Just found very hursh behaviour [for me] of umass on 2.0:

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umass0 at uhub4 port 1 configuration 1 interface 0
umass0: USB Flash Disk, rev 2.00/2.00, addr 5
umass0: using SCSI over Bulk-Only
umass0: no buffer memory
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On the same machine all was fine with 1.6.1 and 1.6.2.

AFAIR someone has reported simular failures with USB on 2.0. Any 
ideas/workarounds ?

dmesg

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NetBSD 2.0_BETA (IANZAG) #1: Fri Apr 30 16:52:38 NOVST 2004
        toor@NBSD1:/sys/arch/i386/compile/IANZAG
total memory = 255 MB
avail memory = 247 MB
BIOS32 rev. 0 found at 0xfa0e0
mainbus0 (root)
cpu0 at mainbus0: (uniprocessor)
cpu0: Intel Celeron (686-class), 1818.10 MHz, id 0xf13
cpu0: features 3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features 3febfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu0: features 3febfbff<FXSR,SSE,SSE2,SS,HTT,TM>
cpu0: I-cache 12K uOp cache 8-way, D-cache 8 KB 64b/line 4-way
cpu0: ITLB 4K/4M: 64 entries
cpu0: DTLB 4K/4M: 64 entries
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82845 Host (rev. 0x11)
agp0 at pchb0: aperture at 0xd0000000, size 0x8000000
ppb0 at pci0 dev 1 function 0: Intel 82845 AGP (rev. 0x11)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vga0 at pci1 dev 0 function 0: Nvidia Corporation GeForce4 MX 440 (rev. 0xa3)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0
uhci0 at pci0 dev 29 function 0: Intel 82801DB/DBM USB UHCI Controller #1 
(rev. 0x01)
uhci0: interrupting at irq 12
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1 at pci0 dev 29 function 1: Intel 82801DB/DBM USB UHCI Controller #2 
(rev. 0x01)
uhci1: interrupting at irq 6
usb1 at uhci1: USB revision 1.0
uhub1 at usb1
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2 at pci0 dev 29 function 2: Intel 82801DB/DBM USB UHCI Controller #3 
(rev. 0x01)
uhci2: interrupting at irq 9
usb2 at uhci2: USB revision 1.0
uhub2 at usb2
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0 at pci0 dev 29 function 7: Intel 82801DB/DBM USB EHCI Controller (rev. 
0x01)
ehci0: interrupting at irq 7
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: uhci0 uhci1 uhci2
usb3 at ehci0: USB revision 2.0
uhub3 at usb3
uhub3: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub3: 6 ports with 6 removable, self powered
ppb1 at pci0 dev 30 function 0: Intel 82801BA Hub-to-PCI Bridge (rev. 0x81)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled
rtk0 at pci2 dev 9 function 0: Realtek 8139 10/100BaseTX
rtk0: interrupting at irq 11
rtk0: Ethernet address 00:20:ed:42:63:05
ukphy0 at rtk0 phy 7: Generic IEEE 802.3u media interface
ukphy0: OUI 0x000000, model 0x0000, rev. 0
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
ichlpcib0 at pci0 dev 31 function 0
ichlpcib0: Intel 82801DB LPC Interface Bridge (rev. 0x01)
ichlpcib0: TCO (watchdog) timer configured.
piixide0 at pci0 dev 31 function 1
piixide0: Intel 82801DB IDE Controller (ICH4) (rev. 0x01)
piixide0: bus-master DMA support present
piixide0: primary channel wired to compatibility mode
piixide0: primary channel interrupting at irq 14
atabus0 at piixide0 channel 0
piixide0: secondary channel wired to compatibility mode
piixide0: secondary channel interrupting at irq 15
atabus1 at piixide0 channel 1
Intel 82801DB/DBM SMBus Controller (SMBus serial bus, revision 0x01) at pci0 
dev 31 function 3 not configured
auich0 at pci0 dev 31 function 5: i82801DB/DBM (ICH4/ICH4M) AC-97 Audio
auich0: interrupting at irq 5
auich0: ac97: Avance Logic ALC650 codec; 20 bit DAC, 18 bit ADC, Realtek 3D
auich0: ac97: ext id 7c7<AC97_22,AMAP,LDAC,SDAC,CDAC,SPDIF,DRA,VRA>
isa0 at ichlpcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
sysbeep0 at pcppi0
npx0 at isa0 port 0xf0-0xff: using exception 16
apm0 at mainbus0: Power Management spec V1.2
auich0: measured ac97 link rate at 48011 Hz, will use 48000 Hz
audio0 at auich0: full duplex, mmap, independent
wd0 at atabus0 drive 0: <IC35L060AVER07-0>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 58644 MB, 119150 cyl, 16 head, 63 sec, 512 bytes/sect x 120103200 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd1 at atabus0 drive 1: <Maxtor 2B010H1>
wd1: drive supports 16-sector PIO transfers, LBA addressing
wd1: 9771 MB, 19854 cyl, 16 head, 63 sec, 512 bytes/sect x 20012832 sectors
wd1: 32-bit data port
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA 
data transfers)
wd1(piixide0:0:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA 
data transfers)
atapibus0 at atabus1: 2 targets
cd0 at atapibus0 drive 1: <ASUS CD-S500/A, , V1.4D> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(piixide0:1:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA 
data transfers)
boot device: wd1
root on wd1a dumps on wd1b
uhub4 at uhub0 port 1
uhub4: Chuntex Ex1300 hub, class 9/1, rev 1.00/0.01, addr 2
uhub4: 5 ports with 4 removable, self powered
uhidev0 at uhub4 port 2 configuration 1 interface 0
uhidev0: Logitech USB Mouse, rev 1.10/6.20, addr 3, iclass 3/1
ums0 at uhidev0: 3 buttons and Z dir.
wsmouse0 at ums0 mux 0
uhidev1 at uhub4 port 4 configuration 1 interface 0
uhidev1: Chuntex product 0x1786, rev 1.00/0.01, addr 4, iclass 3/0
uhidev1: 34 report ids
uhid0 at uhidev1 reportid 1: input=0, output=0, feature=128
uhid1 at uhidev1 reportid 2: input=0, output=0, feature=2
uhid2 at uhidev1 reportid 3: input=2, output=0, feature=2
uhid3 at uhidev1 reportid 5: input=0, output=0, feature=1
uhid4 at uhidev1 reportid 6: input=3, output=0, feature=3
uhid5 at uhidev1 reportid 7: input=1, output=0, feature=1
uhid6 at uhidev1 reportid 8: input=6, output=0, feature=6
uhid7 at uhidev1 reportid 9: input=3, output=0, feature=3
uhid8 at uhidev1 reportid 10: input=3, output=0, feature=3
uhid9 at uhidev1 reportid 12: input=5, output=0, feature=5
uhid10 at uhidev1 reportid 32: input=0, output=0, feature=1
uhid11 at uhidev1 reportid 33: input=0, output=0, feature=4
uhid12 at uhidev1 reportid 34: input=0, output=0, feature=1
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
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// wbr