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

[Roland Paterson-Jones <roland@xxxxxxxxxxxx>]

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"


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