Re: Stub domain crash on Xen v4.6.1

[Fanny Dwargee <fdwargee6@gmail.com>]

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Hi Wei,

first: thanks for your effort. :)

Find attached the 'xl create' output and the
/var/log/xen/console/hypervisor.log
files after creating the same domain without the
'device_model_stubdomain_override' configuration option.

'xl list' command output...
Name                 ID   Mem VCPUs      State   Time(s)
Domain-0              0  1023     2     r-----   11608.1
win7-sp1-x64-2       28  2048     1     ------       0.4

Regards,

Fanny




2016-04-06 13:12 GMT+02:00 Wei Liu <wei.liu2@citrix.com>:

> On Tue, Apr 05, 2016 at 05:17:00PM +0200, Fanny Dwargee wrote:
> > Hi,
> >
> > after adding the 'device_model_stubdomain_override = 1' to an otherwise
> > fine configuration the domain crashes on start.
> >
> > Xen is v4.6.1 compiled from source on Debian Jessie 64bits this way:
> >
> >    - ./configure --enable-stubdom --enable-githttp
> >    - make dist-xen
> >    - make dist-tools
> >    - make dist-stubdom
> >    - make install-xen
> >    - make install-tools
> >    - make install-stubdom
> >
> > As pointed out before the same configuration file without the '
> > device_model_stubdomain_override' works flawlessly.
> >
> > This is the 'xl list' command output while the domain is starting:
> >
> > Name                    ID   Mem VCPUs      State   Time(s)
> > Domain-0                 0  1022     2     r-----     318.3
> > win7-sp1-x64-2          20  2048     1     r-----       5.5
> > win7-sp1-x64-2-dm       21    44     1     r-----       6.0
> >
> >
> > As you can see both domains are started (the stub and the original
> domain)
> >
> > Find attached the domain configuration file, 'xl info' output, 'xl
> create'
> > output and the /var/log/xen/console/hypervisor.log file, notice the grant
> > table error on console-hypervisor.log
> >
> > I'd very grateful for any help finding the cause of this problem.
> >
>
>
> The hypervsior log show some error, but unfortunately it is not
> immediately clear what went wrong.
>
> Do you have a working base line setup so that I can compare the
> difference?
>
> Wei.
>
> > Best regards,
> >
> > Fanny
>
>

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[-- Attachment #2: console-hypervisor-success.log --]
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(d28) HVM Loader
(d28) Detected Xen v4.6.1
(d28) Xenbus rings @0xfeffc000, event channel 1
(d28) System requested SeaBIOS
(d28) CPU speed is 2791 MHz
(d28) Relocating guest memory for lowmem MMIO space disabled
(XEN) irq.c:275: Dom28 PCI link 0 changed 0 -> 5
(d28) PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:275: Dom28 PCI link 1 changed 0 -> 10
(d28) PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:275: Dom28 PCI link 2 changed 0 -> 11
(d28) PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:275: Dom28 PCI link 3 changed 0 -> 5
(d28) PCI-ISA link 3 routed to IRQ5
(d28) pci dev 01:2 INTD->IRQ5
(d28) pci dev 01:3 INTA->IRQ10
(d28) pci dev 02:0 INTA->IRQ11
(d28) pci dev 04:0 INTA->IRQ5
(d28) No RAM in high memory; setting high_mem resource base to 100000000
(d28) pci dev 02:0 bar 14 size 001000000: 0f0000008
(d28) pci dev 03:0 bar 10 size 001000000: 0f1000008
(d28) pci dev 04:0 bar 30 size 000040000: 0f2000000
(d28) pci dev 04:0 bar 10 size 000020000: 0f2040000
(d28) pci dev 03:0 bar 30 size 000010000: 0f2060000
(d28) pci dev 03:0 bar 18 size 000001000: 0f2070000
(d28) pci dev 02:0 bar 10 size 000000100: 00000c001
(d28) pci dev 04:0 bar 14 size 000000040: 00000c101
(d28) pci dev 01:2 bar 20 size 000000020: 00000c141
(d28) pci dev 01:1 bar 20 size 000000010: 00000c161
(d28) Multiprocessor initialisation:
(d28)  - CPU0 ... 36-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d28)  - CPU1 ... 36-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d28) Testing HVM environment:
(d28)  - REP INSB across page boundaries ... passed
(d28)  - GS base MSRs and SWAPGS ... passed
(d28) Passed 2 of 2 tests
(d28) Writing SMBIOS tables ...
(d28) Loading SeaBIOS ...
(d28) Creating MP tables ...
(d28) Loading ACPI ...
(d28) vm86 TSS at fc00a180
(d28) BIOS map:
(d28)  10000-100d3: Scratch space
(d28)  c0000-fffff: Main BIOS
(d28) E820 table:
(d28)  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(d28)  HOLE: 00000000:000a0000 - 00000000:000c0000
(d28)  [01]: 00000000:000c0000 - 00000000:00100000: RESERVED
(d28)  [02]: 00000000:00100000 - 00000000:7f000000: RAM
(d28)  HOLE: 00000000:7f000000 - 00000000:fc000000
(d28)  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(d28) Invoking SeaBIOS ...
(d28) SeaBIOS (version rel-1.8.2-0-g33fbe13-20160405_085824-vmi-test)
(d28) 
(d28) Found Xen hypervisor signature at 40000000
(d28) Running on QEMU (i440fx)
(d28) xen: copy e820...
(d28) Relocating init from 0x000df3a0 to 0x7efaf480 (size 68288)
(d28) CPU Mhz=2792
(d28) Found 8 PCI devices (max PCI bus is 00)
(d28) Allocated Xen hypercall page at 7efff000
(d28) Detected Xen v4.6.1
(d28) xen: copy BIOS tables...
(d28) Copying SMBIOS entry point from 0x00010010 to 0x000f66f0
(d28) Copying MPTABLE from 0xfc001160/fc001170 to 0x000f65f0
(d28) Copying PIR from 0x00010030 to 0x000f6570
(d28) Copying ACPI RSDP from 0x000100b0 to 0x000f6540
(d28) Using pmtimer, ioport 0xb008
(d28) Scan for VGA option rom
(d28) Running option rom at c000:0003
(XEN) stdvga.c:173:d28v0 entering stdvga mode
(XEN) stdvga.c:117:d28v0 entering caching mode
(d28) pmm call arg1=0
(d28) Turning on vga text mode console
(XEN) stdvga.c:126:d28v0 leaving caching mode
(d28) SeaBIOS (version rel-1.8.2-0-g33fbe13-20160405_085824-vmi-test)
(d28) Machine UUID 78abeef6-152f-4e1e-8c52-2c233a7dcae0
(d28) UHCI init on dev 00:01.2 (io=c140)
(d28) Found 0 lpt ports
(d28) Found 1 serial ports
(d28) ATA controller 1 at 1f0/3f4/0 (irq 14 dev 9)
(d28) ATA controller 2 at 170/374/0 (irq 15 dev 9)
(d28) ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (10240 MiBytes)
(d28) Searching bootorder for: /pci@i0cf8/*@1,1/drive@0/disk@0
(d28) DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
(d28) Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
(d28) PS2 keyboard initialized
(d28) All threads complete.
(d28) Scan for option roms
(d28) Running option rom at c980:0003
(d28) pmm call arg1=1
(d28) pmm call arg1=0
(d28) pmm call arg1=1
(d28) pmm call arg1=0
(d28) Searching bootorder for: /pci@i0cf8/*@4
(d28) 
(d28) Press F12 for boot menu.
(d28) 
(d28) Searching bootorder for: HALT
(d28) drive 0x000f64f0: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=20971520
(d28) Space available for UMB: ca800-ee800, f5f10-f6490
(d28) Returned 258048 bytes of ZoneHigh
(d28) e820 map has 6 items:
(d28)   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(d28)   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(d28)   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(d28)   3: 0000000000100000 - 000000007efff000 = 1 RAM
(d28)   4: 000000007efff000 - 000000007f000000 = 2 RESERVED
(d28)   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(d28) enter handle_19:
(d28)   NULL
(d28) Booting from Hard Disk...
(d28) Booting from 0000:7c00
(XEN) irq.c:275: Dom28 PCI link 0 changed 5 -> 0
(XEN) irq.c:275: Dom28 PCI link 1 changed 10 -> 0
(XEN) irq.c:275: Dom28 PCI link 2 changed 11 -> 0
(XEN) irq.c:275: Dom28 PCI link 3 changed 5 -> 0

[-- Attachment #3: xl-create-success.log --]
[-- Type: application/octet-stream, Size: 13631 bytes --]

Parsing config from win7-sp1-x64-2.cfg
libxl: debug: libxl_create.c:1560:do_domain_create: ao 0x63d130: create: how=(nil) callback=(nil) poller=0x647830
libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=unknown
libxl: debug: libxl_device.c:298:libxl__device_disk_set_backend: Disk vdev=hda, using backend phy
libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hdc spec.backend=unknown
libxl: debug: libxl_device.c:298:libxl__device_disk_set_backend: Disk vdev=hdc, using backend phy
libxl: debug: libxl_create.c:945:initiate_domain_create: running bootloader
libxl: debug: libxl_bootloader.c:324:libxl__bootloader_run: not a PV domain, skipping bootloader
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x63db18: deregister unregistered
xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0xc52e4
xc: detail: elf_parse_binary: memory: 0x100000 -> 0x1c52e4
xc: detail: VIRTUAL MEMORY ARRANGEMENT:
xc: detail:   Loader:   0000000000100000->00000000001c52e4
xc: detail:   Modules:  0000000000000000->0000000000000000
xc: detail:   TOTAL:    0000000000000000->000000007f000000
xc: detail:   ENTRY:    000000000010002c
xc: detail: PHYSICAL MEMORY ALLOCATION:
xc: detail:   4KB PAGES: 0x0000000000000200
xc: detail:   2MB PAGES: 0x00000000000003f7
xc: detail:   1GB PAGES: 0x0000000000000000
xc: detail: elf_load_binary: phdr 0 at 0x7f6233daf000 -> 0x7f6233e6a758
domainbuilder: detail: xc_dom_gnttab_hvm_seed: called, pfn=0xff000
libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=phy
libxl: debug: libxl_event.c:639:libxl__ev_xswatch_register: watch w=0x63fee0 wpath=/local/domain/0/backend/vbd/28/768/state token=3/0: register slotnum=3
libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hdc spec.backend=phy
libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hdc spec.backend=phy
libxl: debug: libxl_event.c:639:libxl__ev_xswatch_register: watch w=0x6411b0 wpath=/local/domain/0/backend/vbd/28/5632/state token=2/1: register slotnum=2
libxl: debug: libxl_create.c:1583:do_domain_create: ao 0x63d130: inprogress: poller=0x647830, flags=i
libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x63fee0 wpath=/local/domain/0/backend/vbd/28/768/state token=3/0: event epath=/local/domain/0/backend/vbd/28/768/state
libxl: debug: libxl_event.c:880:devstate_callback: backend /local/domain/0/backend/vbd/28/768/state wanted state 2 ok
libxl: debug: libxl_event.c:677:libxl__ev_xswatch_deregister: watch w=0x63fee0 wpath=/local/domain/0/backend/vbd/28/768/state token=3/0: deregister slotnum=3
libxl: debug: libxl_device.c:937:device_backend_callback: calling device_backend_cleanup
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x63fee0: deregister unregistered
libxl: debug: libxl_linux.c:229:libxl__hotplug_disk: Args and environment ready
libxl: debug: libxl_device.c:1034:device_hotplug: calling hotplug script: /etc/xen/scripts/block add
libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to execute: /etc/xen/scripts/block add 
libxl: debug: libxl_event.c:545:watchfd_callback: watch epath=/local/domain/0/backend/vbd/28/768/state token=3/0: empty slot
libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x6411b0 wpath=/local/domain/0/backend/vbd/28/5632/state token=2/1: event epath=/local/domain/0/backend/vbd/28/5632/state
libxl: debug: libxl_event.c:880:devstate_callback: backend /local/domain/0/backend/vbd/28/5632/state wanted state 2 ok
libxl: debug: libxl_event.c:677:libxl__ev_xswatch_deregister: watch w=0x6411b0 wpath=/local/domain/0/backend/vbd/28/5632/state token=2/1: deregister slotnum=2
libxl: debug: libxl_device.c:937:device_backend_callback: calling device_backend_cleanup
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6411b0: deregister unregistered
libxl: debug: libxl_linux.c:229:libxl__hotplug_disk: Args and environment ready
libxl: debug: libxl_device.c:1034:device_hotplug: calling hotplug script: /etc/xen/scripts/block add
libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to execute: /etc/xen/scripts/block add 
libxl: debug: libxl_event.c:545:watchfd_callback: watch epath=/local/domain/0/backend/vbd/28/5632/state token=2/1: empty slot
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x63ffe0: deregister unregistered
libxl: debug: libxl_linux.c:246:libxl__get_hotplug_script_info: num_exec 1, not running hotplug scripts
libxl: debug: libxl_device.c:1021:device_hotplug: No hotplug script to execute
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x63ffe0: deregister unregistered
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6412b0: deregister unregistered
libxl: debug: libxl_linux.c:246:libxl__get_hotplug_script_info: num_exec 1, not running hotplug scripts
libxl: debug: libxl_device.c:1021:device_hotplug: No hotplug script to execute
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6412b0: deregister unregistered
libxl: debug: libxl_dm.c:1778:libxl__spawn_local_dm: Spawning device-model /usr/local/lib/xen/bin/qemu-system-i386 with arguments:
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   /usr/local/lib/xen/bin/qemu-system-i386
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -xen-domid
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   28
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-28,server,nowait
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -no-shutdown
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -mon
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   chardev=libxl-cmd,mode=control
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -chardev
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-28,server,nowait
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -mon
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   chardev=libxenstat-cmd,mode=control
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -nodefaults
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -name
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   win7-sp1-x64-2
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -vnc
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   0.0.0.0:2
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -display
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   none
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -serial
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   pty
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   VGA,vgamem_mb=16
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -boot
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   order=cd
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -usb
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -usbdevice
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   tablet
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -smp
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   2,maxcpus=2
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -device
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   e1000,id=nic0,netdev=net0,mac=00:06:5b:66:66:66
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -netdev
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   type=tap,id=net0,ifname=vif28.0-emu,script=no,downscript=no
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -machine
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   xenfv
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -nodefaults
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -m
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   2032
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -drive
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   file=/dev/group-vm/win7-sp1-x64-2,if=ide,index=0,media=disk,format=raw,cache=writeback
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   -drive
libxl: debug: libxl_dm.c:1780:libxl__spawn_local_dm:   file=/opt/iso/win7-ultimate-sp1-x64-lite-full-without-asian-languages-by-nil.iso,if=ide,index=2,readonly=on,media=cdrom,format=raw,cache=writeback,id=ide-5632
libxl: debug: libxl_event.c:639:libxl__ev_xswatch_register: watch w=0x63de10 wpath=/local/domain/0/device-model/28/state token=2/2: register slotnum=2
libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x63de10 wpath=/local/domain/0/device-model/28/state token=2/2: event epath=/local/domain/0/device-model/28/state
libxl: debug: libxl_exec.c:399:spawn_watch_event: domain 28 device model: spawn watch p=(null)
libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x63de10 wpath=/local/domain/0/device-model/28/state token=2/2: event epath=/local/domain/0/device-model/28/state
libxl: debug: libxl_exec.c:399:spawn_watch_event: domain 28 device model: spawn watch p=running
libxl: debug: libxl_event.c:677:libxl__ev_xswatch_deregister: watch w=0x63de10 wpath=/local/domain/0/device-model/28/state token=2/2: deregister slotnum=2
libxl: debug: libxl_exec.c:129:libxl_report_child_exitstatus: domain 28 device model (dying as expected) [13928] died due to fatal signal Killed
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x63de10: deregister unregistered
libxl: debug: libxl_qmp.c:706:libxl__qmp_initialize: connected to /var/run/xen/qmp-libxl-28
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: qmp
libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
    "execute": "qmp_capabilities",
    "id": 1
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return
libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
    "execute": "query-chardev",
    "id": 2
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return
libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
    "execute": "change",
    "id": 3,
    "arguments": {
        "device": "vnc",
        "target": "password",
        "arg": ""
    }
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: error
libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error message from QMP server: Could not set password
libxl: debug: libxl_event.c:639:libxl__ev_xswatch_register: watch w=0x6450e0 wpath=/local/domain/0/backend/vif/28/0/state token=2/3: register slotnum=2
libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x6450e0 wpath=/local/domain/0/backend/vif/28/0/state token=2/3: event epath=/local/domain/0/backend/vif/28/0/state
libxl: debug: libxl_event.c:884:devstate_callback: backend /local/domain/0/backend/vif/28/0/state wanted state 2 still waiting state 1
libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x6450e0 wpath=/local/domain/0/backend/vif/28/0/state token=2/3: event epath=/local/domain/0/backend/vif/28/0/state
libxl: debug: libxl_event.c:880:devstate_callback: backend /local/domain/0/backend/vif/28/0/state wanted state 2 ok
libxl: debug: libxl_event.c:677:libxl__ev_xswatch_deregister: watch w=0x6450e0 wpath=/local/domain/0/backend/vif/28/0/state token=2/3: deregister slotnum=2
libxl: debug: libxl_device.c:937:device_backend_callback: calling device_backend_cleanup
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6450e0: deregister unregistered
libxl: debug: libxl_device.c:1034:device_hotplug: calling hotplug script: /etc/xen/scripts/vif-openvswitch online
libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to execute: /etc/xen/scripts/vif-openvswitch online 
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6451e0: deregister unregistered
libxl: debug: libxl_device.c:1034:device_hotplug: calling hotplug script: /etc/xen/scripts/vif-openvswitch add
libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to execute: /etc/xen/scripts/vif-openvswitch add 
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6451e0: deregister unregistered
libxl: debug: libxl_linux.c:259:libxl__get_hotplug_script_info: num_exec 2, not running hotplug scripts
libxl: debug: libxl_device.c:1021:device_hotplug: No hotplug script to execute
libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch w=0x6451e0: deregister unregistered
libxl: debug: libxl_event.c:2183:libxl__ao_progress_report: ao 0x63d130: progress report: ignored
libxl: debug: libxl_event.c:1874:libxl__ao_complete: ao 0x63d130: complete, rc=0
libxl: debug: libxl_event.c:1843:libxl__ao__destroy: ao 0x63d130: destroy
libxl: debug: libxl_qmp.c:706:libxl__qmp_initialize: connected to /var/run/xen/qmp-libxl-28
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: qmp
libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
    "execute": "qmp_capabilities",
    "id": 1
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return
libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
    "execute": "cont",
    "id": 2
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return
xc: debug: hypercall buffer: total allocations:1006 total releases:1006
xc: debug: hypercall buffer: current allocations:0 maximum allocations:3
xc: debug: hypercall buffer: cache current size:3
xc: debug: hypercall buffer: cache hits:995 misses:3 toobig:8

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