xen-4.5 on NetBSD/amd64-6.1.5

[david l goodrich <dlg%dsrw.org@localhost>]

I just tried upgrading from xen 4.2 to 4.5, but my NetBSD domUs
won't boot.  I am not having any luck tracking down a reason,
does anyone have any pointers?

Thanks,
david

monolith# xl create /usr/pkg/etc/xen/router
Parsing config from /usr/pkg/etc/xen/router
libxl: error: libxl_create.c:1153:domcreate_launch_dm: unable to
add disk devices
libxl: error: libxl_device.c:797:libxl__initiate_device_remove:
unable to get my domid
libxl: error: libxl.c:1640:devices_destroy_cb:
libxl__devices_destroy failed for 7
monolith# cat /usr/pkg/etc/xen/router
name   = "router"

#kernel = "/xen/kernel/NetBSD/6.1.5/amd64/netbsd-XEN3_DOMU-pf.gz"
kernel =
"/xen/kernel/NetBSD/6.1.5/amd64/netbsd-XEN3_DOMU-pf-SA2015-004.gz"

memory = 128
disk   = [ 'phy:/dev/mapper/small-vm.router,0x01,w' ]
root   = "xbd0a"
vif    = [ 'mac=00:16:3e:0a:9d:4f,bridge=bridge0',
           'mac=00:16:3e:08:6d:b7,bridge=bridge1',
           'bridge=bridge2'
         ]
monolith#