133 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xe000-0xe00f at
device 6.0 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
atapci1: <nVidia nForce CK804 SATA300 controller> port
mem 0xfebfb000-0xfebfbfff irq 21 at device 7.0 on pci0
ata2: <ATA channel 0> on atapci1
ata3: <ATA channel 1> on atapci1
atapci2: <nVidia nForce CK804 SATA300 controller> port
mem 0xfebfa000-0xfebfafff irq 22 at device 8.0 on pci0
ata4: <ATA channel 0> on atapci2
ata5: <ATA channel 1> on atapci2
pcib1: <ACPI PCI-PCI bridge> at device 9.0 on pci0
pci1: <ACPI PCI bus> on pcib1
fwohci0: <VIA Fire II (VT6306)> port 0xac00-0xac7f mem
0xfbfff000-0xfbfff7ff irq 16 at device 6.0 on pci1
fwohci0: OHCI version 1.10 (ROM=1)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:01:29:20:00:03:4d:81
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 02:01:29:03:4d:81
fwe0: Ethernet address: 02:01:29:03:4d:81
fwe0: if_start running deferred for Giant
sbp0: <SBP-2/SCSI over FireWire> on firewire0
fwohci0: Initiate bus reset
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
firewire0: bus manager 0 (me)
pci1: <display, VGA> at device 9.0 (no driver attached)
nve0: <NVIDIA nForce MCP9 Networking Adapter> port
0xb400-0xb407 mem 0xfebf9000-0xfebf9fff irq 23 at device
10.0 on pci0
nve0: Ethernet address 00:01:29:d2:25:69
miibus0: <MII bus> on nve0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX,
1000baseT, 1000baseT-FDX, auto
nve0: Ethernet address: 00:01:29:d2:25:69
pcib2: <ACPI PCI-PCI bridge> at device 11.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> at device 12.0 on pci0
pci3: <ACPI PCI bus> on pcib3
pcib4: <ACPI PCI-PCI bridge> at device 13.0 on pci0
pci4: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 14.0 on pci0
pci5: <ACPI PCI bus> on pcib5
acpi_tz0: <Thermal Zone> on acpi0
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq
6 drq 2 on acpi0
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4
flags 0x10 on acpi0
sio0: type 16550A
sio1: <Generic IRDA-compatible device> port 0x2f8-0x2ff
irq 3 on acpi0
sio1: type 16550A
ppc0: <Standard parallel printer port> port 0x378-0x37f
irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq
1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse Explorer, device ID 4
orm0: <ISA Option ROMs> at iomem
0xc0000-0xc7fff,0xc8000-0xc97ff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem
0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 2010312401 Hz quality 800
Timecounters tick every 1.000 msec
module_register_init: MOD_LOAD (amr_linux,
0xffffffff805f1c70, 0) error 6
acd0: DMA limited to UDMA33, device found non-ATA66 cable
acd0: DVDR <LITE-ON DVDRW SHM-165H6S/HS02> at ata0-master
ad6: 238475MB <WDC WD2500JS-55MHB0 02.01C03> at
ata3-master SATA300
Trying to mount root from ufs:/dev/ad6s1a

I am using the ezjail package to test jails on this system
and with 6.0 everything worked as advertised. Any ideas?

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