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

[Roland Paterson-Jones <roland@rolandpj.com>]

Ewan Mellor wrote:

>Could we see your /var/log/xen/*  and the output of xenstore-ls?
>  
>
I suspect this part of the xenstore-ls may be significant:

   error = ""
    backend = ""
     tap = ""
      1 = ""
       2049 = ""
        error = "2 getting info"

Is there somewhere I can get more info on the cause of the error? Also, 
given that the error seems 'sticky', in that 'xm shutdown' and 'xm 
destroy' don't appear to be able to get rid of the tap device, how do I 
identify where the tapdisk (or whatever) process is stuck?

Thanks for any advice
Regards
Roland

Here's the full xenstore-ls after the dom-U hangs and before I've done 
anything to try to shut it down:

[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"
 00000000-0000-0000-0000-0000ec292018 = ""
  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 = "00000000-0000-0000-0000-0000ec292018"
  on_reboot = "restart"
  start_time = "1163078366.42"
  on_poweroff = "destroy"
  name = "dom_92018"
  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_92018"
       frontend = "/local/domain/1/device/vbd/2049"
       dev = "sda1"
       state = "4"
       params = "qcow:/mnt/instance_image_store_1/3811.qcow"
       mode = "w"
       online = "1"
       frontend-id = "1"
       type = "tap"
       sectors = "3123200"
       sector-size = "512"
       info = "0"
       hotplug-status = "connected"
    vbd = ""
     1 = ""
      2050 = ""
       domain = "dom_92018"
       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_92018"
       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"
    vif = ""
     1 = ""
      0 = ""
       domain = "dom_92018"
       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"
   error = ""
    backend = ""
     tap = ""
      1 = ""
       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 = "786743"
    port = "2"
    limit = "1048576"
    tty = "/dev/pts/2"
   name = "dom_92018"
   vm = "/vm/00000000-0000-0000-0000-0000ec292018"
   domid = "1"
   cpu = ""
    0 = ""
     availability = "online"
   memory = ""
    target = "1740800"
   store = ""
    ring-ref = "786744"
    port = "1"