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It's caused by qemu-kvm process is of qemu:qemu, and you tried to dump the image
to /root, where qemu:qemu doesn't have permission to write.
the cause is same with #BZ https://bugzilla.redhat.com/show_bug.cgi?id=619846
*** This bug has been marked as a duplicate of bug 619846 ***
error: Failed to core dump domain cdrom_test to cdrom_test.crash error: operation failed: Migration unexpectedly failed Version-Release number of selected component (if applicable): libvirt-0.8.1-27.el6_0.2.x86_64 qemu-kvm-0.12.1.2-2.113.el6_0.5.x86_64 kernel-2.6.32-71.13.1.el6.x86_64 How reproducible: always Steps to Reproduce: 1.virsh dumpxml cdrom_test <domain type='kvm' id='4'> <name>cdrom_test</name> <uuid>e85e2a17-06f2-5dbe-677a-d6a90e341971</uuid> <memory>1048576</memory> <currentMemory>1048576</currentMemory> <vcpu>2</vcpu> <os> <type arch='x86_64' machine='rhel6.0.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/cdrom_test.img'/> <target dev='hda' bus='ide'/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <source dev='/dev/sr0'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='network'> <mac address='52:54:00:2f:1d:cb'/> <source network='default'/> <target dev='vnet0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/1'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/1'> <source path='/dev/pts/1'/> <target port='0'/> <alias name='serial0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' keymap='en-us'/> <sound model='ac97'> <alias name='sound0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </memballoon> </devices> <seclabel type='dynamic' model='selinux'> <label>system_u:system_r:svirt_t:s0:c802,c988</label> <imagelabel>system_u:object_r:svirt_image_t:s0:c802,c988</imagelabel> </seclabel> </domain> 2.virsh start cdrom 3.virsh dump --crash cdrom_test cdrom_test.crash Actual results: error: Failed to core dump domain cdrom_test to cdrom_test.crash error: operation failed: Migration unexpectedly failed