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Re: [Xen-users] /dev/sda2 does not exist. Dropping to a shell! (Dom0: Ubuntu 10.10, DomU: Ubuntu 10.10)


  • To: "Fajar A. Nugraha" <list@xxxxxxxxx>
  • From: Hitesh Khandelwal <hitesh.iitk@xxxxxxxxx>
  • Date: Thu, 10 Mar 2011 23:56:05 -0500
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 10 Mar 2011 20:57:52 -0800
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Thanks for your detailed reply. This is the configuration file I used for DomU:

kernel = '/boot/vmlinuz-2.6.32.27'
ramdisk = '/boot/initrd-2.6.32.27.img'
vcpus       = '1'
memory      = '512'
name        = 'cloud-vm07'
vif         = [ 'ip=128.10.130.192,mac=00:16:3E:AB:B1:FD,bridge=eth2' ]
disk        = [ 'file:/home/hkhande/xen-image/domains/cloud-vm07/disk.img,xvda1,w',
                  'file:/home/hkhande/xen-image/domains/cloud-vm07/swap.img,xvda2,w' ]
extra = "root=/dev/xvda1 ro"

I am still stuck on the same error(detailed log attached below). I unsuccessfully tried adding extra = 'console=hvc0' and extra = 'console=tty'. Log shows, xen detects disk correctly when using xvda "blkfront: xvda1: barriers enabled". But it also shows "XENBUS: Device with no driver: device/console/0". 

Thanks,
Hitesh

Detailed log:

$ xm create /home/hkhande/xen-image/cloud-vm07.cfg -c
Using config file "/home/hkhande/xen-image/cloud-vm07.cfg".
Started domain cloud-vm07 (id=7)
                                [    0.000000] Reserving virtual address space above 0xf5800000
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.32.27 (hkhande@cloud12) (gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5) ) #4 SMP Thu Feb 10 16:18:30 EST 2011
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   NSC Geode by NSC
[    0.000000]   Cyrix CyrixInstead
[    0.000000]   Centaur CentaurHauls
[    0.000000]   Transmeta GenuineTMx86
[    0.000000]   Transmeta TransmetaCPU
[    0.000000]   UMC UMC UMC UMC
[    0.000000] ACPI in unprivileged domain disabled
[    0.000000] released 0 pages of unused memory
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  Xen: 0000000000000000 - 00000000000a0000 (usable)
[    0.000000]  Xen: 00000000000a0000 - 0000000000100000 (reserved)
[    0.000000]  Xen: 0000000000100000 - 0000000020800000 (usable)
[    0.000000] DMI not present or invalid.
[    0.000000] last_pfn = 0x20800 max_arch_pfn = 0x1000000
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] modified physical RAM map:
[    0.000000]  modified: 0000000000000000 - 0000000000002000 (usable)
[    0.000000]  modified: 0000000000002000 - 0000000000006000 (reserved)
[    0.000000]  modified: 0000000000006000 - 00000000000a0000 (usable)
[    0.000000]  modified: 00000000000a0000 - 0000000000100000 (reserved)
[    0.000000]  modified: 0000000000100000 - 0000000020800000 (usable)
[    0.000000] init_memory_mapping: 0000000000000000-0000000020800000
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] RAMDISK: 01a6f000 - 01f43000
[    0.000000] 0MB HIGHMEM available.
[    0.000000] 520MB LOWMEM available.
[    0.000000]   mapped low ram: 0 - 20800000
[    0.000000]   low ram: 0 - 20800000
[    0.000000]   node 0 low ram: 00000000 - 20800000
[    0.000000]   node 0 bootmap 00007000 - 0000b100
[    0.000000] (11 early reservations) ==> bootmem [0000000000 - 0020800000]
[    0.000000]   #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 0000001000]
[    0.000000]   #1 [0001fc6000 - 0001fda000]   XEN PAGETABLES ==> [0001fc6000 - 0001fda000]
[    0.000000]   #2 [0000001000 - 0000002000]    EX TRAMPOLINE ==> [0000001000 - 0000002000]
[    0.000000]   #3 [0000006000 - 0000007000]       TRAMPOLINE ==> [0000006000 - 0000007000]
[    0.000000]   #4 [0001000000 - 00018fe7e0]    TEXT DATA BSS ==> [0001000000 - 00018fe7e0]
[    0.000000]   #5 [0001a6f000 - 0001f43000]          RAMDISK ==> [0001a6f000 - 0001f43000]
[    0.000000]   #6 [0001f43000 - 0001fc6000]   XEN START INFO ==> [0001f43000 - 0001fc6000]
[    0.000000]   #7 [0020000000 - 0020800000]        XEN EXTRA ==> [0020000000 - 0020800000]
[    0.000000]   #8 [00018ff000 - 000190c000]              BRK ==> [00018ff000 - 000190c000]
[    0.000000]   #9 [0000100000 - 00001ef000]          PGTABLE ==> [0000100000 - 00001ef000]
[    0.000000]   #10 [0000007000 - 000000c000]          BOOTMAP ==> [0000007000 - 000000c000]
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000000 -> 0x00001000
[    0.000000]   Normal   0x00001000 -> 0x00020800
[    0.000000]   HighMem  0x00020800 -> 0x00020800
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[3] active PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00000002
[    0.000000]     0: 0x00000006 -> 0x000000a0
[    0.000000]     0: 0x00000100 -> 0x00020800
[    0.000000] Using APIC driver default
[    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic"
[    0.000000] APIC: disable apic facility
[    0.000000] PM: Registered nosave memory: 0000000000002000 - 0000000000006000
[    0.000000] PM: Registered nosave memory: 00000000000a0000 - 0000000000100000
[    0.000000] Allocating PCI resources starting at 20800000 (gap: 20800000:df800000)
[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.0.1 (preserve-AD)
[    0.000000] NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] PERCPU: Embedded 15 pages/cpu @c23ee000 s37080 r0 d24360 u65536
[    0.000000] pcpu-alloc: s37080 r0 d24360 u65536 alloc=16*4096
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 131980
[    0.000000] Kernel command line: root=/dev/xvda1 ro
[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Enabling fast FPU save and restore... done.
[    0.000000] Enabling unmasked SIMD FPU exception support... done.
[    0.000000] Initializing CPU#0
[    0.000000] Initializing HighMem for node 0 (00000000:00000000)
[    0.000000] Memory: 502808k/532480k available (5048k kernel code, 29012k reserved, 2956k data, 464k init, 0k highmem)
[    0.000000] virtual kernel memory layout:
[    0.000000]     fixmap  : 0xf571d000 - 0xf57ff000   ( 904 kB)
[    0.000000]     pkmap   : 0xf5200000 - 0xf5400000   (2048 kB)
[    0.000000]     vmalloc : 0xe1000000 - 0xf51fe000   ( 321 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xe0800000   ( 520 MB)
[    0.000000]       .init : 0xc17d2000 - 0xc1846000   ( 464 kB)
[    0.000000]       .data : 0xc14ee376 - 0xc17d175c   (2956 kB)
[    0.000000]       .text : 0xc1000000 - 0xc14ee376   (5048 kB)
[    0.000000] SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS:2304 nr_irqs:512
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [hvc0] enabled
[    0.000000] installing Xen timer for CPU 0
[    0.000000] Detected 2327.530 MHz processor.
[    0.000999] Calibrating delay loop (skipped), value calculated using timer frequency.. 4655.06 BogoMIPS (lpj=2327530)
[    0.000999] Security Framework initialized
[    0.000999] SELinux:  Initializing.
[    0.000999] Mount-cache hash table entries: 512
[    0.000999] Initializing cgroup subsys ns
[    0.000999] Initializing cgroup subsys cpuacct
[    0.000999] Initializing cgroup subsys freezer
[    0.000999] CPU: L1 I cache: 32K, L1 D cache: 32K
[    0.000999] CPU: L2 cache: 6144K
[    0.000999] CPU: Unsupported number of siblings 4
[    0.000999] Performance Events: unsupported p6 CPU model 23 no PMU driver, software events only.
[    0.001709] SMP alternatives: switching to UP code
[    0.002667] Freeing SMP alternatives: 21k freed
[    0.003026] Brought up 1 CPUs
[    0.003841] Grant table initialized
[    0.023747] Time: 165:165:165  Date: 165/165/65
[    0.023825] NET: Registered protocol family 16
[    0.024996] PCI: setting up Xen PCI frontend stub
[    0.044214] bio: create slab <bio-0> at 0
[    0.044424] ACPI: Interpreter disabled.
[    0.044654] xen_balloon: Initialising balloon driver with page order 0.
[    0.044808] last_pfn = 0x20800 max_arch_pfn = 0x1000000
[    0.045178] vgaarb: loaded
[    0.045532] SCSI subsystem initialized
[    0.046184] usbcore: registered new interface driver usbfs
[    0.046273] usbcore: registered new interface driver hub
[    0.046384] usbcore: registered new device driver usb
[    0.046941] PCI: System does not support PCI
[    0.046950] PCI: System does not support PCI
[    0.047488] cfg80211: Using static regulatory domain info
[    0.047497] cfg80211: Regulatory domain: US
[    0.047504]  (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[    0.047514]  (2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2700 mBm)
[    0.047523]  (5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.047532]  (5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.047541]  (5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.047550]  (5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.047559]  (5735000 KHz - 5835000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
[    0.047576] cfg80211: Calling CRDA for country: US
[    0.047657] NetLabel: Initializing
[    0.047992] NetLabel:  domain hash size = 128
[    0.047992] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.047992] NetLabel:  unlabeled traffic allowed by default
[    0.048339] Switching to clocksource xen
[    0.052783] pnp: PnP ACPI: disabled
[    0.054122] NET: Registered protocol family 2
[    0.054199] IP route cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.054441] TCP established hash table entries: 32768 (order: 6, 262144 bytes)
[    0.054569] TCP bind hash table entries: 32768 (order: 6, 262144 bytes)
[    0.054689] TCP: Hash tables configured (established 32768 bind 32768)
[    0.054704] TCP reno registered
[    0.054788] NET: Registered protocol family 1
[    0.054908] RPC: Registered udp transport module.
[    0.054918] RPC: Registered tcp transport module.
[    0.054926] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.054996] Trying to unpack rootfs image as initramfs...
[    0.062727] Freeing initrd memory: 4944k freed
[    0.064711] kvm: no hardware support
[    0.064732] has_svm: not amd
[    0.064738] kvm: no hardware support
[    0.065187] platform rtc_cmos: registered platform RTC device (no PNP device found)
[    0.066053] microcode: no support for this CPU vendor
[    0.066069] Scanning for low memory corruption every 60 seconds
[    0.066652] audit: initializing netlink socket (disabled)
[    0.066681] type=2000 audit(1299816305.332:1): initialized
[    0.080228] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.085543] VFS: Disk quotas dquot_6.5.2
[    0.085665] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.087947] msgmni has been set to 992
[    0.088955] alg: No test for stdrng (krng)
[    0.089248] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    0.089260] io scheduler noop registered
[    0.089267] io scheduler anticipatory registered
[    0.089275] io scheduler deadline registered
[    0.089391] io scheduler cfq registered (default)
[    0.089645] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.094312] Event-channel device installed.
[    0.099563] registering netback
[    0.108167] Non-volatile memory driver v1.3
[    0.108179] Linux agpgart interface v0.103
[    0.108432] [drm] Initialized drm 1.1.0 20060810
[    0.108446] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.113145] brd: module loaded
[    0.114923] loop: module loaded
[    0.136811] input: Macintosh mouse button emulation as /devices/virtual/input/input0
[    0.137988] Intel(R) PRO/1000 Network Driver - version 7.3.21-k5-NAPI
[    0.137998] Copyright (c) 1999-2006 Intel Corporation.
[    0.138137] e1000e: Intel(R) PRO/1000 Network Driver - 1.0.2-k2
[    0.138147] e1000e: Copyright (c) 1999-2008 Intel Corporation.
[    0.138347] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[    0.138357] e100: Copyright(c) 1999-2006 Intel Corporation
[    0.138605] sky2 driver version 1.25
[    0.138776] Initialising Xen virtual ethernet driver.
[    0.150638] blkfront: xvda1: barriers enabled (tag)
[    0.155734] console [netcon0] enabled
[    0.155741] netconsole: network logging started
[    0.156049] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.156150] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.156246] uhci_hcd: USB Universal Host Controller Interface driver
[    0.156516] usbcore: registered new interface driver usblp
[    0.156526] Initializing USB Mass Storage driver...
[    0.156616] usbcore: registered new interface driver usb-storage
[    0.156626] USB Mass Storage support registered.
[    0.156720] usbcore: registered new interface driver libusual
[    0.157132] PNP: No PS/2 controller found. Probing ports directly.
[    0.158006] i8042.c: No controller found.
[    0.249410] mice: PS/2 mouse device common for all mice
[    0.250076] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
[    0.250867] device-mapper: ioctl: 4.15.0-ioctl (2009-04-01) initialised: dm-devel@xxxxxxxxxx
[    0.251156] cpuidle: using governor ladder
[    0.251165] cpuidle: using governor menu
[    0.254131] usbcore: registered new interface driver hiddev
[    0.254228] usbcore: registered new interface driver usbhid
[    0.254241] usbhid: v2.6:USB HID core driver
[    0.254379] Advanced Linux Sound Architecture Driver Version 1.0.21.
[    0.257390] ALSA device list:
[    0.257399]   No soundcards found.
[    0.257433] Netfilter messages via NETLINK v0.30.
[    0.257466] nf_conntrack version 0.5.0 (8192 buckets, 32768 max)
[    0.257842] ctnetlink v0.93: registering with nfnetlink.
[    0.258385] ip_tables: (C) 2000-2006 Netfilter Core Team
[    0.258421] TCP cubic registered
[    0.258429] Initializing XFRM netlink socket
[    0.259203] NET: Registered protocol family 10
[    0.260125] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    0.260184] IPv6 over IPv4 tunneling driver
[    0.260838] NET: Registered protocol family 17
[    0.260899] Using IPI No-Shortcut mode
[    0.261295] registered taskstats version 1
[    0.263557] blkfront: xvda2: barriers enabled (tag)
[    0.361037] XENBUS: Device with no driver: device/console/0
[    0.361067]   Magic number: 1:252:3141
[    0.361153] Freeing unused kernel memory: 464k freed
[    0.362967] Write protecting the kernel text: 5052k
[    0.363759] Write protecting the kernel read-only data: 2428k
Loading, please wait...
mount: mounting none on /dev failed: No such device
W: devtmpfs not available, falling back to tmpfs for /dev
Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... done.
[    5.573302] EXT3-fs: INFO: recovery required on readonly filesystem.
[    5.573326] EXT3-fs: write access will be enabled during recovery.
[    5.575439] kjournald starting.  Commit interval 5 seconds
[    5.575464] EXT3-fs: recovery complete.
[    5.575754] EXT3-fs: mounted filesystem with writeback data mode.
Begin: Running /scripts/local-bottom ... done.
done.
Begin: Running /scripts/init-bottom ... done.
init: ureadahead main process (803) terminated with status 5


On Thu, Mar 10, 2011 at 8:21 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
On Fri, Mar 11, 2011 at 7:35 AM, Hitesh Khandelwal
<hitesh.iitk@xxxxxxxxx> wrote:
> Replied inline:
> On Wed, Mar 9, 2011 at 9:33 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
>>
>> On Thu, Mar 10, 2011 at 7:34 AM, Hitesh Khandelwal
>> <hitesh.iitk@xxxxxxxxx> wrote:
>> > root        = '/dev/sda2 ro'
>>
>> For starters, change that to /dev/xvda2
>>
>> > disk        = [
>> >
>> >  'file:/home/hkhande/xen-image/domains/cloud-vm06/disk.img,sda2,w',
>>
>> ... and here as well. Though newer kernel version will silently change
>> sd* to xvd*, sometimes the mapping seems inconsistent (sda -> xvde)
>
>
> As I already mentioned in my earlier post, I tried xvda as well. This is the
> error I received:
> Loading, please wait...

You DO know that those limited error message is almost useless, right?
You need to remove "quiet" and "rhgb" (if present in kernel agrs) and
add "console=hvc0" (if you also have vfb enabled) to get informative
boot message on domU's xen console. Logs like these one are
particularly useful

[    0.181537] XENBUS: Device with no driver: device/vbd/51712
[    0.181543] XENBUS: Device with no driver: device/vif/0
[    0.181548] XENBUS: Device with no driver: device/console/0

... which shows that domU detects some devices

[    0.388665] blkfront device/vbd/51712 num-ring-pages 1 nr_ents 32.
[    0.401714] blkfront: sda: barriers enabled
[    0.402322]  sda: sda1 sda2

... which shows that the disk was mapped as xvda (vbd/51712), but the
kernel use "sda" as device name

or

[    0.175140] XENBUS: Device with no driver: device/vbd/51712
[    0.811357] blkfront: xvda: barriers enabled
[    0.812448]  xvda: xvda1 xvda2 xvda3

... which shows that the disk was mapped as xvda (vbd/51712), and the
kernel use "xvda" as device name

It's useful because (for instance) in Ubuntu Maverick's
linux-image-2.6.35-25-generic detects the disk sda (even though I use
xvda in domU config file), while Lucid's linux-image-2.6.32-29-virtual
detects it as xvda.

... or you could just use "root=UUID=...." or "root=LABEL=..." and
don't care about sda/xvda mappings.


Also, I think it's better to use "extra" instead of "root" on Xen
config file, so you can just copy the kernel command line from
grub/grub2's menu.lst/grub.cfg. Depending on what you currently have
on grub.cfg, the "extra" line should look like

extra=" root=LABEL=ROOT ro"

or

extra=" root=UUID=9aab45dc-4bcf-426e-947c-c027db28b098 ro"

> mount: mounting none on /dev failed: No such device
> W: devtmpfs not available, falling back to tmpfs for /dev
> Begin: Loading essential drivers ... done.
> Begin: Running /scripts/init-premount ... done.
> Begin: Mounting root file system ... Begin: Running /scripts/local-top ...
> done.
> Begin: Running /scripts/local-premount ... done.
> [    5.572796] kjournald starting.  Commit interval 5 seconds
> [    5.572824] EXT3-fs: mounted filesystem with writeback data mode.
> Begin: Running /scripts/local-bottom ... done.
> done.
> Begin: Running /scripts/init-bottom ... done.
> init: ureadahead main process (803) terminated with status 5

This actually look like a complete boot process. You just don't have
the login prompt. Try removing "xencons=hvc" from your "extra" line
(do you even have that in your grub.cfg?).

I use something like this to detect whether hvc0 or ttyS0 is
available, and spawn a login prompt there

#=======================================================
# cat /etc/init/hvc0.conf
# hvc0 - getty
#
# This service maintains a getty on hvc0 from the point the system is
# started until it is shut down again.

start on stopped rc RUNLEVEL=[2345]
stop on runlevel [!2345]

pre-start script
   test -c /dev/hvc0 && echo >> /dev/hvc0 || { stop; exit 0; }
end script

respawn
exec /sbin/getty -8 38400 hvc0
#=======================================================

for ttyS0 just create a new file, changing the file name and content
replacing "hvc0" with "tty0". This way whatever console I have (hvc0
when booting PV, ttyS0 when booting HVM) I'll be able to access it.

> I meant, I want to use the same xen kernel I compiled for running Dom0.
> because this
> patch: http://lists.xensource.com/archives/html/xen-devel/2010-10/msg01261.html
> is still absent in ubuntu stock kernels. That patch is part of xen kernel I
> compiled for Dom0, hence want to use the same kernel for DomU as well. Can
> you please elaborate how to use Dom0 kernel and initramfs for booting DomU?

The easiest way? Just install the compiled kernel inside domU. Use
make-kpkg to make your life easier.

>
>>
>> > I also modified /etc/initramfs-tools/modules in Dom0 to include
>> > scsi_mod, sd_mod, blkbk modules, followed by update-initramfs.
>>
>> ... as shown here.
>>
>> blkbk is xen block backend device driver, needed by dom0 but not
>> needed by domU. domU needs xen_blkfront and xen_netfront.
>>

... or do what you already do, but make sure xen_blkfront is also
loaded. Although from your last log it seems the disk is already
detected correctly when you use xvda. You're just missing the login
prompt.

--
Fajar

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