Xen users - Jul 2009 - blktapctrl.c : CTLMSG_NEWDEV_FAIL

Hello!


I''ve been trying to get Xen 3.4 (Ubuntu packages, Hardy 2.6.24 Dom0,
Jaunty DomU) to work with tap:aio. For some reason the guest will boot just fine
sometimes, but other times it complains about not finding the root device, and
throws me into busybox. When I checked /dev, it lacked sda1, xvda1 and disk.
(As a side note, I tried using Xen 3.3 too, but for some reason xen throws error
"Function not implemented" when trying to start the image).

I''ve checked /var/log/daemon.log and found these disturbing lines:

Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl.c:441: Received
CTLMSG_IMG: 2048000, 512, 0
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl_linux.c:56: Sent domid
5 and be_id 2049
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl_linux.c:23:
/dev/xen/blktap2 device already exists
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl_linux.c:75: Received
device id 2 and major 254
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl.c:725: Received a poll
for a new devmap
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl.c:334: Write_msg
called: CTLMSG_NEWDEV
Jul 14 02:33:05 texasranger TAPDISK[7007]: tapdisk.c:389: Tapdisk: Received msg,
len 20, type 4, UID 4
Jul 14 02:33:05 texasranger TAPDISK[7007]: tapdisk.c:447: Retrieving state,
cookie 4.....[FAIL]
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl.c:457: Received
CTLMSG_NEWDEV_FAIL
Jul 14 02:33:05 texasranger BLKTAPCTRL[4203]: blktapctrl.c:732: Read_msg failed
- CTLMSG_NEWDEV_RSP

For some reason tapdisk cannot retrieve state (whatever that means), so the
device creation fails. I don''t know if this is a bug, or if it is due
to my configuration, but if someone in the know has any ideas, I would be most
grateful.

Thanks in advance!

Andreas

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