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Re: [Xen-devel] blktap3: libxl complaining when a domain gets destroyed

On 24/04/13 13:46, Thanos Makatos wrote:
> I'm testing blktap3 and when I destroy a domain via "xl destroy 21" I get the 
> following behaviour: "xl destroy 21" seems to pause for a couple of seconds 
> and then spits out the following:
> libxl: error: libxl_device.c:882:device_backend_callback: unable to remove 
> device with path /local/domain/0/backend/vbd3/21/51712

This is because libxl will wait for the backend to reach state '6'
(closed). Even if state 6 is not reached libxl will clean up the backend
path, you should check why blktap3 doesn't set the backend to state 6.

> libxl: error: libxl.c:1453:devices_destroy_cb: libxl__devices_destroy failed 
> for 21
> Apart from these messages, the domain seems to be correctly destroyed and 
> there aren't any leftovers in XenStore. I'm able to successfully start and 
> stop the domain multiple times. What is libxl complaining about?
> --
> Thanos Makatos
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> http://lists.xen.org/xen-devel

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