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[Xen-devel] Re: Problem with DomU devices not found after domain reboot using Xen 4.1.1 on NetBSD



Well, doing some more tests I've found that this doesn't happen all
the time, only when Dom0 doesn't detach the devices when the machine
is shutdown. Usually I see:

xbd backend: detach device dm0f for domain 11
xbd backend: detach device dm0d for domain 11
xbd backend: detach device dm0e for domain 11

But sometimes, and I don't know why, devices are not detached.

2011/7/1 Roger Pau Monnà <roger.pau@xxxxxxxxxxxxx>:
> Hello,
>
> When rebooting a Debian DomU PV with Xen 4.1.1 on NetBSD Dom0, the
> guests can no longer access any devices (or I think so), so it is
> unable to find the disk and boot the system. This happens when
> performing a reboot inside the machine or when shutting it down and
> starting again (with xm shutdown <domu> xm create <domu>). The
> configuration file used is:
>
> bootloader = '/usr/pkg/bin/pygrub'
>
> vcpus    = '1'
> memory   Â= '1024'
>
> root    Â= '/dev/xvda2 ro'
> disk    Â= [
> Â Â Â Â Â Â Â Â Â'phy:/dev/mapper/guests-one,xvda2,w',
> Â Â Â Â Â Â Â Â Â'phy:/dev/mapper/guests-oneswap,xvda1,w',
> Â Â Â Â Â Â Â Â Â'phy:/dev/mapper/guests-images,xvdb,w',
> Â Â Â Â Â Â Â]
>
> name    Â= 'one'
> vif     = [ 'mac=00:16:3E:9C:F2:5E, bridge=bridge1' ]
>
> on_poweroff = 'destroy'
> on_reboot  = 'restart'
> on_crash  Â= 'restart'
>
> The trace of xend when falling is the following (there doesn't seem to
> be any error):
>
> [2011-07-01 12:50:08 334] DEBUG (XendDomainInfo:103)
> XendDomainInfo.create(['vm', ['name', 'one'], ['memory', '1024'],
> ['on_poweroff', 'destroy'], ['on_reboot', 'restart'], ['on_crash',
> 'restart'], ['on_xend_start', 'ignore'], ['on_xend_stop', 'ignore'],
> ['vcpus', '1'], ['oos', 1], ['bootloader', '/usr/pkg/bin/pygrub'],
> ['bootloader_args', '-q'], ['image', ['linux', ['root', '/dev/xvda2
> ro'], ['videoram', 4], ['tsc_mode', 0], ['nomigrate', 0]]],
> ['s3_integrity', 1], ['device', ['vbd', ['uname',
> 'phy:/dev/mapper/guests-one'], ['dev', 'xvda2'], ['mode', 'w']]],
> ['device', ['vbd', ['uname', 'phy:/dev/mapper/guests-oneswap'],
> ['dev', 'xvda1'], ['mode', 'w']]], ['device', ['vbd', ['uname',
> 'phy:/dev/mapper/guests-images'], ['dev', 'xvdb'], ['mode', 'w']]],
> ['device', ['vif', ['bridge', 'bridge1'], ['mac',
> '00:16:3E:9C:F2:5E']]]])
> [2011-07-01 12:50:08 334] DEBUG (XendDomainInfo:2498)
> XendDomainInfo.constructDomain
> [2011-07-01 12:50:08 334] DEBUG (balloon:187) Balloon: 14438228 KiB
> free; need 16384; done.
> [2011-07-01 12:50:08 334] DEBUG (XendDomain:476) Adding Domain: 5
> [2011-07-01 12:50:08 334] DEBUG (XendDomainInfo:2836)
> XendDomainInfo.initDomain: 5 256
> [2011-07-01 12:50:08 1116] DEBUG (XendBootloader:114) Launching
> bootloader as ['/usr/pkg/bin/pygrub', '--args=root=/dev/xvda2 ro ',
> '--output=/var/run/xend/boot/xenbl.30826', '-q',
> '/dev/mapper/rguests-one'].
> [2011-07-01 12:50:09 334] DEBUG (XendDomainInfo:2863)
> _initDomain:shadow_memory=0x0, memory_static_max=0x40000000,
> memory_static_min=0x0.
> [2011-07-01 12:50:09 334] INFO (image:182) buildDomain os=linux dom=5 vcpus=1
> [2011-07-01 12:50:09 334] DEBUG (image:721) domid     Â= 5
> [2011-07-01 12:50:09 334] DEBUG (image:722) memsize    Â= 1024
> [2011-07-01 12:50:09 334] DEBUG (image:723) image     Â=
> /var/run/xend/boot/boot_kernel.Np2Nce
> [2011-07-01 12:50:09 334] DEBUG (image:724) store_evtchn  = 1
> [2011-07-01 12:50:09 334] DEBUG (image:725) console_evtchn = 2
> [2011-07-01 12:50:09 334] DEBUG (image:726) cmdline    Â=
> root=/dev/xvda2 ro root=/dev/xvda2 ro
> [2011-07-01 12:50:09 334] DEBUG (image:727) ramdisk    Â=
> /var/run/xend/boot/boot_ramdisk.1TCu4L
> [2011-07-01 12:50:09 334] DEBUG (image:728) vcpus     Â= 1
> [2011-07-01 12:50:09 334] DEBUG (image:729) features    =
> [2011-07-01 12:50:09 334] DEBUG (image:730) flags     Â= 0
> [2011-07-01 12:50:09 334] DEBUG (image:731) superpages   = 0
> [2011-07-01 12:50:10 334] INFO (XendDomainInfo:2357) createDevice: vbd
> : {'uuid': 'b4035cf4-a968-bf67-8b71-b1bb032221b7', 'bootable': 1,
> 'driver': 'paravirtualised', 'dev': 'xvda2', 'uname':
> 'phy:/dev/mapper/guests-one', 'mode': 'w'}
> [2011-07-01 12:50:10 334] DEBUG (DevController:95) DevController:
> writing {'virtual-device': '51714', 'device-type': 'disk', 'protocol':
> 'x86_32-abi', 'backend-id': '0', 'state': '1', 'backend':
> '/local/domain/0/backend/vbd/5/51714'} to
> /local/domain/5/device/vbd/51714.
> [2011-07-01 12:50:10 334] DEBUG (DevController:97) DevController:
> writing {'domain': 'one', 'frontend':
> '/local/domain/5/device/vbd/51714', 'uuid':
> 'b4035cf4-a968-bf67-8b71-b1bb032221b7', 'bootable': '1', 'dev':
> 'xvda2', 'state': '1', 'params': '/dev/mapper/guests-one', 'mode':
> 'w', 'online': '1', 'frontend-id': '5', 'type': 'phy'} to
> /local/domain/0/backend/vbd/5/51714.
> [2011-07-01 12:50:10 334] INFO (XendDomainInfo:2357) createDevice: vbd
> : {'uuid': 'd58b9e34-3921-1d51-4554-3610395dd909', 'bootable': 0,
> 'driver': 'paravirtualised', 'dev': 'xvda1', 'uname':
> 'phy:/dev/mapper/guests-oneswap', 'mode': 'w'}
> [2011-07-01 12:50:10 334] DEBUG (DevController:95) DevController:
> writing {'virtual-device': '51713', 'device-type': 'disk', 'protocol':
> 'x86_32-abi', 'backend-id': '0', 'state': '1', 'backend':
> '/local/domain/0/backend/vbd/5/51713'} to
> /local/domain/5/device/vbd/51713.
> [2011-07-01 12:50:10 334] DEBUG (DevController:97) DevController:
> writing {'domain': 'one', 'frontend':
> '/local/domain/5/device/vbd/51713', 'uuid':
> 'd58b9e34-3921-1d51-4554-3610395dd909', 'bootable': '0', 'dev':
> 'xvda1', 'state': '1', 'params': '/dev/mapper/guests-oneswap', 'mode':
> 'w', 'online': '1', 'frontend-id': '5', 'type': 'phy'} to
> /local/domain/0/backend/vbd/5/51713.
> [2011-07-01 12:50:10 334] INFO (XendDomainInfo:2357) createDevice: vbd
> : {'uuid': '9ed36d54-a229-3919-d5d2-5ffcdf2b54a6', 'bootable': 0,
> 'driver': 'paravirtualised', 'dev': 'xvdb', 'uname':
> 'phy:/dev/mapper/guests-images', 'mode': 'w'}
> [2011-07-01 12:50:10 334] DEBUG (DevController:95) DevController:
> writing {'virtual-device': '51728', 'device-type': 'disk', 'protocol':
> 'x86_32-abi', 'backend-id': '0', 'state': '1', 'backend':
> '/local/domain/0/backend/vbd/5/51728'} to
> /local/domain/5/device/vbd/51728.
> [2011-07-01 12:50:10 334] DEBUG (DevController:97) DevController:
> writing {'domain': 'one', 'frontend':
> '/local/domain/5/device/vbd/51728', 'uuid':
> '9ed36d54-a229-3919-d5d2-5ffcdf2b54a6', 'bootable': '0', 'dev':
> 'xvdb', 'state': '1', 'params': '/dev/mapper/guests-images', 'mode':
> 'w', 'online': '1', 'frontend-id': '5', 'type': 'phy'} to
> /local/domain/0/backend/vbd/5/51728.
> [2011-07-01 12:50:10 334] INFO (XendDomainInfo:2357) createDevice: vif
> : {'bridge': 'bridge1', 'mac': '00:16:3E:9C:F2:5E', 'uuid':
> '5487642b-3781-f3ff-deb5-b7da6d2ee40b'}
> [2011-07-01 12:50:10 334] DEBUG (DevController:95) DevController:
> writing {'mac': '00:16:3E:9C:F2:5E', 'handle': '0', 'protocol':
> 'x86_32-abi', 'backend-id': '0', 'state': '1', 'backend':
> '/local/domain/0/backend/vif/5/0'} to /local/domain/5/device/vif/0.
> [2011-07-01 12:50:10 334] DEBUG (DevController:97) DevController:
> writing {'bridge': 'bridge1', 'domain': 'one', 'handle': '0', 'uuid':
> '5487642b-3781-f3ff-deb5-b7da6d2ee40b', 'script':
> '/usr/pkg/etc/xen/scripts/vif-bridge', 'mac': '00:16:3E:9C:F2:5E',
> 'frontend-id': '5', 'state': '1', 'online': '1', 'frontend':
> '/local/domain/5/device/vif/0'} to /local/domain/0/backend/vif/5/0.
> [2011-07-01 12:50:10 334] DEBUG (XendDomainInfo:3420) Storing VM
> details: {'on_xend_stop': 'ignore', 'pool_name': 'Pool-0',
> 'shadow_memory': '0', 'uuid': '714dbd21-4665-1737-b76e-40a44eaf9f9a',
> 'on_reboot': 'restart', 'start_time': '1309517410.33', 'on_poweroff':
> 'destroy', 'bootloader_args': '-q', 'on_xend_start': 'ignore',
> 'on_crash': 'restart', 'xend/restart_count': '0', 'vcpus': '1',
> 'vcpu_avail': '1', 'bootloader': '/usr/pkg/bin/pygrub', 'image':
> "(linux (kernel '') (args 'root=/dev/xvda2 ro ') (superpages 0)
> (videoram 4) (pci ()) (nomigrate 0) (tsc_mode 0) (notes (HV_START_LOW
> 4118806528) (FEATURES '!writable_page_tables|pae_pgdir_above_4gb')
> (VIRT_BASE 3221225472) (GUEST_VERSION 2.6) (PADDR_OFFSET 0) (GUEST_OS
> linux) (HYPERCALL_PAGE 3238010880) (LOADER generic) (SUSPEND_CANCEL 1)
> (PAE_MODE yes) (ENTRY 3242176512) (XEN_VERSION xen-3.0)))", 'name':
> 'one'}
> [2011-07-01 12:50:10 334] DEBUG (XendDomainInfo:1794) Storing domain
> details: {'console/ring-ref': '2237141', 'image/entry': '3242176512',
> 'console/port': '2', 'store/ring-ref': '2237142', 'image/loader':
> 'generic', 'vm': '/vm/714dbd21-4665-1737-b76e-40a44eaf9f9a',
> 'control/platform-feature-multiprocessor-suspend': '1',
> 'image/hv-start-low': '4118806528', 'image/guest-os': 'linux',
> 'image/virt-base': '3221225472', 'memory/target': '1048576',
> 'image/guest-version': '2.6', 'image/pae-mode': 'yes', 'description':
> '', 'console/limit': '1048576', 'image/paddr-offset': '0',
> 'image/hypercall-page': '3238010880', 'image/suspend-cancel': '1',
> 'cpu/0/availability': 'online', 'image/features/pae-pgdir-above-4gb':
> '1', 'image/features/writable-page-tables': '0', 'console/type':
> 'xenconsoled', 'name': 'one', 'domid': '5', 'image/xen-version':
> 'xen-3.0', 'store/port': '1'}
> [2011-07-01 12:50:10 334] DEBUG (DevController:95) DevController:
> writing {'protocol': 'x86_32-abi', 'state': '1', 'backend-id': '0',
> 'backend': '/local/domain/0/backend/console/5/0'} to
> /local/domain/5/device/console/0.
> [2011-07-01 12:50:10 334] DEBUG (DevController:97) DevController:
> writing {'domain': 'one', 'frontend':
> '/local/domain/5/device/console/0', 'uuid':
> 'daa05ecd-7272-60a1-5d00-0c1dc3d7a19c', 'frontend-id': '5', 'state':
> '1', 'location': '2', 'online': '1', 'protocol': 'vt100'} to
> /local/domain/0/backend/console/5/0.
> [2011-07-01 12:50:10 334] DEBUG (XendDomainInfo:1881)
> XendDomainInfo.handleShutdownWatch
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices tap2.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vif.
> [2011-07-01 12:50:10 334] DEBUG (DevController:144) Waiting for 0.
> [2011-07-01 12:50:10 334] DEBUG (DevController:628)
> hotplugStatusCallback /local/domain/0/backend/vif/5/0/hotplug-status.
> [2011-07-01 12:50:10 334] DEBUG (DevController:642) hotplugStatusCallback 1.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vkbd.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices 
> ioports.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices tap.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vif2.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices 
> console.
> [2011-07-01 12:50:10 334] DEBUG (DevController:144) Waiting for 0.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vscsi.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vbd.
> [2011-07-01 12:50:10 334] DEBUG (DevController:144) Waiting for 51714.
> [2011-07-01 12:50:10 334] DEBUG (DevController:628)
> hotplugStatusCallback
> /local/domain/0/backend/vbd/5/51714/hotplug-status.
> [2011-07-01 12:50:10 334] DEBUG (DevController:642) hotplugStatusCallback 1.
> [2011-07-01 12:50:10 334] DEBUG (DevController:144) Waiting for 51713.
> [2011-07-01 12:50:10 334] DEBUG (DevController:628)
> hotplugStatusCallback
> /local/domain/0/backend/vbd/5/51713/hotplug-status.
> [2011-07-01 12:50:10 334] DEBUG (DevController:642) hotplugStatusCallback 1.
> [2011-07-01 12:50:10 334] DEBUG (DevController:144) Waiting for 51728.
> [2011-07-01 12:50:10 334] DEBUG (DevController:628)
> hotplugStatusCallback
> /local/domain/0/backend/vbd/5/51728/hotplug-status.
> [2011-07-01 12:50:10 334] DEBUG (DevController:642) hotplugStatusCallback 1.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices irq.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vfb.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices pci.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vusb.
> [2011-07-01 12:50:10 334] DEBUG (DevController:139) Waiting for devices vtpm.
> [2011-07-01 12:50:10 334] INFO (XendDomain:1225) Domain one (5) unpaused.
>
> So if I shutdown one of my guests, I have to restart the Dom0 to be
> able to launch the domain again. Also the kernel messages in the Dom0
> when the machine cannot attach the devices:
>
> xbdback backend/vbd/5/51714: can't VOP_OPEN device 0xa904: 16
> xbdback backend/vbd/5/51714: can't VOP_OPEN device 0xa904: 16
> xbdback backend/vbd/5/51713: can't VOP_OPEN device 0xa903: 16
> xbdback backend/vbd/5/51713: can't VOP_OPEN device 0xa903: 16
> xbdback backend/vbd/5/51728: can't VOP_OPEN device 0xa905: 16
> xbdback backend/vbd/5/51728: can't VOP_OPEN device 0xa905: 16
> xvif5i0: Ethernet address 00:16:3e:9d:f2:5e
> xbd backend domain 5 handle 0xca02 (51714) using event channel 34,
> protocol x86_32-abi
> xbd backend domain 5 handle 0xca01 (51713) using event channel 35,
> protocol x86_32-abi
> xbd backend domain 5 handle 0xca10 (51728) using event channel 36,
> protocol x86_32-abi
>
> These messages in Dom0 are different than the ones shown when the
> devices can be attached correctly, here is the output from the first
> boot of the DomU:
>
> xbd backend: attach device guests-one (size 20971520) for domain 2
> xbdback backend/vbd/2/51714: can't VOP_OPEN device 0xa904: 16
> xbd backend: attach device guests-oneswap (size 2097152) for domain 2
> xbdback backend/vbd/2/51713: can't VOP_OPEN device 0xa903: 16
> xbd backend: attach device guests-images (size 1677721600) for domain 2
> xbdback backend/vbd/2/51728: can't VOP_OPEN device 0xa905: 16
> xvif2i0: Ethernet address 00:16:3e:9d:f2:5e
> xbd backend domain 2 handle 0xca02 (51714) using event channel 20,
> protocol x86_32-abi
> xbd backend domain 2 handle 0xca01 (51713) using event channel 21,
> protocol x86_32-abi
> xbd backend domain 2 handle 0xca10 (51728) using event channel 22,
> protocol x86_32-abi
>
> It seems that the Dom0 is not even trying to attach the devices to the
> guest (again it's just a guess). Finally here's the output form the
> DomU booting sequence:
>
> [ Â Â0.000000] Reserving virtual address space above 0xf5800000
> [ Â Â0.000000] Initializing cgroup subsys cpuset
> [ Â Â0.000000] Initializing cgroup subsys cpu
> [ Â Â0.000000] Linux version 2.6.32-5-xen-686 (Debian 2.6.32-35)
> (dannf@xxxxxxxxxx) (gcc version 4.3.5 (Debian 4.3.5-4) ) #1 SMP Mon
> Jun 13 09:07:50 UTC 2011
> [ Â Â0.000000] KERNEL supported cpus:
> [ Â Â0.000000] Â Intel GenuineIntel
> [ Â Â0.000000] Â AMD AuthenticAMD
> [ Â Â0.000000] Â NSC Geode by NSC
> [ Â Â0.000000] Â Cyrix CyrixInstead
> [ Â Â0.000000] Â Centaur CentaurHauls
> [ Â Â0.000000] Â Transmeta GenuineTMx86
> [ Â Â0.000000] Â Transmeta TransmetaCPU
> [ Â Â0.000000] Â UMC UMC UMC UMC
> [ Â Â0.000000] ACPI in unprivileged domain disabled
> [ Â Â0.000000] released 0 pages of unused memory
> [ Â Â0.000000] BIOS-provided physical RAM map:
> [ Â Â0.000000] ÂXen: 0000000000000000 - 00000000000a0000 (usable)
> [ Â Â0.000000] ÂXen: 00000000000a0000 - 0000000000100000 (reserved)
> [ Â Â0.000000] ÂXen: 0000000000100000 - 0000000040000000 (usable)
> [ Â Â0.000000] DMI not present or invalid.
> [ Â Â0.000000] last_pfn = 0x40000 max_arch_pfn = 0x1000000
> [ Â Â0.000000] init_memory_mapping: 0000000000000000-000000002cffe000
> [ Â Â0.000000] NX (Execute Disable) protection: active
> [ Â Â0.000000] RAMDISK: 0164d000 - 02a35000
> [ Â Â0.000000] 304MB HIGHMEM available.
> [ Â Â0.000000] 719MB LOWMEM available.
> [ Â Â0.000000] Â mapped low ram: 0 - 2cffe000
> [ Â Â0.000000] Â low ram: 0 - 2cffe000
> [ Â Â0.000000] Â node 0 low ram: 00000000 - 2cffe000
> [ Â Â0.000000] Â node 0 bootmap 00007000 - 0000ca00
> [ Â Â0.000000] (9 early reservations) ==> bootmem [0000000000 - 002cffe000]
> [ Â Â0.000000] Â #0 [0000000000 - 0000001000] Â BIOS data page ==>
> [0000000000 - 0000001000]
> [ Â Â0.000000] Â #1 [0002b38000 - 0002b50000] Â XEN PAGETABLES ==>
> [0002b38000 - 0002b50000]
> [ Â Â0.000000] Â #2 [0000001000 - 0000002000] Â ÂEX TRAMPOLINE ==>
> [0000001000 - 0000002000]
> [ Â Â0.000000] Â #3 [0000006000 - 0000007000] Â Â Â TRAMPOLINE ==>
> [0000006000 - 0000007000]
> [ Â Â0.000000] Â #4 [0001000000 - 00015278f4] Â ÂTEXT DATA BSS ==>
> [0001000000 - 00015278f4]
> [ Â Â0.000000] Â #5 [000164d000 - 0002a35000] Â Â Â Â ÂRAMDISK ==>
> [000164d000 - 0002a35000]
> [ Â Â0.000000] Â #6 [0002a35000 - 0002b38000] Â XEN START INFO ==>
> [0002a35000 - 0002b38000]
> [ Â Â0.000000] Â #7 [0000100000 - 0000251000] Â Â Â Â ÂPGTABLE ==>
> [0000100000 - 0000251000]
> [ Â Â0.000000] Â #8 [0000007000 - 000000d000] Â Â Â Â ÂBOOTMAP ==>
> [0000007000 - 000000d000]
> [ Â Â0.000000] Zone PFN ranges:
> [ Â Â0.000000] Â DMA Â Â Â0x00000000 -> 0x00001000
> [  Â0.000000]  Normal  0x00001000 -> 0x0002cffe
> [ Â Â0.000000] Â HighMem Â0x0002cffe -> 0x00040000
> [ Â Â0.000000] Movable zone start PFN for each node
> [ Â Â0.000000] early_node_map[2] active PFN ranges
> [ Â Â0.000000] Â Â 0: 0x00000000 -> 0x000000a0
> [ Â Â0.000000] Â Â 0: 0x00000100 -> 0x00040000
> [ Â Â0.000000] Using APIC driver default
> [ Â Â0.000000] SFI: Simple Firmware Interface v0.7 http://simplefirmware.org
> [ Â Â0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
> [ Â Â0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic"
> [ Â Â0.000000] APIC: disable apic facility
> [ Â Â0.000000] PM: Registered nosave memory: 00000000000a0000 - 
> 0000000000100000
> [ Â Â0.000000] Allocating PCI resources starting at 40000000 (gap:
> 40000000:c0000000)
> [ Â Â0.000000] Booting paravirtualized kernel on Xen
> [ Â Â0.000000] Xen version: 4.1.1 (preserve-AD)
> [ Â Â0.000000] NR_CPUS:32 nr_cpumask_bits:32 nr_cpu_ids:1 nr_node_ids:1
> [ Â Â0.000000] PERCPU: Embedded 15 pages/cpu @c3357000 s37688 r0 d23752 u65536
> [ Â Â0.000000] pcpu-alloc: s37688 r0 d23752 u65536 alloc=16*4096
> [ Â Â0.000000] pcpu-alloc: [0] 0
> [ Â Â0.000000] Xen: using vcpu_info placement
> [ Â Â0.000000] Built 1 zonelists in Zone order, mobility grouping on.
> Total pages: 259999
> [ Â Â0.000000] Kernel command line: root=/dev/xvda2 ro root=/dev/xvda2 ro
> [ Â Â0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
> [ Â Â0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 
> bytes)
> [ Â Â0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> [ Â Â0.000000] Enabling fast FPU save and restore... done.
> [ Â Â0.000000] Enabling unmasked SIMD FPU exception support... done.
> [ Â Â0.000000] Initializing CPU#0
> [ Â Â0.000000] Initializing HighMem for node 0 (0002cffe:00040000)
> [ Â Â0.000000] Memory: 1010276k/1048576k available (2636k kernel code,
> 37240k reserved, 1438k data, 404k init, 311304k highmem)
> [ Â Â0.000000] virtual kernel memory layout:
> [ Â Â0.000000] Â Â fixmap Â: 0xf5556000 - 0xf57ff000 Â (2724 kB)
> [  Â0.000000]   pkmap  : 0xf5000000 - 0xf5200000  (2048 kB)
> [ Â Â0.000000] Â Â vmalloc : 0xed7fe000 - 0xf4ffe000 Â ( 120 MB)
> [ Â Â0.000000] Â Â lowmem Â: 0xc0000000 - 0xecffe000 Â ( 719 MB)
> [ Â Â0.000000] Â Â Â .init : 0xc13fb000 - 0xc1460000 Â ( 404 kB)
> [ Â Â0.000000] Â Â Â .data : 0xc1293071 - 0xc13fab18 Â (1438 kB)
> [ Â Â0.000000] Â Â Â .text : 0xc1000000 - 0xc1293071 Â (2636 kB)
> [ Â Â0.000000] SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0,
> CPUs=1, Nodes=1
> [ Â Â0.000000] Hierarchical RCU implementation.
> [ Â Â0.000000] NR_IRQS:1536
> [ Â Â0.000000] Console: colour dummy device 80x25
> [ Â Â0.000000] console [tty0] enabled
> [ Â Â0.000000] console [hvc0] enabled
> [ Â Â0.000000] installing Xen timer for CPU 0
> [ Â Â0.000000] Detected 2128.064 MHz processor.
> [ Â Â0.004000] Calibrating delay loop (skipped), value calculated
> using timer frequency.. 4256.12 BogoMIPS (lpj=8512256)
> [ Â Â0.004000] Security Framework initialized
> [ Â Â0.004000] SELinux: ÂDisabled at boot.
> [ Â Â0.004000] Mount-cache hash table entries: 512
> [ Â Â0.004000] Initializing cgroup subsys ns
> [ Â Â0.004000] Initializing cgroup subsys cpuacct
> [ Â Â0.004000] Initializing cgroup subsys devices
> [ Â Â0.004000] Initializing cgroup subsys freezer
> [ Â Â0.004000] Initializing cgroup subsys net_cls
> [ Â Â0.004000] CPU: L1 I cache: 32K, L1 D cache: 32K
> [ Â Â0.004000] CPU: L2 cache: 256K
> [ Â Â0.004000] CPU: L3 cache: 8192K
> [ Â Â0.004000] CPU: Unsupported number of siblings 32
> [ Â Â0.004000] Performance Events: unsupported p6 CPU model 44 no PMU
> driver, software events only.
> [ Â Â0.004000] SMP alternatives: switching to UP code
> [ Â Â0.004000] Freeing SMP alternatives: 14k freed
> [ Â Â0.004176] Brought up 1 CPUs
> [ Â Â0.004312] devtmpfs: initialized
> [ Â Â0.004811] Grant table initialized
> [ Â Â0.004820] regulator: core version 0.5
> [ Â Â0.004887] NET: Registered protocol family 16
> [ Â Â0.005714] PCI: setting up Xen PCI frontend stub
> [ Â Â0.006363] bio: create slab <bio-0> at 0
> [ Â Â0.006442] ACPI: Interpreter disabled.
> [ Â Â0.006487] xen_balloon: Initialising balloon driver with page order 0.
> [ Â Â0.006548] vgaarb: loaded
> [ Â Â0.006632] PCI: System does not support PCI
> [ Â Â0.006640] PCI: System does not support PCI
> [ Â Â0.006739] Switching to clocksource xen
> [ Â Â0.008000] pnp: PnP ACPI: disabled
> [ Â Â0.008000] PnPBIOS: Disabled
> [ Â Â0.008000] NET: Registered protocol family 2
> [ Â Â0.008000] IP route cache hash table entries: 32768 (order: 5, 131072 
> bytes)
> [ Â Â0.008000] TCP established hash table entries: 131072 (order: 8,
> 1048576 bytes)
> [ Â Â0.008000] TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
> [ Â Â0.008000] TCP: Hash tables configured (established 131072 bind 65536)
> [ Â Â0.008000] TCP reno registered
> [ Â Â0.008000] NET: Registered protocol family 1
> [ Â Â0.008000] Unpacking initramfs...
> [ Â Â0.060149] Freeing initrd memory: 20384k freed
> [ Â Â0.065656] platform rtc_cmos: registered platform RTC device (no
> PNP device found)
> [ Â Â0.164407] audit: initializing netlink socket (disabled)
> [ Â Â0.164428] type=2000 audit(1309517411.913:1): initialized
> [ Â Â0.169248] highmem bounce pool size: 64 pages
> [ Â Â0.169261] HugeTLB registered 2 MB page size, pre-allocated 0 pages
> [ Â Â0.170965] VFS: Disk quotas dquot_6.5.2
> [ Â Â0.171029] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> [ Â Â0.171161] msgmni has been set to 1406
> [ Â Â0.171400] alg: No test for stdrng (krng)
> [ Â Â0.171473] Block layer SCSI generic (bsg) driver version 0.4
> loaded (major 253)
> [ Â Â0.171484] io scheduler noop registered
> [ Â Â0.171490] io scheduler anticipatory registered
> [ Â Â0.171497] io scheduler deadline registered
> [ Â Â0.171541] io scheduler cfq registered (default)
> [ Â Â0.171713] isapnp: ISA Plug & Play support disabled
> [ Â Â0.175877] registering netback
> [ Â Â0.177865] Linux agpgart interface v0.103
> [ Â Â0.177989] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [ Â Â0.178263] PNP: No PS/2 controller found. Probing ports directly.
> [ Â Â0.179084] i8042.c: No controller found.
> [ Â Â0.179120] mice: PS/2 mouse device common for all mice
> [ Â Â0.179288] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
> [ Â Â0.179366] cpuidle: using governor ladder
> [ Â Â0.179373] cpuidle: using governor menu
> [ Â Â0.179382] No iBFT detected.
> [ Â Â0.179646] TCP cubic registered
> [ Â Â0.179814] NET: Registered protocol family 10
> [ Â Â0.180472] Mobile IPv6
> [ Â Â0.180480] NET: Registered protocol family 17
> [ Â Â0.180499] Using IPI No-Shortcut mode
> [ Â Â0.180597] registered taskstats version 1
> [ Â Â0.180613] XENBUS: Device with no driver: device/vbd/51714
> [ Â Â0.180620] XENBUS: Device with no driver: device/vbd/51713
> [ Â Â0.180626] XENBUS: Device with no driver: device/vbd/51728
> [ Â Â0.180633] XENBUS: Device with no driver: device/vif/0
> [ Â Â0.180639] XENBUS: Device with no driver: device/console/0
> [ Â Â0.180660] 
> /tmp/buildd/linux-2.6-2.6.32/debian/build/source_i386_xen/drivers/rtc/hctosys.c:
> unable to open rtc device (rtc0)
> [ Â Â0.180685] Initalizing network drop monitor service
> [ Â Â0.180726] Freeing unused kernel memory: 404k freed
> [ Â Â0.181523] Write protecting the kernel text: 2640k
> [ Â Â0.181776] Write protecting the kernel read-only data: 948k
> Loading, please wait...
> [ Â Â0.220445] udev[47]: starting version 164
> [ Â Â0.286743] Initialising Xen virtual ethernet driver.
> [ Â Â5.428092] XENBUS: Waiting for devices to initialise:
> 295s...290s...285s...280s...275s...270s...265s...260s...255s...250s...245s...240s...235s...230s...225s...220s...215s...210s...205s...200s...195s...190s...185s...180s...175s...170s...165s...160s...155s...150s...145s...140s...135s...130s...125s...udevd[47]:
> worker [54] unexpectedly returned with status 0x0100
>
> udevd[47]: worker [54] failed while handling '/devices/vbd-51713'
>
> udevd[47]: worker [55] unexpectedly returned with status 0x0100
>
> udevd[47]: worker [55] failed while handling '/devices/vbd-51714'
>
> udevd[47]: worker [56] unexpectedly returned with status 0x0100
>
> udevd[47]: worker [56] failed while handling '/devices/vbd-51728'
>
> Begin: Loading essential drivers ... done.
> Begin: Running /scripts/init-premount ... done.
> Begin: Mounting root file system ... Begin: Running /scripts/local-top ... 
> done.
> Begin: Waiting for root file system ...
> 120s...115s...110s...105s...100s...95s...90s...done.
> Gave up waiting for root device. ÂCommon problems:
> Â- Boot args (cat /proc/cmdline)
> Â - Check rootdelay= (did the system wait long enough?)
> Â - Check root= (did the system wait for the right device?)
> Â- Missing modules (cat /proc/modules; ls /dev)
> ALERT! Â/dev/xvda2 does not exist. ÂDropping to a shell!
>
>
> BusyBox v1.17.1 (Debian 1:1.17.1-8) built-in shell (ash)
> Enter 'help' for a list of built-in commands.
>
> /bin/sh: can't access tty; job control turned off
> (initramfs) 
> 85s...80s...75s...70s...65s...60s...55s...50s...45s...40s...35s...30s...25s...20s...15s...10s...5s...0s...
> [ Â300.332294] XENBUS: Timeout connecting to device: device/vbd/51714
> (local state 3, remote state 2)
> [ Â300.332418] XENBUS: Timeout connecting to device: device/vbd/51713
> (local state 3, remote state 2)
> [ Â300.332533] XENBUS: Timeout connecting to device: device/vbd/51728
> (local state 3, remote state 2)
>
> Also my xm info:
>
> host          : odin
> release        Â: 5.99.52
> version        Â: NetBSD 5.99.52 (XEN3_DOM0) #0: Wed Jun 22
> 15:02:28 CEST 2011
> royger@odin:/usr/obj/sys/arch/amd64/compile/XEN3_DOM0
> machine        Â: amd64
> nr_cpus        Â: 4
> nr_nodes        : 1
> cores_per_socket    : 4
> threads_per_core    : 1
> cpu_mhz        Â: 2128
> hw_caps        Â:
> bfebfbff:2c100800:00000000:00003f40:029ee3ff:00000000:00000001:00000000
> virt_caps       Â: hvm hvm_directio
> total_memory      : 16371
> free_memory      Â: 13079
> free_cpus       Â: 0
> xen_major       Â: 4
> xen_minor       Â: 1
> xen_extra       Â: .1
> xen_caps        : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64
> xen_scheduler     Â: credit
> xen_pagesize      : 4096
> platform_params    Â: virt_start=0xffff800000000000
> xen_changeset     Â: unavailable
> xen_commandline    Â: dom0_mem=512M dom0_max_vcpus=1 dom0_vcpus_pin
> console=com1 com1=115200,8n1
> cc_compiler      Â: gcc version 4.1.3 20080704 prerelease (NetBSD
> nb2 20081120)
> cc_compile_by     Â: root
> cc_compile_domain   Â:
> cc_compile_date    Â: Wed Jun 22 11:36:28 CEST 2011
> xend_config_format   : 4
>
> Well, I hope I haven't send too much, I'm sure some of this logs are
> useless, but since I don't know where the problem is I prefer to send
> everything I can. Hope someone can give me a hand with this one.
>
> Thanks and regards, Roger.
>

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