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Description of problem: KVM VM hangs taking 100% CPU using Version-Release number of selected component (if applicable): [root@kvmhost_188_106 /windows_seed]# virsh version Compiled against library: libvirt 1.1.1 Using library: libvirt 1.1.1 Using API: QEMU 1.1.1 Running hypervisor: QEMU 1.5.3 How reproducible: this issue happend sometimes . Actual results: hang at "Booting from hard disk ..." Expected results: the guest os should booting successfully Additional info: gdb /usr/libexec/qemu-kvm -p 18984 (gdb) info threads 6 Thread 0x7f371317a700 (LWP 18985) 0x00007f37186f6e07 in ioctl () at ../sysdeps/unix/syscall-template.S:82 5 Thread 0x7f3712979700 (LWP 18986) 0x00007f37186f6e07 in ioctl () at ../sysdeps/unix/syscall-template.S:82 4 Thread 0x7f3712178700 (LWP 18987) 0x00007f37186f6e07 in ioctl () at ../sysdeps/unix/syscall-template.S:82 3 Thread 0x7f3711977700 (LWP 18988) 0x00007f37186f6e07 in ioctl () at ../sysdeps/unix/syscall-template.S:82 2 Thread 0x7f3702bff700 (LWP 18991) pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162 * 1 Thread 0x7f371c16c940 (LWP 18984) 0x00007f37186f5613 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87 (gdb) bt #0 0x00007f37186f5613 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87 #1 0x00007f371c33ae15 in os_host_main_loop_wait (nonblocking=<value optimized out>) at main-loop.c:226 #2 main_loop_wait (nonblocking=<value optimized out>) at main-loop.c:464 #3 0x00007f371c3b2167 in main_loop (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at vl.c:1986 #4 main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at vl.c:4343 (gdb) pls: the guest os xml : <domain type='kvm'> <name>redhat_vm1_64</name> <uuid>5a306370-5d26-4b2f-8aae-a095da466829</uuid> <memory unit='KiB'>8192152</memory> <currentMemory unit='KiB'>8192152</currentMemory> <vcpu placement='static'>4</vcpu> <os> <type arch='x86_64' machine='rhel6.4.0'>hvm</type> <boot dev='hd'/> <bootmenu enable='yes'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='localtime'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw'/> <source dev='/dev/domu/vm1_R'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='block' device='disk'> <driver name='qemu' type='raw'/> <source dev='/dev/domu/vm1_D'/> <target dev='vdb' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </disk> <controller type='usb' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <interface type='bridge'> <mac address='00:16:3e:f1:7c:f9'/> <source bridge='eth0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <interface type='bridge'> <mac address='00:16:3e:7d:e4:cc'/> <source bridge='eth1'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0' keymap='en-us'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </memballoon> </devices> </domain>