Re: [Xen-users] Re: [Xen-devel] tap:qcow causes dom-U to hang in 3.0.3

[Julian Chesterfield <jac90@xxxxxxxxx>]

Roland,

Can you also verify whether there's an active tapdisk process running 
in Dom0 for each tap:{aio,qcow} vbd. We are aware of a bug with the 
qcow implementation that we hope to submit a fix for very soon. It's 
likely that you are seeing the same issue.
- Julian

On 9 Nov 2006, at 07:58, Roland Paterson-Jones wrote:

> Ewan Mellor wrote:
>
> > On Wed, Nov 08, 2006 at 04:50:43PM +0200, Roland Paterson-Jones wrote:
> >
> > > [root@dom0]# xm list
> > > Error: Device 2050 not connected
> > > Usage: xm list [options] [Domain, ...]
> > >
> > > Curiously, it seems that device 2050 was a secondary block device 
> > > exposed using phy:.
> > > So, any advice on how to debug this?
> > Could we see your /var/log/xen/*  and the output of xenstore-ls?
> Logs attached. xenstore-ls below.
>
> I had two domains running. One with root-fs using 
> tap:aio:/mnt/instance_image_store_1/3811, and a second dom-U on 
> tap:qcow:/mnt/instance_image_store_0/3811.qcow, which was set up as a 
> COW overlay of image file /mnt/instance_image_store_0/3811 (not the 
> same as the tap:aio: image for the first domU - the directories differ 
> in their last digit).
> Then both dom-U's also had/have a swap partition (vbd phy:) on 
> /dev/VolGroupDomU/instance_swap_store_1/0 and a second vbd phy: on 
> /dev/VolGroupDomU/instance_ephemeral_store_1/0.
> The 'xenstore-ls' also shows 
> qcow:/mnt/instance_image_store_2/3811.qcow which I don't think should 
> be there at all (maybe from a previous failed attempt).
> Could this be related to tap:qcow: mounts not umounting? I previously 
> set up a test tap:qcow: device in dom0 using 'block-attach 0 ...', 
> then mounted it, which seemed to work OK. However 'umount ...' then 
> hung (seemingly in the kernel - I had to reboot to get rid of it).
> Thx Roland
>
> -----------------------------------------
> [root@dom0 ~]# xenstore-ls
> tool = ""
> xenstored = ""
> vm = ""
> 00000000-0000-0000-0000-000000000000 = ""
>  shadow_memory = "0"
>  uuid = "00000000-0000-0000-0000-000000000000"
>  on_reboot = "restart"
>  on_poweroff = "destroy"
>  name = "Domain-0"
>  xend = ""
>   restart_count = "0"
>  vcpus = "2"
>  vcpu_avail = "3"
>  memory = "1023"
>  on_crash = "restart"
>  maxmem = "1023"
> 00000000-0000-0000-0000-0000ec291715 = ""
>  image = "(linux (kernel /boot/vmlinuz-2.6.16.29-xen) (ramdisk 
> /boot/initrd-2.6.16.29-xen.img) (..."
>   ostype = "linux"
>   kernel = "/boot/vmlinuz-2.6.16.29-xen"
>   cmdline = " root=/dev/sda1 ro 4"
>   ramdisk = "/boot/initrd-2.6.16.29-xen.img"
>  shadow_memory = "0"
>  uuid = "00000000-0000-0000-0000-0000ec291715"
>  on_reboot = "restart"
>  start_time = "1162994682.56"
>  on_poweroff = "destroy"
>  name = "dom_91715"
>  xend = ""
>   restart_count = "0"
>  vcpus = "1"
>  vcpu_avail = "1"
>  memory = "1700"
>  on_crash = "restart"
>  maxmem = "1700"
> local = ""
> domain = ""
>  0 = ""
>   cpu = ""
>    0 = ""
>     availability = "online"
>    1 = ""
>     availability = "online"
>   memory = ""
>    target = "1047552"
>   name = "Domain-0"
>   console = ""
>    limit = "1048576"
>   vm = "/vm/00000000-0000-0000-0000-000000000000"
>   domid = "0"
>   backend = ""
>    tap = ""
>     1 = ""
>      2049 = ""
>       domain = "dom_91715"
>       frontend = "/local/domain/1/device/vbd/2049"
>       dev = "sda1"
>       state = "4"
>       params = "aio:/mnt/instance_image_store_1/3811"
>       mode = "w"
>       online = "1"
>       frontend-id = "1"
>       type = "tap"
>       sectors = "3123200"
>       sector-size = "512"
>       info = "0"
>       hotplug-status = "connected"
>     2 = ""
>      2049 = ""
>       domain = "dom_91721"
>       frontend = "/local/domain/2/device/vbd/2049"
>       dev = "sda1"
>       state = "4"
>       params = "qcow:/mnt/instance_image_store_0/3811.qcow"
>       mode = "w"
>       online = "1"
>       frontend-id = "2"
>       type = "tap"
>       sectors = "3123200"
>       sector-size = "512"
>       info = "0"
>       hotplug-status = "connected"
>     3 = ""
>      2049 = ""
>       domain = "dom_91723"
>       frontend = "/local/domain/3/device/vbd/2049"
>       dev = "sda1"
>       state = "1"
>       params = "qcow:/mnt/instance_image_store_2/3811.qcow"
>       mode = "w"
>       online = "1"
>       frontend-id = "3"
>       type = "tap"
>       sectors = "3123200"
>       sector-size = "512"
>       info = "0"
>    vbd = ""
>     1 = ""
>      2050 = ""
>       domain = "dom_91715"
>       frontend = "/local/domain/1/device/vbd/2050"
>       dev = "sda2"
>       state = "4"
>       params = "/dev/VolGroupDomU/instance_ephemeral_store_1"
>       mode = "w"
>       online = "1"
>       frontend-id = "1"
>       type = "phy"
>       physical-device = "fd:6"
>       hotplug-status = "connected"
>       sectors = "312737792"
>       info = "0"
>       sector-size = "512"
>      2051 = ""
>       domain = "dom_91715"
>       frontend = "/local/domain/1/device/vbd/2051"
>       dev = "sda3"
>       state = "4"
>       params = "/dev/VolGroupDomU/instance_swap_store_1"
>       mode = "w"
>       online = "1"
>       frontend-id = "1"
>       type = "phy"
>       physical-device = "fd:7"
>       hotplug-status = "connected"
>       sectors = "1835008"
>       info = "0"
>       sector-size = "512"
>     2 = ""
>      2050 = ""
>       domain = "dom_91721"
>       frontend = "/local/domain/2/device/vbd/2050"
>       dev = "sda2"
>       state = "4"
>       params = "/dev/VolGroupDomU/instance_ephemeral_store_0"
>       mode = "w"
>       online = "1"
>       frontend-id = "2"
>       type = "phy"
>       physical-device = "fd:3"
>       hotplug-status = "connected"
>       sectors = "312737792"
>       info = "0"
>       sector-size = "512"
>      2051 = ""
>       domain = "dom_91721"
>       frontend = "/local/domain/2/device/vbd/2051"
>       dev = "sda3"
>       state = "4"
>       params = "/dev/VolGroupDomU/instance_swap_store_0"
>       mode = "w"
>       online = "1"
>       frontend-id = "2"
>       type = "phy"
>       physical-device = "fd:4"
>       hotplug-status = "connected"
>       sectors = "1835008"
>       info = "0"
>       sector-size = "512"
>     3 = ""
>      2050 = ""
>       domain = "dom_91723"
>       frontend = "/local/domain/3/device/vbd/2050"
>       dev = "sda2"
>       state = "1"
>       params = "/dev/VolGroupDomU/instance_ephemeral_store_2"
>       mode = "w"
>       online = "1"
>       frontend-id = "3"
>       type = "phy"
>      2051 = ""
>       domain = "dom_91723"
>       frontend = "/local/domain/3/device/vbd/2051"
>       dev = "sda3"
>       state = "1"
>       params = "/dev/VolGroupDomU/instance_swap_store_2"
>       mode = "w"
>       online = "1"
>       frontend-id = "3"
>       type = "phy"
>    vif = ""
>     1 = ""
>      0 = ""
>       domain = "dom_91715"
>       handle = "0"
>       script = "/etc/xen/scripts/vif-aes"
>       state = "4"
>       frontend = "/local/domain/1/device/vif/0"
>       mac = "12:31:34:00:03:8F"
>       online = "1"
>       frontend-id = "1"
>       feature-sg = "1"
>       feature-gso-tcpv4 = "1"
>       feature-rx-copy = "1"
>       hotplug-status = "connected"
>     3 = ""
>      0 = ""
>       domain = "dom_91723"
>       handle = "0"
>       script = "/etc/xen/scripts/vif-aes"
>       state = "5"
>       frontend = "/local/domain/3/device/vif/0"
>       mac = "12:31:34:00:03:8D"
>       online = "0"
>       frontend-id = "3"
>   error = ""
>    backend = ""
>     tap = ""
>      1 = ""
>       2049 = ""
>        error = "2 getting info"
>      2 = ""
>       2049 = ""
>        error = "2 getting info"
>  1 = ""
>   device = ""
>    vbd = ""
>     2049 = ""
>      backend-id = "0"
>      virtual-device = "2049"
>      device-type = "disk"
>      state = "4"
>      backend = "/local/domain/0/backend/tap/1/2049"
>      ring-ref = "8"
>      event-channel = "6"
>     2050 = ""
>      backend-id = "0"
>      virtual-device = "2050"
>      device-type = "disk"
>      state = "4"
>      backend = "/local/domain/0/backend/vbd/1/2050"
>      ring-ref = "9"
>      event-channel = "7"
>     2051 = ""
>      backend-id = "0"
>      virtual-device = "2051"
>      device-type = "disk"
>      state = "4"
>      backend = "/local/domain/0/backend/vbd/1/2051"
>      ring-ref = "10"
>      event-channel = "8"
>    vif = ""
>     0 = ""
>      backend-id = "0"
>      mac = "12:31:34:00:03:8F"
>      handle = "0"
>      state = "4"
>      backend = "/local/domain/0/backend/vif/1/0"
>      tx-ring-ref = "523"
>      rx-ring-ref = "524"
>      event-channel = "9"
>      request-rx-copy = "0"
>      feature-rx-notify = "1"
>      feature-sg = "1"
>      feature-gso-tcpv4 = "1"
>   device-misc = ""
>    vif = ""
>     nextDeviceID = "1"
>   console = ""
>    ring-ref = "995310"
>    port = "2"
>    limit = "1048576"
>    tty = "/dev/pts/2"
>   name = "dom_91715"
>   vm = "/vm/00000000-0000-0000-0000-0000ec291715"
>   domid = "1"
>   cpu = ""
>    0 = ""
>     availability = "online"
>   memory = ""
>    target = "1740800"
>   store = ""
>    ring-ref = "995311"
>    port = "1"
>
>
> > Thanks,
> >
> > Ewan.
> >
> > _______________________________________________
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