Index: trunk/packages/invirt-base/python/invirt/common.py
===================================================================
--- trunk/packages/invirt-base/python/invirt/common.py	(revision 3028)
+++ trunk/packages/invirt-base/python/invirt/common.py	(revision 3029)
@@ -83,9 +83,10 @@
         kwargs['stdout'] = subprocess.PIPE
     if 'stderr' not in kwargs:
-        kwargs['stderr'] = subprocess.STDOUT
+        kwargs['stderr'] = subprocess.PIPE
     p = subprocess.Popen(popen_args, *args, **kwargs)
-    out, _ = p.communicate(stdin_str)
+    out, err = p.communicate(stdin_str)
     if p.returncode:
-        raise subprocess.CalledProcessError(p.returncode, popen_args, out)
+        raise subprocess.CalledProcessError(p.returncode, '%s, stdout: %s, stderr: %s' %
+                                            (popen_args, out, err))
     return out