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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] the /dev/xvda can not be mounted and read/write when using xl create domU
At 2014-04-17 00:47:15, "Ian Campbell" <Ian.Campbell@xxxxxxxxxx> wrote: >On Wed, 2014-04-16 at 10:47 -0500, Wei Huang wrote: >> On 04/16/2014 10:29 AM, duqi 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', ] >> >> Based on the log, I think your loop2 might have problem. If you are >> using image from Linaro, you should specify the offset in losetup. Here >> is one: >> >> > losetup -o 54525952 /dev/loop2 ./rootfs.img > Thanks very much for your advices. I want to know how the "54525952" offset can be computed? Mr Huang, could you give me some advice? >Or use root=/dev/xvda2 on the guest command line/cfg, which would be >more usual I think. > >(I'm not convinced this is the error though, since it seems xvda just >isn't working). > >duqi could you post the output of "xenstore-ls -fp" while the guest is >running but not able to access its disk. > Hi, here is my config of guest now: kernel = "/root/zImage" memory = "64" name = "dom11" vcpus = 1 serial="pty" root="/dev/xvda2" extra = "console=hvc0,xencons=tty" disk = [ 'phy:/dev/loop2,xvda,w' ] vif=[ 'mac=00:16:3e:56:af:69,bridge=xenbr0,type=netfront', ] and here is the output of "xenstore-ls -fp" while the guest is running: root@linaro-alip:~# xenstore-ls -fp /tool = "" (n0) /tool/xenstored = "" (n0) /local = "" (n0) /local/domain = "" (n0) /local/domain/0 = "" (n0) /local/domain/0/name = "Domain-0" (n0) /local/domain/0/domid = "0" (n0) /local/domain/0/libxl = "" (n0) /local/domain/0/libxl/disable_udev = "1" (n0) /local/domain/0/backend = "" (n0) /local/domain/0/backend/vbd = "" (n0) /local/domain/0/backend/vbd/16 = "" (n0) /local/domain/0/backend/vbd/16/51712 = "" (n0,r16) /local/domain/0/backend/vbd/16/51712/frontend = "/local/domain/16/device/vbd/51712" (n0,r16) /local/domain/0/backend/vbd/16/51712/params = "/dev/loop2" (n0,r16) /local/domain/0/backend/vbd/16/51712/script = "/etc/xen/scripts/block" (n0,r16) /local/domain/0/backend/vbd/16/51712/physical-device = "7:0" (n0,r16) /local/domain/0/backend/vbd/16/51712/frontend-id = "16" (n0,r16) /local/domain/0/backend/vbd/16/51712/online = "1" (n0,r16) /local/domain/0/backend/vbd/16/51712/removable = "0" (n0,r16) /local/domain/0/backend/vbd/16/51712/bootable = "1" (n0,r16) /local/domain/0/backend/vbd/16/51712/state = "4" (n0,r16) /local/domain/0/backend/vbd/16/51712/dev = "xvda" (n0,r16) /local/domain/0/backend/vbd/16/51712/type = "phy" (n0,r16) /local/domain/0/backend/vbd/16/51712/mode = "w" (n0,r16) /local/domain/0/backend/vbd/16/51712/device-type = "disk" (n0,r16) /local/domain/0/backend/vbd/16/51712/feature-flush-cache = "1" (n0,r16) /local/domain/0/backend/vbd/16/51712/discard-granularity = "4096" (n0,r16) /local/domain/0/backend/vbd/16/51712/discard-alignment = "0" (n0,r16) /local/domain/0/backend/vbd/16/51712/discard-secure = "0" (n0,r16) /local/domain/0/backend/vbd/16/51712/feature-discard = "1" (n0,r16) /local/domain/0/backend/vbd/16/51712/feature-barrier = "1" (n0,r16) /local/domain/0/backend/vbd/16/51712/feature-persistent = "1" (n0,r16) /local/domain/0/backend/vbd/16/51712/feature-max-indirect-segments = "256" (n0,r16) /local/domain/0/backend/vbd/16/51712/sectors = "2965504" (n0,r16) /local/domain/0/backend/vbd/16/51712/info = "0" (n0,r16) /local/domain/0/backend/vbd/16/51712/sector-size = "512" (n0,r16) /local/domain/0/backend/vbd/16/51712/physical-sector-size = "512" (n0,r16) /local/domain/0/backend/console = "" (n0) /local/domain/0/backend/console/16 = "" (n0) /local/domain/0/backend/console/16/0 = "" (n0,r16) /local/domain/0/backend/console/16/0/frontend = "/local/domain/16/console" (n0,r16) /local/domain/0/backend/console/16/0/frontend-id = "16" (n0,r16) /local/domain/0/backend/console/16/0/online = "1" (n0,r16) /local/domain/0/backend/console/16/0/state = "1" (n0,r16) /local/domain/0/backend/console/16/0/domain = "dom11" (n0,r16) /local/domain/0/backend/console/16/0/protocol = "vt100" (n0,r16) /local/domain/0/backend/vif = "" (n0) /local/domain/0/backend/vif/16 = "" (n0) /local/domain/0/backend/vif/16/0 = "" (n0,r16) /local/domain/0/backend/vif/16/0/frontend = "/local/domain/16/device/vif/0" (n0,r16) /local/domain/0/backend/vif/16/0/frontend-id = "16" (n0,r16) /local/domain/0/backend/vif/16/0/online = "1" (n0,r16) /local/domain/0/backend/vif/16/0/state = "4" (n0,r16) /local/domain/0/backend/vif/16/0/script = "/etc/xen/scripts/vif-bridge" (n0,r16) /local/domain/0/backend/vif/16/0/mac = "00:16:3e:56:af:69" (n0,r16) /local/domain/0/backend/vif/16/0/bridge = "xenbr0" (n0,r16) /local/domain/0/backend/vif/16/0/handle = "0" (n0,r16) /local/domain/0/backend/vif/16/0/type = "vif" (n0,r16) /local/domain/0/backend/vif/16/0/feature-sg = "1" (n0,r16) /local/domain/0/backend/vif/16/0/feature-gso-tcpv4 = "1" (n0,r16) /local/domain/0/backend/vif/16/0/feature-gso-tcpv6 = "1" (n0,r16) /local/domain/0/backend/vif/16/0/feature-ipv6-csum-offload = "1" (n0,r16) /local/domain/0/backend/vif/16/0/feature-rx-copy = "1" (n0,r16) /local/domain/0/backend/vif/16/0/feature-rx-flip = "0" (n0,r16) /local/domain/0/backend/vif/16/0/feature-split-event-channels = "1" (n0,r16) /local/domain/0/backend/vif/16/0/hotplug-status = "connected" (n0,r16) /local/domain/16 = "" (n0,r16) /local/domain/16/vm = "/vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194" (n0,r16) /local/domain/16/name = "dom11" (n0,r16) /local/domain/16/cpu = "" (n0,r16) /local/domain/16/cpu/0 = "" (n0,r16) /local/domain/16/cpu/0/availability = "online" (n0,r16) /local/domain/16/memory = "" (n0,r16) /local/domain/16/memory/static-max = "65536" (n0,r16) /local/domain/16/memory/target = "65537" (n0,r16) /local/domain/16/memory/videoram = "-1" (n0,r16) /local/domain/16/device = "" (n0,r16) /local/domain/16/device/suspend = "" (n0,r16) /local/domain/16/device/suspend/event-channel = "" (n16) /local/domain/16/device/vbd = "" (n0,r16) /local/domain/16/device/vbd/51712 = "" (n16,r0) /local/domain/16/device/vbd/51712/backend = "/local/domain/0/backend/vbd/16/51712" (n16,r0) /local/domain/16/device/vbd/51712/backend-id = "0" (n16,r0) /local/domain/16/device/vbd/51712/state = "4" (n16,r0) /local/domain/16/device/vbd/51712/virtual-device = "51712" (n16,r0) /local/domain/16/device/vbd/51712/device-type = "disk" (n16,r0) /local/domain/16/device/vbd/51712/protocol = "arm-abi" (n16,r0) /local/domain/16/device/vbd/51712/ring-ref = "8" (n16,r0) /local/domain/16/device/vbd/51712/event-channel = "3" (n16,r0) /local/domain/16/device/vbd/51712/feature-persistent = "1" (n16,r0) /local/domain/16/device/vif = "" (n0,r16) /local/domain/16/device/vif/0 = "" (n16,r0) /local/domain/16/device/vif/0/backend = "/local/domain/0/backend/vif/16/0" (n16,r0) /local/domain/16/device/vif/0/backend-id = "0" (n16,r0) /local/domain/16/device/vif/0/state = "4" (n16,r0) /local/domain/16/device/vif/0/handle = "0" (n16,r0) /local/domain/16/device/vif/0/mac = "00:16:3e:56:af:69" (n16,r0) /local/domain/16/device/vif/0/tx-ring-ref = "768" (n16,r0) /local/domain/16/device/vif/0/rx-ring-ref = "769" (n16,r0) /local/domain/16/device/vif/0/event-channel-tx = "4" (n16,r0) /local/domain/16/device/vif/0/event-channel-rx = "5" (n16,r0) /local/domain/16/device/vif/0/request-rx-copy = "1" (n16,r0) /local/domain/16/device/vif/0/feature-rx-notify = "1" (n16,r0) /local/domain/16/device/vif/0/feature-sg = "1" (n16,r0) /local/domain/16/device/vif/0/feature-gso-tcpv4 = "1" (n16,r0) /local/domain/16/device/vif/0/feature-gso-tcpv6 = "1" (n16,r0) /local/domain/16/device/vif/0/feature-ipv6-csum-offload = "1" (n16,r0) /local/domain/16/control = "" (n0,r16) /local/domain/16/control/shutdown = "" (n16) /local/domain/16/control/platform-feature-multiprocessor-suspend = "1" (n0,r16) /local/domain/16/control/platform-feature-xs_reset_watches = "1" (n0,r16) /local/domain/16/data = "" (n16) /local/domain/16/domid = "16" (n0,r16) /local/domain/16/store = "" (n0,r16) /local/domain/16/store/port = "1" (n0,r16) /local/domain/16/store/ring-ref = "540673" (n0,r16) /local/domain/16/console = "" (n0,r16) /local/domain/16/console/backend = "/local/domain/0/backend/console/16/0" (n0,r16) /local/domain/16/console/backend-id = "0" (n16,r0) /local/domain/16/console/limit = "1048576" (n0,r16) /local/domain/16/console/type = "xenconsoled" (n0,r16) /local/domain/16/console/output = "pty" (n0,r16) /local/domain/16/console/tty = "/dev/pts/0" (n0,r16) /local/domain/16/console/port = "2" (n0,r16) /local/domain/16/console/ring-ref = "540672" (n0,r16) /vm = "" (n0) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194 = "" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/uuid = "3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/name = "dom11" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/image = "" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/image/ostype = "linux" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/image/kernel = "/root/zImage" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/image/cmdline = "root=/dev/xvda2 console=hvc0,xencons=tty" (n0,r16) /vm/3d9ec855-2ecd-4b5e-bd6a-9a0bda9b3194/start_time = "9452.17" (n0,r16) /libxl = "" (n0) /libxl/16 = "" (n0) /libxl/16/dm-version = "qemu_xen_traditional" (n0) >What is your rootfs device? (IOW what physical medium contains >rootfs.img) > >> You can also try to mount /dev/loop2 in Dom0. > >Yes, that would be a useful sanity check. > I have tested the /dev/loop2 in Dom0. First, before boot the guest， I tried to test the /dev/2 in Dom0 as below: (1)root@linaro-alip:~# losetup /dev/loop2 /root/rootfs.img root@linaro-alip:~# mount /dev/loop2 /mnt [11315.974201] EXT4-fs (loop2): mounted filesystem with ordered data mode. Opts: (null) root@linaro-alip:~# cd /mnt root@linaro-alip:/mnt# ls SHA256SUMS env.sh install mnt root srv var bin etc lib networkinfo.sh run sys boot home lost+found opt sbin tmp dev init.sh media proc selinux usr root@linaro-alip:/mnt# (2)root@linaro-alip:~# dd if=/dev/loop2 of=test bs=1 count=10000 10000+0 records in 10000+0 records out 10000 bytes (10 kB) copied, 0.181345 s, 55.1 kB/s Second, I tested the /dev/xvda in guest, I found that through I dan not mount /dev/xvda to the /mnt ,but I can read/write the /dev/xvda and the limit is 4096B, I don't know how to explain it. the test result is here: when I tried to write to the /dev/xvda： # dd if=/dev/zero of=/dev/xvda bs=1 count=1000 seek=3096 1000+0 records in 1000+0 records out # dd if=/dev/zero of=/dev/xvda bs=1 count=1000 seek=3097 [ 109.879542] end_request: I/O error, dev xvda, sector 8 dd: writing '/dev/xvda': Input/output error 1000+0 records in 999+0 records out when I tried to read from the /dev/xvda, if the count exceed the 4096 , like 4097 , the guest's kernel crashed : # dd if=/dev/xvda of=test bs=1 count=4096 [ 92.017991] end_request: I/O error, dev xvda, sector 0 [ 92.018047] Buffer I/O error on device xvda, logical block 0 [ 92.018091] Buffer I/O error on device xvda, logical block 1 [ 92.018117] Buffer I/O error on device xvda, logical block 2 [ 92.018139] Buffer I/O error on device xvda, logical block 3 4096+0 records in 4096+0 records out # dd if=/dev/xvda of=test bs=1 count=4097 [ 95.300508] end_request: I/O error, dev xvda, sector 0 [ 95.300563] Buffer I/O error on device xvda, logical block 0 [ 95.319928] end_request: I/O error, dev xvda, sector 0 dd: /dev/xvda: Input/output error # dd if=/dev/xvda of=test bs=1 count=4097 [ 96.438770] end_request: I/O error, dev xvda, sector 0 [ 96.438825] quiet_error: 4 callbacks suppressed [ 96.438845] Buffer I/O error on device xvda, logical block 0 [ 96.438887] Buffer I/O error on device xvda, logical block 1 [ 96.438911] Buffer I/O error on device xvda, logical block 2 [ 96.438932] Buffer I/O error on device xvda, logical block 3 [ 96.494271] end_request: I/O error, dev xvda, sector 32 [ 96.494322] Buffer I/O error on device xvda, logical block 4 [ 96.494350] Buffer I/O error on device xvda, logical block 5 [ 96.494371] Buffer I/O error on device xvda, logical block 6 [ 96.494393] Buffer I/O error on device xvda, logical block 7 [ 96.494414] Buffer I/O error on device xvda, logical block 8 [ 96.494434] Buffer I/O error on device xvda, logical block 9 [ 96.534454] ------------[ cut here ]------------ [ 96.534518] WARNING: CPU: 0 PID: 0 at drivers/block/xen-blkfront.c:1149 blkif_interrupt+0x394/0x7b8() [ 96.534544] xvda: response to read (id 0) couldn't be recycled! [ 96.534562] Modules linked in: [ 96.534591] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.15.0-rc1-128773-gf7b9c0f-dirty #12 [ 96.534642] [<c0216234>] (unwind_backtrace) from [<c0211e5c>] (show_stack+0x10/0x14) [ 96.534682] [<c0211e5c>] (show_stack) from [<c07f9210>] (dump_stack+0x88/0x98) [ 96.534719] [<c07f9210>] (dump_stack) from [<c0242f7c>] (warn_slowpath_common+0x6c/0x88) [ 96.534754] [<c0242f7c>] (warn_slowpath_common) from [<c0242fc8>] (warn_slowpath_fmt+0x30/0x40) [ 96.534787] [<c0242fc8>] (warn_slowpath_fmt) from [<c0553fd4>] (blkif_interrupt+0x394/0x7b8) [ 96.534825] [<c0553fd4>] (blkif_interrupt) from [<c0280788>] (handle_irq_event_percpu+0x38/0x130) [ 96.534859] [<c0280788>] (handle_irq_event_percpu) from [<c02808c0>] (handle_irq_event+0x40/0x60) [ 96.534893] [<c02808c0>] (handle_irq_event) from [<c0283380>] (handle_edge_irq+0xa0/0x188) [ 96.534924] [<c0283380>] (handle_edge_irq) from [<c027fec4>] (generic_handle_irq+0x2c/0x3c) [ 96.534957] [<c027fec4>] (generic_handle_irq) from [<c04ae010>] (evtchn_fifo_handle_events+0x190/0x1a0) [ 96.534995] [<c04ae010>] (evtchn_fifo_handle_events) from [<c04ab4e0>] (__xen_evtchn_do_upcall+0x70/0xa4) [ 96.535032] [<c04ab4e0>] (__xen_evtchn_do_upcall) from [<c020e4c4>] (xen_arm_callback+0x8/0x10) [ 96.535066] [<c020e4c4>] (xen_arm_callback) from [<c0283ae4>] (handle_percpu_devid_irq+0x6c/0x84) [ 96.535101] [<c0283ae4>] (handle_percpu_devid_irq) from [<c027fec4>] (generic_handle_irq+0x2c/0x3c) [ 96.535133] [<c027fec4>] (generic_handle_irq) from [<c020f5c0>] (handle_IRQ+0x40/0x90) [ 96.535163] [<c020f5c0>] (handle_IRQ) from [<c02087ec>] (gic_handle_irq+0x2c/0x5c) [ 96.535193] [<c02087ec>] (gic_handle_irq) from [<c02129c0>] (__irq_svc+0x40/0x50) [ 96.535216] Exception stack(0xc0d33f50 to 0xc0d33f98) [ 96.535237] 3f40: ffffffed 00000000 00000001 c021b860 [ 96.535264] 3f60: c0d3a4c0 c0d32000 c0d3a458 00000000 00000000 c0d30098 ffffffed c0d32000 [ 96.535289] 3f80: 00000000 c0d33f98 c020f8dc c020f8e0 60000013 ffffffff [ 96.535318] [<c02129c0>] (__irq_svc) from [<c020f8e0>] (arch_cpu_idle+0x38/0x3c) [ 96.535351] [<c020f8e0>] (arch_cpu_idle) from [<c0276570>] (cpu_startup_entry+0x148/0x238) [ 96.535384] [<c0276570>] (cpu_startup_entry) from [<c0a90ae8>] (start_kernel+0x348/0x354) [ 96.535409] ---[ end trace 3327f9668d429059 ]--- Then I went back to Dom0 and test the /dev/loop2, it always works. Here is the test: root@linaro-alip:/# mount /dev/loop2 /mnt [11597.873141] EXT4-fs (loop2): mounted filesystem with ordered data mode. Opts: (null) root@linaro-alip:/# cd /mnt root@linaro-alip:/mnt# ls SHA256SUMS env.sh install mnt root srv var bin etc lib networkinfo.sh run sys boot home lost+found opt sbin tmp dev init.sh media proc selinux usr root@linaro-alip:/mnt# Many thanks again. duqi. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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