Index: src/main/java/hudson/scm/SubversionSCM.java
===================================================================
--- src/main/java/hudson/scm/SubversionSCM.java	(revision 29879)
+++ src/main/java/hudson/scm/SubversionSCM.java	(working copy)
@@ -740,6 +740,12 @@
                             svnuc.doCheckout(l.getSVNURL(), local.getCanonicalFile(), SVNRevision.HEAD, getRevision(l), SVNDepth.INFINITY, true);
                         } catch (SVNException e) {
                             e.printStackTrace(listener.error("Failed to check out "+l.remote));
+                            pos.close();
+                            try {
+                                sct.join(); // wait for all data to be piped.
+                            } catch (InterruptedException ie) {
+                                throw new IOException2("interrupted",ie);
+                            }
                             return null;
                         }
                     }