[libvirt] virCommandProcessIO: hangs on poll()

recent qemu (git resp) with param like: #qemu-kvm -S -no-user-config -nodefaults -nographic -M none -qmp monarg -pidfile pidfile will just hangs forever. no any output or errors . and when libvirt Try to get caps via QMP qemuCaps. it run above command. so virCommandProcessIO call

[libvirt] virsh list hangs

please help me, i just installed libvirt-git and qemu-git to my gentoo os. when i start libvirtd, then type virsh list , it has no response. hangs forever. following is my typed cmd: $LIBVIRT_DEBUG=1 libvirtd .. 2013-04-09 08:39:03.649+: 17021: debug : virFileClose:72 :