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