[Xen-users] adding fourth device to pvhvm config causes DomU launch fail @ "device_disk_add: device already exists in xenstore" ?

[suse.dev@xxxxxx]

I run

        rpm -qa | grep -i xen-4
                xen-4.6.1_01-409.1.x86_64

on

        uname -r
                4.4.2-1.gf12d966-default

I have a PVHVM guest that boot fine, with config

        cat /home/test/arch.cfg
                name = 'arch-template'
                builder = 'hvm'
                xen_platform_pci = 1
                device_model_version="qemu-xen"
                boot = 'cd'
                hdtype = 'ahci'
                acpi = 1
                apic = 1
                disk = [ 'phy:/dev/VG0/tEFI,hda,w',
                         'phy:/dev/VG0/tBOOT,hdb,w',
                         'phy:/dev/VG0/tSWAP,hdc,w',
                         
'file:/home/test/archlinux-2016.02.01-dual.iso,hdd:cdrom,r',]
                ...

        xl create ./arch.cfg
         xenstore-ls | grep params  | grep arch
       params = "/dev/VG0/tEFI"
       params = "/dev/VG0/tBOOT"
       params = "/dev/VG0/tSWAP"
       params = "/home/test/archlinux-2016.02.01-dual.iso"

If, however, I add a fourth hdX, i.e.,

                         'phy:/dev/VG0/tSWAP,hdc,w',
        +                'phy:/dev/VG0/tROOT,hdd,w',
                         
'file:/home/test/archlinux-2016.02.01-dual.iso,hdd:cdrom,r',]

Then, the guest launch fails with

        xl create ./arch.cfg

                Parsing config from ./arch.cfg
                got a tsc mode string: "default"
                libxl: error: libxl.c:2735:device_disk_add: device already 
exists in xenstore
                libxl: error: libxl_create.c:1175:domcreate_launch_dm: unable 
to add disk devices
                libxl: error: libxl_dm.c:1966:kill_device_model: unable to find 
device model pid in /local/domain/9/image/device-model-pid
                libxl: error: libxl.c:1628:libxl__destroy_domid: 
libxl__destroy_device_model failed for 9
                libxl: error: libxl.c:1591:libxl__destroy_domid: non-existant 
domain 9
                libxl: error: libxl.c:1549:domain_destroy_callback: unable to 
destroy guest with domid 9
                libxl: error: libxl.c:1476:domain_destroy_cb: destruction of 
domain 9 failed

         xenstore-ls | grep params  | grep arch
                (empty)

I can see no immediate reason for this fail.  Is there a limit on # of drives 
in HVM?


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