DOMU problem with vif

[Phil Nelson <phil%NetBSD.org@localhost>]

Hello,

    I've finally had time to start using xen ... and have been setting
up a set of 4 machines with xen.   I'm using NetBSD/amd64, 6.1.5
as DOM0 and using xen 4.1.   On three of the 4 machines, I have
successfully set up a couple of DOMU domains.   Using an identical
setup (except MAC address) I've been having problems getting
the 4th machine to run any DOMU domains.     It continues to return
the error:

Error: Device 0 (vif) could not be connected. Hotplug scripts not working.

I have a bridge created the same way as on the three working machines.

I have no clue where to go from here.   The machine has two real
ethernet ports and have tried both of them with identical results.

I have finally checked the dmesg of all the DOM0 kernels and have 
found that the three working ones are essentially identical, but there
the non-working one has some more interesting differences.   Following
is a unified diff from a working kernel and the non-working.  I'm
wondering if there is anything here that could explain why I can't
start a DOMU on the mc2 machine.

--- mc0.dmesg	2015-01-28 23:41:11.000000000 -0800
+++ mc2.dmesg	2015-01-28 23:41:33.000000000 -0800
@@ -12,16 +12,16 @@
 ACPI Warning: Optional field Pm2ControlBlock has zero address or length: 0x0000000000000450/0x0 (20110623/tbfadt-586)
 ACPI Warning: Invalid length for Pm2ControlBlock: 0, using default 8 (20110623/tbfadt-638)
 cpu0 at mainbus0 apid 0
-cpu1 at mainbus0 apid 16
-cpu2 at mainbus0 apid 4
-cpu3 at mainbus0 apid 2
-cpu4 at mainbus0 apid 20
-cpu5 at mainbus0 apid 18
-cpu6 at mainbus0 apid 17
-cpu7 at mainbus0 apid 5
+cpu1 at mainbus0 apid 18
+cpu2 at mainbus0 apid 20
+cpu3 at mainbus0 apid 16
+cpu4 at mainbus0 apid 4
+cpu5 at mainbus0 apid 2
+cpu6 at mainbus0 apid 19
+cpu7 at mainbus0 apid 21
 cpu8 at mainbus0 apid 3
-cpu9 at mainbus0 apid 21
-cpu10 at mainbus0 apid 19
+cpu9 at mainbus0 apid 17
+cpu10 at mainbus0 apid 5
 cpu11 at mainbus0 apid 1
 ioapic0 at mainbus0 apid 16: pa 0xfec00000, version 20, 24 pins
 ioapic0: can't remap to apid 16
@@ -153,7 +153,7 @@
 pci7: i/o space, memory space enabled
 re0 at pci7 dev 0 function 0: RealTek 8168/8111 PCIe Gigabit Ethernet (rev. 0x03)
 re0: interrupting at ioapic0 pin 18, event channel 8
-re0: Ethernet address 00:1f:bc:09:3b:af
+re0: Ethernet address 00:1f:bc:09:3b:9f
 re0: using 256 tx descriptors
 rgephy0 at re0 phy 7: RTL8169S/8110S/8211 1000BASE-T media interface, rev. 2
 rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
@@ -163,7 +163,7 @@
 pci8: i/o space, memory space enabled
 re1 at pci8 dev 0 function 0: RealTek 8168/8111 PCIe Gigabit Ethernet (rev. 0x03)
 re1: interrupting at ioapic0 pin 16, event channel 4
-re1: Ethernet address 00:1f:bc:09:3b:b0
+re1: Ethernet address 00:1f:bc:09:3b:a0
 re1: using 256 tx descriptors
 rgephy1 at re1 phy 7: RTL8169S/8110S/8211 1000BASE-T media interface, rev. 2
 rgephy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
@@ -199,17 +199,21 @@
 ichlpcib0: 24-bit timer
 ichlpcib0: TCO timer reboot disabled by hardware; hope SMBIOS properly handles it.
 ichlpcib0: TCO (watchdog) timer configured.
-ahcisata1 at pci0 dev 31 function 2: vendor 0x8086 product 0x3a22 (rev. 0x00)
-ahcisata1: interrupting at ioapic0 pin 19, event channel 7
-ahcisata1: 64-bit DMA
-ahcisata1: AHCI revision 1.20, 6 ports, 32 slots, CAP 0xef20ffc5<EMS,CCCS,PSC,SSC,PMD,ISS=0x2=Gen2,SCLO,SAL,SALP,SSS,SSNTF,SNCQ,S64A>
-atabus10 at ahcisata1 channel 0
-atabus11 at ahcisata1 channel 1
-atabus12 at ahcisata1 channel 2
-atabus13 at ahcisata1 channel 3
-atabus14 at ahcisata1 channel 4
-atabus15 at ahcisata1 channel 5
+piixide0 at pci0 dev 31 function 2: Intel 82801JI Serial ATA Controller (ICH10) (rev. 0x00)
+piixide0: bus-master DMA support present
+piixide0: primary channel configured to native-PCI mode
+piixide0: using ioapic0 pin 19, event channel 7 for native-PCI interrupt
+atabus10 at piixide0 channel 0
+piixide0: secondary channel configured to native-PCI mode
+atabus11 at piixide0 channel 1
 vendor 0x8086 product 0x3a30 (SMBus serial bus) at pci0 dev 31 function 3 not configured
+piixide1 at pci0 dev 31 function 5: Intel 82801JI Serial ATA Controller (ICH10) (rev. 0x00)
+piixide1: bus-master DMA support present
+piixide1: primary channel wired to native-PCI mode
+piixide1: using ioapic0 pin 19, event channel 7 for native-PCI interrupt
+atabus12 at piixide1 channel 0
+piixide1: secondary channel wired to native-PCI mode
+atabus13 at piixide1 channel 1
 isa0 at ichlpcib0
 fwohci0: BUS reset
 fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
@@ -236,22 +240,22 @@
 uhub7 at usb7: vendor 0x8086 EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
 uhub7: 6 ports with 6 removable, self powered
 ahcisata0 port 7: device present, speed: 1.5Gb/s
-ahcisata1 port 0: device present, speed: 3.0Gb/s
-ahcisata1 port 1: device present, speed: 1.5Gb/s
 atapibus0 at atabus7: 1 targets
 uk0 at atapibus0 drive 0: <MARVELL VIRTUALL, HKDP221516WL, 1.09> processor removable
 uk0: drive supports PIO mode 4, Ultra-DMA mode 4 (Ultra/66)
 uk0(ahcisata0:7:0): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)
 wd0 at atabus10 drive 0
-wd0: <WDC WD10EARX-00N0YB0>
+wd0: <WDC WD1001FALS-00J7B0>
 wd0: drive supports 16-sector PIO transfers, LBA48 addressing
 wd0: 931 GB, 1938021 cyl, 16 head, 63 sec, 512 bytes/sect x 1953525168 sectors
+wd0: 32-bit data port
 wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
-wd0(ahcisata1:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133) (using DMA)
-atapibus1 at atabus11: 1 targets
-cd0 at atapibus1 drive 0: <SAMSUNG  DVDWBD SH-B083L, R4306GHZ400146, SB00> cdrom removable
+wd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
+atapibus1 at atabus11: 2 targets
+cd0 at atapibus1 drive 0: <SAMSUNG  DVDWBD SH-B083L, R4306GHZ400004, SB00> cdrom removable
+cd0: 32-bit data port
 cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
-cd0(ahcisata1:1:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100) (using DMA)
+cd0(piixide0:1:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)
 Kernelized RAIDframe activated
 boot device: wd0
 root on wd0a dumps on wd0b