[ovirt-users] Failed to attach a disk

I upgraded an host to the latest version of vdsm: vdsm-4.18.21-1.el7.centos.x86_64, on a CentOS Linux release 7.3.1611 (Core) I then created a disk that I wanted to attach to a running vm, but il fails, with the message in /var/log/libvirt/qemu/<VMNAME>.log: Could not open '/rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/4d33f997-94b0-42c1-8052-5364993b85e9/8e613dd3-eebc-476a-a830-e2a8236ea8a8': Permission denied I tried to have a look at the disks images, and got a strange result: -rw-rw---- 1 vdsm qemu 1.0M May 18 2016 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/ed18c515-09c9-4a71-af0a-7f0934193a65/b5e53c81-2279-4f2b-b282-69db430d36d4.lease -rw-rw---- 1 vdsm qemu 1.0M May 18 2016 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/3a00232b-c1f9-4b9b-910e-caf8b0321609/4f6d5c63-6a36-4356-832e-f52427d9512e.lease -rw-rw---- 1 vdsm qemu 1.0M May 23 2016 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/b0f4c517-e492-409f-934f-1561281a242b/a3d60d8a-f89b-41dd-b519-fb652301b1f5.lease -rw-rw---- 1 vdsm qemu 1.0M May 23 2016 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/465df4e9-3c62-4501-889f-cbab65ed0e0d/7a9b9033-f5f8-4eaa-ac94-6cc0c4ff6120.lease -rw-rw---- 1 vdsm kvm 1.0M Jan 6 18:00 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/baf01c4e-ede9-4e4e-a265-172695d81a83/4cdd72a7-b347-4479-accd-ab08d61552f9.lease -rw-rw---- 1 vdsm kvm 1.0M Jan 18 15:38 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/4d33f997-94b0-42c1-8052-5364993b85e9/8e613dd3-eebc-476a-a830-e2a8236ea8a8.lease -rw-r--r-- 1 vdsm qemu 314 May 23 2016 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/b0f4c517-e492-409f-934f-1561281a242b/a3d60d8a-f89b-41dd-b519-fb652301b1f5.meta -rw-r--r-- 1 vdsm kvm 314 Jan 6 18:00 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/465df4e9-3c62-4501-889f-cbab65ed0e0d/7a9b9033-f5f8-4eaa-ac94-6cc0c4ff6120.meta -rw-r--r-- 1 vdsm kvm 307 Jan 6 18:00 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/baf01c4e-ede9-4e4e-a265-172695d81a83/4cdd72a7-b347-4479-accd-ab08d61552f9.meta -rw-r--r-- 1 vdsm kvm 437 Jan 18 11:32 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/ed18c515-09c9-4a71-af0a-7f0934193a65/b5e53c81-2279-4f2b-b282-69db430d36d4.meta -rw-r--r-- 1 vdsm kvm 437 Jan 18 11:32 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/3a00232b-c1f9-4b9b-910e-caf8b0321609/4f6d5c63-6a36-4356-832e-f52427d9512e.meta -rw-r--r-- 1 vdsm kvm 310 Jan 18 15:38 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/4d33f997-94b0-42c1-8052-5364993b85e9/8e613dd3-eebc-476a-a830-e2a8236ea8a8.meta -rw-rw---- 1 vdsm qemu 16G Jan 9 17:25 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/baf01c4e-ede9-4e4e-a265-172695d81a83/4cdd72a7-b347-4479-accd-ab08d61552f9 -rw-rw---- 1 vdsm qemu 30K Jan 18 11:32 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/ed18c515-09c9-4a71-af0a-7f0934193a65/b5e53c81-2279-4f2b-b282-69db430d36d4 -rw-rw---- 1 vdsm qemu 30K Jan 18 11:32 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/3a00232b-c1f9-4b9b-910e-caf8b0321609/4f6d5c63-6a36-4356-832e-f52427d9512e -rw-rw---- 1 vdsm kvm 300G Jan 18 15:38 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/4d33f997-94b0-42c1-8052-5364993b85e9/8e613dd3-eebc-476a-a830-e2a8236ea8a8 -rw-rw---- 1 vdsm qemu 32G Jan 18 15:58 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/b0f4c517-e492-409f-934f-1561281a242b/a3d60d8a-f89b-41dd-b519-fb652301b1f5 -rw-rw---- 1 vdsm qemu 32G Jan 18 15:58 /rhev/data-center/17434f4e-8d1a-4a88-ae39-d2ddd46b3b9b/7c5291d3-11e2-420f-99ad-47a376013671/images/465df4e9-3c62-4501-889f-cbab65ed0e0d/7a9b9033-f5f8-4eaa-ac94-6cc0c4ff6120 What a strange mix of group owner. Any explanation for that ? Is that a known bug ? The new disk is the 300G one, owned by kvm.