Hi, I made the patch that corrected the following problem. It is that when I execute the "virsh vcpupin" command to inactive domains on Xend3.0.3, Libvirt outputs the following Segmentation fault. # virsh vcpupin guest_dom 0 0,1,2 Segmentation fault Signed-off-by: Tomohiro Takahashi <takatom(a)jp.fujitsu.com&gt; Thanks, Tomohiro Takahashi --- xm_internal.c.org 2009-04-07 21:50:17.000000000 +0900 +++ xm_internal.c 2009-04-13 20:53:22.000000000 +0900 @@ -1700,7 +1700,8 @@ int xenXMDomainPinVcpu(virDomainPtr doma ret = 0; cleanup: - VIR_FREE(mapstr); + if( *mapstr != '\0' ) + VIR_FREE(mapstr); VIR_FREE(cpuset); xenUnifiedUnlock(priv); return (ret);