Xen users - Jun 2010 - blk_tap: Error initialising /dev/xen/blktap - No more devices

Hello,
    i am experiencing something weird on my Xen Dom0

Since a few days, i can no more install or reboot any vm using tap:aio driver
My vms complains about no mounted disks

OS:
On openSUSE 11.2 (x86_64) with xen-tools-3.4.1_19718_04-2.1.x86_64
kernel-xen-base-2.6.31.8-0.1.1.x86_64
xen-libs-3.4.1_19718_04-2.1.x86_64
kernel-xen-2.6.31.8-0.1.1.x86_64
xen-kmp-desktop-3.4.1_19718_04_2.6.31.5_0.1-2.1.x86_64
xen-3.4.1_19718_04-2.1.x86_64

i can no more create or reboot any VMs using tap:aio driver. All seems to be
fine with other VMs with "file" driver


un  7 16:11:41 alca2 kernel: [12537879.848530] blk_tap: Error initialising
/dev/xen/blktap - No more devices
Jun  7 16:11:41 alca2 logger: /etc/xen/scripts/blktap: Writing
backend/tap/136/51712/hotplug-status connected to xenstore.
Jun  7 16:11:41 alca2 logger: /etc/xen/scripts/blktap: Writing
backend/tap/136/51728/hotplug-status connected to xenstore.
Jun  7 16:11:44 alca2 kernel: [12533839.409637] blktap: ring-ref 8,
event-channel 12, protocol 1 (x86_64-abi)
Jun  7 16:11:44 alca2 kernel: [12533839.412361] blktap: ring-ref 9,
event-channel 13, protocol 1 (x86_64-abi)
Jun  7 16:12:09 alca2 logger: /etc/xen/scripts/blktap: remove
XENBUS_PATH=backend/tap/136/51712
Jun  7 16:12:09 alca2 logger: /etc/xen/scripts/blktap: remove
XENBUS_PATH=backend/tap/136/51728
Jun  7 16:12:09 alca2 logger: /etc/xen/scripts/blktap: remove
XENBUS_PATH=backend/tap/136/51728
Jun  7 16:12:09 alca2 logger: /etc/xen/scripts/blktap: remove
XENBUS_PATH=backend/tap/136/51712

Screeshot of a booting VM:
ftp://ftp.ehess.fr/incoming/pb-tapaio.png


I am looking for any idea of how to get rid of this.
Is someone exerienced the same ?

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