[Xen-users] Error with 5+ network interfaces

[Nate Soule <nsoule@xxxxxxx>]

I posted this question on the Xen general form, but got the advice that this was a complex enough issue that this mailing list may be the better venue. Any advice would be greatly appreciated. See original posting below.
Thanks.
-Nate
---------------------------------------------------------
Hi, I'm attempting to create/start a guest VM with 5 network interfaces (all bridges, specified in vif= line in config file, see below). With 1, 2, 3, and 4 interfaces defined the VM starts perfectly fine. With 5 or more interfaces defined I get the following errors upon executing "sudo xl create SWITCH.cfg"

Parsing config from SWITCH.cfg
libxl: error: libxl_dm.c:1388:device_model_spawn_outcome: domain 16 device model: spawn failed (rc=-3)
libxl: error: libxl_create.c:1186:domcreate_devmodel_started: device model did not start: -3
libxl: error: libxl_dm.c:1492:kill_device_model: Device Model already exited

and the VM does not start.

Is there any known limitation on number of network interfaces?

Both dom0 and the domU are Ubuntu 14.04 (server edition). I have replicated this on two separate physical machines (one with 8 GB RAM, the other with 32 GB, in case it's relevant). I'm using Xen 4.4.1.

I tried on a 3rd machine running Xen 4.1.6.1 and I do not appear to get the issue there.

My configuration looks like:
name="SWITCH"
builder="hvm"
vif=['bridge=xenbr0', 'bridge=xenbr1', 'bridge=xenbr2', 'bridge=xenbr3', 'bridge=xenbr4']
memory=1024
vcpus=1
disk=['file:/kage/vms/SWITCH.img,hda,w','file:/kage/vms/ubuntu14-04-2.iso,hdc,cdrom,r']
vnc=1
boot="cd"
vnclisten="0.0.0.0"

This log file /var/log/xen/qemu-dm-SWITCH.log looks like:

qemu: hardware error: xen: failed to populate ram at 40110000
CPU #0:
EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000663
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 00000000 0000ffff 00009300
CS =f000 ffff0000 0000ffff 00009b00
SS =0000 00000000 0000ffff 00009300
DS =0000 00000000 0000ffff 00009300
FS =0000 00000000 0000ffff 00009300
GS =0000 00000000 0000ffff 00009300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT= 00000000 0000ffff
IDT= 00000000 0000ffff
CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000
DR6=ffff0ff0 DR7=00000400
EFER=0000000000000000
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000

Thanks in advance for any advice.

-Nate

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