Re: [Xen-devel] the /dev/xvda can not be mounted and read/write when using xl create domU

[duqi <duqi_2009@xxxxxxx>]

At 2014-04-16 11:29:54, "duqi" <duqi_2009@xxxxxxx> wrote:
>Hello everyone,
>
>I have tried to boot the domU folow the below instrctions:
>The domU kernel that I used is from 
>https://github.com/linux-sunxi/linux-sunxi.git  and the 'sunxi-devel' branch. 
>I  have compiled the ramdisk with the domu kernel to boot the domu.
>
>When I xl console the domU , I tried to mount the /dev/xvda to the /mnt and I 
>met this error:
># mount /dev/xvda /mnt
>[  681.934232] end_request: I/O error, dev xvda, sector 2
>[  681.934401] EXT3-fs (xvda): error: unable to read superblock
>[  681.947103] end_request: I/O error, dev xvda, sector 2
>[  681.947244] EXT2-fs (xvda): error: unable to read superblock
>[  681.967089] end_request: I/O error, dev xvda, sector 2
>[  681.967226] EXT4-fs (xvda): unable to read superblock
>mount: mounting /dev/xvda on /mnt failed: Invalid argument
>#
>
>Then I tried "# dd if=/dev/zero of=/dev/xvda bs=1 count=1000 seek=10000" to 
>test the read and write of /dev/xvda, it also met error:
>[  632.851166] end_request: I/O error, dev xvda, sector 16
>dd: writing '/dev/xvda': Input/output error
>1+0 records in
>0+0 records out
>
>(2) the domu_all.cfg is here:
>root@linaro-alip:~# cat domu_all.cfg 
>kernel = "/root/zImage" 
>memory = "64" 
>name = "dom11" 
>vcpus = 1 
>serial="pty"
>root="/dev/xvda" 
>extra = "4 console=hvc0,xencons=tty"
>disk = [ 'phy:/dev/loop2,xvda,w' ]
>vif=[ 'mac=00:16:3e:56:af:69,bridge=xenbr0,type=netfront', ]
>
>Then I boot the domU follow the instructions:
>losetup /dev/loop2 /root/domU/rootfs.img
>xl -vvv create domu_all.cfg
>
>
>Add some information ： I want to use the raring rootfs as the rootfs of domu, 
>and the /dev/xvda as the root device of domu, now I compiled the kernel with 
>ramdisk for debug.
>
>Could you give me some advices ? Thank you very much.
>
>Here is the kernel dump of domU:
>
>root@linaro-alip:~# xl console dom11
>[    0.000000] Booting Linux on physical CPU 0x0
>[    0.000000] Linux version 3.15.0-rc1-128773-gf7b9c0f-dirty 
>(root@Lenovo-G480) (gcc version 4.8.2 20131014 (prerelease) (cross4
>[    0.000000] CPU: ARMv7 Processor [410fc074] revision 4 (ARMv7), cr=10c5387d
>[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing 
>instruction cache
>[    0.000000] Machine model: XENVM-4.4
>[    0.000000] cma: CMA: failed to reserve 64 MiB
>[    0.000000] Memory policy: Data cache writealloc
>[    0.000000] psci: probing function IDs from device-tree
>[    0.000000] PERCPU: Embedded 8 pages/cpu @c3f6f000 s8896 r8192 d15680 u32768
>[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total 
>pages: 16256
>[    0.000000] Kernel command line: root=/dev/xvda 4 console=hvc0,xencons=tty
>[    0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
>[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
>[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
>[    0.000000] Memory: 52384K/65536K available (6317K kernel code, 787K 
>rwdata, 2416K rodata, 2692K init, 292K bss, 13152K reser)
>[    0.000000] Virtual kernel memory layout:
>[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
>[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
>[    0.000000]     vmalloc : 0xc4800000 - 0xff000000   ( 936 MB)
>[    0.000000]     lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
>[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
>[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
>[    0.000000]       .text : 0xc0208000 - 0xc0a8f994   (8735 kB)
>[    0.000000]       .init : 0xc0a90000 - 0xc0d312c0   (2693 kB)
>[    0.000000]       .data : 0xc0d32000 - 0xc0df6ea0   ( 788 kB)
>[    0.000000]        .bss : 0xc0df6ea8 - 0xc0e40110   ( 293 kB)
>[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
>[    0.000000] Hierarchical RCU implementation.
>[    0.000000]  RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
>[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
>[    0.000000] NR_IRQS:16 nr_irqs:16 16
>[    0.000000] Architected cp15 timer(s) running at 24.00MHz (virt).
>[    0.000008] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps every 
>2863311519744ns
>[    0.000016] Switching to timer-based delay loop
>[    0.000152] Console: colour dummy device 80x30
>[    0.000181] Calibrating delay loop (skipped), value calculated using timer 
>frequency.. 48.00 BogoMIPS (lpj=240000)
>[    0.000194] pid_max: default: 32768 minimum: 301
>[    0.000321] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
>[    0.000332] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
>[    0.000879] CPU: Testing write buffer coherency: ok
>[    0.001145] /cpus/cpu@0 missing clock-frequency property
>[    0.001163] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
>[    0.001205] Xen 4.4 support found, events_irq=31 gnttab_frame=0xb0000000
>[    0.001285] xen:grant_table: Grant tables using version 1 layout
>[    0.001332] Grant table initialized
>[    0.001416] xen:events: Using FIFO-based ABI
>[    0.001439] Xen: initializing cpu0
>[    0.001553] Setting up static identity map for 0x807fe120 - 0x807fe1b8
>[    0.002319] Brought up 1 CPUs
>[    0.002332] SMP: Total of 1 processors activated.
>[    0.002341] CPU: All CPU(s) started in SVC mode.
>[    0.002957] devtmpfs: initialized
>[    0.003728] VFP support v0.3: implementor 41 architecture 2 part 30 variant 
>7 rev 4
>[    0.003991] pinctrl core: initialized pinctrl subsystem
>[    0.004395] regulator-dummy: no parameters
>[    0.005068] NET: Registered protocol family 16
>[    0.005187] DMA: failed to allocate 256 KiB pool for atomic coherent 
>allocation
>[    0.007939] No ATAGs?
>[    0.008417] Serial: AMBA PL011 UART driver
>[    0.016931] edma-dma-engine edma-dma-engine.0: Can't allocate PaRAM dummy 
>slot
>[    0.016969] edma-dma-engine: probe of edma-dma-engine.0 failed with error -5
>[    0.017090] xen:balloon: Initialising balloon driver
>[    0.022741] vgaarb: loaded
>[    0.023384] SCSI subsystem initialized
>[    0.024138] usbcore: registered new interface driver usbfs
>[    0.024224] usbcore: registered new interface driver hub
>[    0.024584] usbcore: registered new device driver usb
>[    0.025051] Linux video capture interface: v2.00
>[    0.025101] pps_core: LinuxPPS API ver. 1 registered
>[    0.025111] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo 
>Giometti <giometti@xxxxxxxx>
>[    0.025146] PTP clock support registered
>[    0.025204] EDAC MC: Ver: 3.0.0
>[    0.026062] Advanced Linux Sound Architecture Driver Initialized.
>[    0.027270] Switched to clocksource arch_sys_counter
>[    0.038473] NET: Registered protocol family 2
>[    0.039042] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
>[    0.039076] TCP bind hash table entries: 1024 (order: 1, 8192 bytes)
>[    0.039100] TCP: Hash tables configured (established 1024 bind 1024)
>[    0.039157] TCP: reno registered
>[    0.039172] UDP hash table entries: 256 (order: 1, 8192 bytes)
>[    0.039206] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
>[    0.039376] NET: Registered protocol family 1
>[    0.039780] RPC: Registered named UNIX socket transport module.
>[    0.039795] RPC: Registered udp transport module.
>[    0.039802] RPC: Registered tcp transport module.
>[    0.039809] RPC: Registered tcp NFSv4.1 backchannel transport module.
>[    0.184584] futex hash table entries: 256 (order: 2, 16384 bytes)
>[    0.196325] squashfs: version 4.0 (2009/01/31) Phillip Lougher
>[    0.197108] NFS: Registering the id_resolver key type
>[    0.197176] Key type id_resolver registered
>[    0.197185] Key type id_legacy registered
>[    0.197234] msgmni has been set to 102
>[    0.197970] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
>249)
>[    0.197986] io scheduler noop registered
>[    0.197994] io scheduler deadline registered
>[    0.198189] io scheduler cfq registered (default)
>[    0.260058] console [hvc0] enabled
>[    0.260155] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
>[    0.261940] msm_serial: driver initialized
>[    0.262148] STMicroelectronics ASC driver initialized
>[    0.262568] serial: Freescale lpuart driver
>[    0.262771] [drm] Initialized drm 1.1.0 20060810
>[    0.267247] loop: module loaded
>[    0.283758] xen_netfront: Initialising Xen virtual ethernet driver
>[    0.299796] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet 
>driver
>[    0.299970] usbcore: registered new interface driver pegasus
>[    0.300080] usbcore: registered new interface driver asix
>[    0.300152] usbcore: registered new interface driver ax88179_178a
>[    0.300220] usbcore: registered new interface driver cdc_ether
>[    0.300302] usbcore: registered new interface driver smsc75xx
>[    0.300384] usbcore: registered new interface driver smsc95xx
>[    0.300447] usbcore: registered new interface driver net1080
>[    0.300511] usbcore: registered new interface driver cdc_subset
>[    0.300626] usbcore: registered new interface driver zaurus
>[    0.300787] usbcore: registered new interface driver cdc_ncm
>[    0.300841] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>[    0.300865] ehci-pci: EHCI PCI platform driver
>[    0.300953] ehci-platform: EHCI generic platform driver
>[    0.301107] ehci-omap: OMAP-EHCI Host Controller driver
>[    0.301196] ehci-orion: EHCI orion driver
>[    0.301271] SPEAr-ehci: EHCI SPEAr driver
>[    0.301342] tegra-ehci: Tegra EHCI driver
>[    0.301803] usbcore: registered new interface driver usb-storage
>[    0.303013] mousedev: PS/2 mouse device common for all mice
>[    0.304514] i2c /dev entries driver
>[    0.304994] usbcore: registered new interface driver uvcvideo
>[    0.305020] USB Video Class driver (1.1.1)
>[    0.305034] gspca_main: v2.14.0 registered
>[    0.305669] xen_wdt: Xen WatchDog Timer Driver v0.01
>[    0.306421] xen_wdt: initialized (timeout=60s, nowayout=0)
>[    0.307004] sdhci: Secure Digital Host Controller Interface driver
>[    0.307036] sdhci: Copyright(c) Pierre Ossman
>[    0.307504] sdhci-pltfm: SDHCI platform and OF driver helper
>[    0.307947] usbcore: registered new interface driver usbhid
>[    0.307973] usbhid: USB HID core driver
>[    0.311044] TCP: cubic registered
>[    0.311084] NET: Registered protocol family 17
>[    0.311387] Key type dns_resolver registered
>[    0.311502] ThumbEE CPU extension supported.
>[    0.323687] Registering SWP/SWPB emulation handler
>[    0.329080] blkfront: xvda: flush diskcache: enabled; persistent grants: 
>enabled; indirect descriptors: enabled;
>[    0.347192]  xvda: unknown partition table
>[    0.367730] Setting capacity to 10240
>[    0.367787] xvda: detected capacity change from 0 to 5242880
>[    0.417924] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
>[    0.418071] ALSA device list:
>[    0.418093]   No soundcards found.
>[    0.421706] Freeing unused kernel memory: 2692K (c0a90000 - c0d31000)
>
>
>duqi.


Hi, everyone
If I don't compile the ramdisk into the domU kernel ,the domU kernel dump is 
here:

root@linaro-alip:~# xl console 18
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 3.15.0-rc1-128773-gf7b9c0f-dirty 
(root@Lenovo-G480) (gcc version 4.8.2 20131014 (prerelease) (cross4
[    0.000000] CPU: ARMv7 Processor [410fc074] revision 4 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing 
instruction cache
[    0.000000] Machine model: XENVM-4.4
[    0.000000] cma: CMA: failed to reserve 64 MiB
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] psci: probing function IDs from device-tree
[    0.000000] PERCPU: Embedded 8 pages/cpu @c3f6f000 s8896 r8192 d15680 u32768
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total 
pages: 16256
[    0.000000] Kernel command line: root=/dev/xvda2 console=hvc0,xencons=tty
[    0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Memory: 54552K/65536K available (6330K kernel code, 787K rwdata, 
2420K rodata, 504K init, 292K bss, 10984K reserv)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xc4800000 - 0xff000000   ( 936 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0208000 - 0xc0a93aa4   (8751 kB)
[    0.000000]       .init : 0xc0a94000 - 0xc0b122c0   ( 505 kB)
[    0.000000]       .data : 0xc0b14000 - 0xc0bd8ee0   ( 788 kB)
[    0.000000]        .bss : 0xc0bd8ee8 - 0xc0c22150   ( 293 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000]  RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] Architected cp15 timer(s) running at 24.00MHz (virt).
[    0.000009] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps every 
2863311519744ns
[    0.000017] Switching to timer-based delay loop
[    0.000155] Console: colour dummy device 80x30
[    0.000184] Calibrating delay loop (skipped), value calculated using timer 
frequency.. 48.00 BogoMIPS (lpj=240000)
[    0.000198] pid_max: default: 32768 minimum: 301
[    0.000324] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000335] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000882] CPU: Testing write buffer coherency: ok
[    0.001138] /cpus/cpu@0 missing clock-frequency property
[    0.001158] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.001202] Xen 4.4 support found, events_irq=31 gnttab_frame=0xb0000000
[    0.001283] xen:grant_table: Grant tables using version 1 layout
[    0.001329] Grant table initialized
[    0.001416] xen:events: Using FIFO-based ABI
[    0.001438] Xen: initializing cpu0
[    0.001549] Setting up static identity map for 0x80800f68 - 0x80801000
[    0.002309] Brought up 1 CPUs
[    0.002325] SMP: Total of 1 processors activated.
[    0.002334] CPU: All CPU(s) started in SVC mode.
[    0.002917] devtmpfs: initialized
[    0.003679] VFP support v0.3: implementor 41 architecture 2 part 30 variant 
7 rev 4
[    0.003950] pinctrl core: initialized pinctrl subsystem
[    0.004355] regulator-dummy: no parameters
[    0.005027] NET: Registered protocol family 16
[    0.005137] DMA: failed to allocate 256 KiB pool for atomic coherent 
allocation
[    0.007911] No ATAGs?
[    0.008383] Serial: AMBA PL011 UART driver
[    0.017039] edma-dma-engine edma-dma-engine.0: Can't allocate PaRAM dummy 
slot
[    0.017075] edma-dma-engine: probe of edma-dma-engine.0 failed with error -5
[    0.017196] xen:balloon: Initialising balloon driver
[    0.022586] vgaarb: loaded
[    0.023244] SCSI subsystem initialized
[    0.023981] usbcore: registered new interface driver usbfs
[    0.024063] usbcore: registered new interface driver hub
[    0.024390] usbcore: registered new device driver usb
[    0.024903] Linux video capture interface: v2.00
[    0.024952] pps_core: LinuxPPS API ver. 1 registered
[    0.024961] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo 
Giometti <giometti@xxxxxxxx>
[    0.024986] PTP clock support registered
[    0.025043] EDAC MC: Ver: 3.0.0
[    0.025918] Advanced Linux Sound Architecture Driver Initialized.
[    0.027165] Switched to clocksource arch_sys_counter
[    0.038556] NET: Registered protocol family 2
[    0.039089] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.039120] TCP bind hash table entries: 1024 (order: 1, 8192 bytes)
[    0.039144] TCP: Hash tables configured (established 1024 bind 1024)
[    0.039200] TCP: reno registered
[    0.039215] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.039248] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.039422] NET: Registered protocol family 1
[    0.039846] RPC: Registered named UNIX socket transport module.
[    0.039861] RPC: Registered udp transport module.
[    0.039868] RPC: Registered tcp transport module.
[    0.039875] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.041262] futex hash table entries: 256 (order: 2, 16384 bytes)
[    0.053139] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.053939] NFS: Registering the id_resolver key type
[    0.054015] Key type id_resolver registered
[    0.054025] Key type id_legacy registered
[    0.054076] msgmni has been set to 106
[    0.054683] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
249)
[    0.054697] io scheduler noop registered
[    0.054704] io scheduler deadline registered
[    0.054898] io scheduler cfq registered (default)
[    0.116631] console [hvc0] enabled
[    0.116730] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.118533] msm_serial: driver initialized
[    0.118743] STMicroelectronics ASC driver initialized
[    0.119124] serial: Freescale lpuart driver
[    0.119326] [drm] Initialized drm 1.1.0 20060810
[    0.123881] loop: module loaded
[    0.146829] xen_netfront: Initialising Xen virtual ethernet driver
[    0.162733] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet 
driver
[    0.162861] usbcore: registered new interface driver pegasus
[    0.162976] usbcore: registered new interface driver asix
[    0.163043] usbcore: registered new interface driver ax88179_178a
[    0.163107] usbcore: registered new interface driver cdc_ether
[    0.163190] usbcore: registered new interface driver smsc75xx
[    0.163271] usbcore: registered new interface driver smsc95xx
[    0.163334] usbcore: registered new interface driver net1080
[    0.163395] usbcore: registered new interface driver cdc_subset
[    0.163458] usbcore: registered new interface driver zaurus
[    0.163655] usbcore: registered new interface driver cdc_ncm
[    0.163712] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.163734] ehci-pci: EHCI PCI platform driver
[    0.163824] ehci-platform: EHCI generic platform driver
[    0.163978] ehci-omap: OMAP-EHCI Host Controller driver
[    0.164063] ehci-orion: EHCI orion driver
[    0.164136] SPEAr-ehci: EHCI SPEAr driver
[    0.164210] tegra-ehci: Tegra EHCI driver
[    0.164681] usbcore: registered new interface driver usb-storage
[    0.165891] mousedev: PS/2 mouse device common for all mice
[    0.167536] i2c /dev entries driver
[    0.168039] usbcore: registered new interface driver uvcvideo
[    0.168067] USB Video Class driver (1.1.1)
[    0.168081] gspca_main: v2.14.0 registered
[    0.168692] xen_wdt: Xen WatchDog Timer Driver v0.01
[    0.169506] xen_wdt: initialized (timeout=60s, nowayout=0)
[    0.170077] sdhci: Secure Digital Host Controller Interface driver
[    0.170105] sdhci: Copyright(c) Pierre Ossman
[    0.170427] sdhci-pltfm: SDHCI platform and OF driver helper
[    0.170837] usbcore: registered new interface driver usbhid
[    0.170863] usbhid: USB HID core driver
[    0.173846] TCP: cubic registered
[    0.173953] NET: Registered protocol family 17
[    0.174277] Key type dns_resolver registered
[    0.174383] ThumbEE CPU extension supported.
[    0.182340] Registering SWP/SWPB emulation handler
[    0.191431] blkfront: xvda: flush diskcache: enabled; persistent grants: 
enabled; indirect descriptors: enabled;
[    0.209494]  xvda: unknown partition table
[    0.230554] Setting capacity to 3072000
[    0.230612] xvda: detected capacity change from 0 to 1572864000
[    0.277802] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[    0.277940] ALSA device list:
[    0.277958]   No soundcards found.
[    0.278902] VFS: Cannot open root device "xvda2" or unknown-block(202,2): 
error -6
[    0.278932] Please append a correct "root=" boot option; here are the 
available partitions:
[    0.278963] ca00         1536000 xvda  driver: vbd
[    0.278986] Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(202,2)
[    0.279013] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 
3.15.0-rc1-128773-gf7b9c0f-dirty #17
[    0.279065] [<c0216234>] (unwind_backtrace) from [<c0211e5c>] 
(show_stack+0x10/0x14)
[    0.279098] [<c0211e5c>] (show_stack) from [<c07fc058>] 
(dump_stack+0x88/0x98)
[    0.279129] [<c07fc058>] (dump_stack) from [<c07f989c>] (panic+0xa4/0x20c)
[    0.279160] [<c07f989c>] (panic) from [<c0a95008>] 
(mount_block_root+0x1a0/0x230)
[    0.279189] [<c0a95008>] (mount_block_root) from [<c0a951a0>] 
(mount_root+0x108/0x110)
[    0.279216] [<c0a951a0>] (mount_root) from [<c0a95300>] 
(prepare_namespace+0x158/0x19c)
[    0.279243] [<c0a95300>] (prepare_namespace) from [<c0a94cc4>] 
(kernel_init_freeable+0x1d0/0x1e0)
[    0.279271] [<c0a94cc4>] (kernel_init_freeable) from [<c07f695c>] 
(kernel_init+0xc/0xe8)
[    0.279300] [<c07f695c>] (kernel_init) from [<c020ed78>] 
(ret_from_fork+0x14/0x3c)
[    0.279331] ---[ end Kernel panic - not syncing: VFS: Unable to mount root 
fs on unknown-block(202,2)







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