libvirt users - Aug 2014 - Ubuntu 14.04 LTS KVM issue: setdev ioctl failed on blockpoll: Device or resource busy

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Hi, 

I ran into a strange issue when I brought up my virtual device on KVM
after I upgraded my box to Ubuntu 14.04 LTS.

My virtual device has two disks: one boot disk and one empty disk. It was
able to boot up, but ioctl on the second disk image failed with error
messages like:

	setdev ioctl failed on blockpoll: Device or resource busy


Any thoughts what happened. It worked fine with Ubuntu 12. Our virtual
device called open_bdev_exclusive and failed. AppArmor seems not the
problem because I saw the same issue with app armor disabled.

Thanks.


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