[libvirt] bug: libvirt hang while restore a domain

[Daniel Schwager]

> ** But the second time, the command hang:
> [root at xen03 srv]# virsh restore /srv/save

Update: qemu will not stop writing errors "Read failed" to
the logfile /var/log/libvirt/qemu/winxp100.log. So, it is an qemu
problem...

LC_ALL=C LD_LIBRARY_PATH=/usr/local/staf/lib:
PATH=/sbin:/usr/sbin:/bin:/usr/bin HOME=/root USER=root LOGNAME=root
/usr/kvm/bin/qemu-system-x86_64 -S -M pc -m 250 -smp 1 -name winxp100
-uuid 4e991a91-5db6-0584-3750-6a288ae01ee4 -monitor pty -pidfile
/var/run/libvirt/qemu//winxp100.pid -boot c -drive
file=/tmp/winxp100,if=ide,index=0,boot=on -net
nic,macaddr=52:54:00:cf:3e:66,vlan=0,model=e1000 -net
tap,fd=21,script=,vlan=0,ifname=vnet1 -serial pty -parallel none -usb
-usbdevice tablet -vnc 0.0.0.0:1 -incoming exec:cat 
qemu: could not open disk image /tmp/winxp100
Read failed
Read failed
Read failed
Read failed
Read failed
Read failed
Read failed
Read failed
.....