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Re: [Xen-devel] Hypervisor error messages after xl block-detach with linux 3.18-rc5

On 11/25/2014 05:18 PM, Ian Campbell wrote:
On Tue, 2014-11-25 at 17:10 +0100, Juergen Gross wrote:
On 11/24/2014 11:02 AM, Ian Campbell wrote:
On Mon, 2014-11-24 at 10:55 +0100, Juergen Gross wrote:
On 11/21/2014 02:57 PM, Konrad Rzeszutek Wilk wrote:
On Fri, Nov 21, 2014 at 09:42:11AM +0100, Juergen Gross wrote:

while testing my "linear p2m list" patches I saw the following
problem (even without my patches in place):

In dom0 running linux 3.18-rc5 on top of Xen 4.4.1 I modified the
disk image of a guest by attaching it to dom0:

xl block-attach 0 file:/var/lib/libvirt/images/opensuse13-1/xvda,xvda,w
mount /dev/xvda2 /mnt
umount /mnt
xl block-detach 0 xvda

Did some more testing:
- Seems to occur only when attaching a block device to dom0

That means a qdisk backed situation then, I think.

Is your qemu up to date?

 resulted in slightly different messages, but could be related?

Tried it with xen-unstable and newest qemu. Now I have another problem:

xl -vvv block-attach 0 file:/var/lib/libvirt/images/opensuse13-1/xvda,xvda,w
libxl: debug: libxl.c:4178:libxl_device_disk_add: ao 0xbac0f0: create:
how=(nil) callback=(nil) poller=0xbac1d0
libxl: error: libxl.c:1897:device_addrm_aocomplete: unable to add device
libxl: debug: libxl_event.c:1739:libxl__ao_complete: ao 0xbac0f0:
complete, rc=-16
libxl: debug: libxl.c:4178:libxl_device_disk_add: ao 0xbac0f0:
inprogress: poller=0xbac1d0, flags=ic
libxl: debug: libxl_event.c:1711:libxl__ao__destroy: ao 0xbac0f0: destroy
libxl_device_disk_add failed.


Have you updated your initscripts to run the xen-init-dom0 helper? This
replaced the manual xenstore-write stuff a little while back and added
some other init, including creating the necessary json description of

Bingo! Now it works.



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