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+
+qemu-kvm with snapshot option always fails with Permission denied Could not open disk image
+
+I'm trying to use the option: -snapshot       write to temporary files instead of disk image files
+
+How to reproduce? See following log:
+2013-06-20 02:13:18.532+0000: starting up
+LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 -S -M pc-1.0 -no-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name instance-0000002b -uuid 2d600758-ae56-48b8-bd4d-999744a038e4 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-0000002b.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -kernel /opt/stack/data/nova/instances/instance-0000002b/kernel -initrd /opt/stack/data/nova/instances/instance-0000002b/ramdisk -append root=/dev/vda console=ttyS0 -drive file=/opt/stack/data/nova/instances/instance-0000002b/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=19,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=fa:16:3e:03:ab:18,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/opt/stack/data/nova/instances/instance-0000002b/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:26868 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -snapshot
+Domain id=1 is tainted: custom-argv
+char device redirected to /dev/pts/18
+qemu-system-x86_64: -drive file=/opt/stack/data/nova/instances/instance-0000002b/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: could not open disk image /opt/stack/data/nova/instances/instance-0000002b/disk: Permission denied
+2013-06-20 02:13:18.683+0000: shutting down
+
+Version: QEMU emulator version 1.0 (qemu-kvm-1.0), Copyright (c) 2003-2008 Fabrice Bellard
+
+Related info:
+The disk is a qcow2 image with a backing file. Both the backing file and the disk are cmodded with 777.
+
+This is a log from dmesg related to apparmor:
+[  236.531287] type=1400 audit(1371694399.156:17): apparmor="STATUS" operation="profile_remove" name="libvirt-2d600758-ae56-48b8-bd4d-999744a038e4" pid=4201 comm="apparmor_parser"
+
+
+libvirt.xml that I'm using:
+<domain type="qemu" xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
+  <uuid>2d600758-ae56-48b8-bd4d-999744a038e4</uuid>
+  <name>instance-0000002b</name>
+  <memory>524288</memory>
+  <vcpu>1</vcpu>
+  <os>
+    <type>hvm</type>
+    <kernel>/opt/stack/data/nova/instances/instance-0000002b/kernel</kernel>
+    <initrd>/opt/stack/data/nova/instances/instance-0000002b/ramdisk</initrd>
+    <cmdline>root=/dev/vda console=ttyS0</cmdline>
+  </os>
+  <features>
+    <acpi/>
+    <apic/>
+  </features>
+  <clock offset="utc"/>
+  <devices>
+    <disk type="file" device="disk">
+      <driver name="qemu" type="qcow2" cache="none"/>
+      <source file="/opt/stack/data/nova/instances/instance-0000002b/disk"/>
+      <target bus="virtio" dev="vda"/>
+    </disk>
+    <disk type="block" device="cdrom">
+      <driver name="qemu" type="raw"/>
+      <target tray="open" dev="hdc"/>
+      <readonly/>
+    </disk>
+    <interface type="bridge">
+      <mac address="fa:16:3e:03:ab:18"/>
+      <source bridge="br100"/>
+      <filterref filter="nova-instance-instance-0000002b-fa163e03ab18">
+        <parameter name="IP" value="10.0.0.3"/>
+        <parameter name="DHCPSERVER" value="10.0.0.1"/>
+        <parameter name="PROJNET" value="10.0.0.0"/>
+        <parameter name="PROJMASK" value="255.255.255.0"/>
+      </filterref>
+    </interface>
+    <serial type="file">
+      <source path="/opt/stack/data/nova/instances/instance-0000002b/console.log"/>
+    </serial>
+    <serial type="pty"/>
+    <input type="tablet" bus="usb"/>
+    <graphics type="vnc" autoport="no" port="32768" keymap="en-us" listen="127.0.0.1"/>
+  </devices>
+<qemu:commandline>
+   <qemu:arg value='-snapshot'/>
+</qemu:commandline>
+</domain>
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