'repeat make_dev' panic while booting

I get 100% panics while booting since at least 2 days ago.

Copyright (c) 1992-2003 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 5.1-BETA #22: Thu May  8 19:02:10 JST 2003
    shinra_at_e-note:/usr/obj/usr/freebsd/src/sys/LOCAL
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0500000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc05001f4.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc0500244.
Preloaded elf module "/boot/kernel/snd_via82c686.ko" at 0xc05002f0.
Preloaded elf module "/boot/kernel/apm.ko" at 0xc05003a4.
Timecounter "i8254"  frequency 1193182 Hz
CPU: Intel Pentium III (996.31-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x686  Stepping = 6
  Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
real memory  = 125763584 (119 MB)
avail memory = 116793344 (111 MB)
Pentium Pro MTRR support enabled
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcibios: BIOS version 2.10
Using $PIR table, 5 entries at 0xc00fdf70
apm0: <APM BIOS> on motherboard
apm0: found APM BIOS v1.2, connected at v1.2
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
agp0: <VIA Generic host to PCI bridge> mem 0xf8000000-0xfbffffff at device 0.0 on pci0
pcib1: <PCIBIOS PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
pci0: <simple comms> at device 6.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686A UDMA66 controller> port 0x1000-0x100f at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <VIA 83C572 USB controller> port 0x1020-0x103f irq 5 at device 7.2 on pci0
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhub0: port error, restarting port 1
uhub0: port error, giving up port 1
uhub0: port error, restarting port 2
uhub0: port error, giving up port 2
isab1: <PCI-ISA bridge> at device 7.4 on pci0
pcm0: <VIA VT82C686A> port 0x1018-0x101b,0x101c-0x101f,0x1800-0x18ff at device 7.5 on pci0
pci_cfgintr: 0:7 INTC routed to irq 5
pcm0: <Wolfson WM9703/4/7/8 AC97 Codec>
pcic0: <TI PCI-1225 PCI-CardBus Bridge> irq 10 at device 10.0 on pci0
pcic0: PCI Memory allocated: 0x88000000
pcic0: Polling mode
pcic0: TI12XX PCI Config Reg: [speaker enable][pwr save][CSC serial isa irq]
pccard0: <PC Card 16-bit bus (classic)> on pcic0
pcic1: <TI PCI-1225 PCI-CardBus Bridge> irq 10 at device 10.1 on pci0
pcic1: PCI Memory allocated: 0x88001000
pcic1: Polling mode
pcic1: TI12XX PCI Config Reg: [speaker enable][pwr save][CSC serial isa irq]
pccard1: <PC Card 16-bit bus (classic)> on pcic1
pmtimer0 on isa0
orm0: <Option ROMs> at iomem 0xdc000-0xdffff,0xc0000-0xcbfff on isa0
vt0: <pcvt VT220 console driver> at port 0x3b0-0x3df iomem 0-0x7fff on isa0
vt0: unknown trident VGA, 80 columns, color, 8 screens, MF2-keyboard
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model GlidePoint, device ID 0
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> at port 0x3f7,0x3f0-0x3f5 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (EPP/NIBBLE) 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
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x100>
WARNING: Driver mistake: repeat make_dev("ttyv0")
panic: don't do that
Debugger("panic")
Stopped at      Debugger+0x54:  xchgl   %ebx,in_Debugger.0
db> tr
Debugger(c0389d7b,c03f85e0,c0387339,c0522c78,1) at Debugger+0x54
panic(c0387339,c03f4a00,c0522cb0,5,ffffffff) at panic+0xab
make_dev(c03dcde0,0,0,0,180) at make_dev+0x19c
sc_attach_unit(0,100,c173d098,c1759800,c0522cfc) at sc_attach_unit+0x2aa
scattach(c1759800,c173d098,c03aa67c,c1759800,c0b52980) at scattach+0x2d
DEVICE_ATTACH(c1759800,c1759800,800,c17aa000,1) at DEVICE_ATTACH+0x48
device_probe_and_attach(c1759800,c03c3f20,0,c02053a2,c0b51a80) at device_probe_and_attach+0x7d
isa_probe_children(c0b52980,c03a118a,0,c0522d98,c01ca015) at isa_probe_children+0x11c
configure(0,51f000,51fc00,51f000,0) at configure+0x4b
mi_startup() at mi_startup+0xb5
begin() at begin+0x2c
db> reset