uvm panic at boot

["Christoph Egger" <Christoph_Egger%gmx.de@localhost>]

NetBSD/amd64 -current during boot:

panic: kernel diagnostic assertion "lcv != -1" failed: file 
"sys/uvm/uvm_page.c", line 2015

backtrace:
uvm_page_lookup_freelist()
uvm_pglist_add()
uvm_pglistalloc()
_bus_dmamem_alloc_range()
_bus_dmamem_alloc()
usb_block_allocmem()
usb_allocmem()
ehic_alloc_sqh()
ehci_init()
ehci_pci_attach()
config_attach_loc()
pci_probe_device()
pci_enumerate_bus9)
pciresacn()
pciattach()
config_attach_loc()
mp_pci_scan()
mainbus_attach()
config_attach_loc()
cpu_configure()
main()