diff --git a/apps/backend/clixon_backend_handle.c b/apps/backend/clixon_backend_handle.c
index c54f5b17..8c6373bc 100644
--- a/apps/backend/clixon_backend_handle.c
+++ b/apps/backend/clixon_backend_handle.c
@@ -202,6 +202,7 @@ backend_client_delete(clixon_handle        h,
                 free(ce->ce_transport);
             if (ce->ce_source_host)
                 free(ce->ce_source_host);
+            ce->ce_next = NULL;
             free(ce);
             break;
         }
diff --git a/lib/src/clixon_proc.c b/lib/src/clixon_proc.c
index c6b59212..1665b250 100644
--- a/lib/src/clixon_proc.c
+++ b/lib/src/clixon_proc.c
@@ -220,9 +220,7 @@ clixon_proc_socket(clixon_handle h,
         clixon_err(OE_UNIX, EINVAL, "argv[0] is NULL");
 	goto done;
     }
-
     clixon_debug(CLIXON_DBG_PROC, "%s...", argv[0]);
-
     for (argc = 0; argv[argc] != NULL; ++argc)
          ;
     if ((flattened = clicon_strjoin(argc, argv, "', '")) == NULL){
@@ -254,6 +252,7 @@ clixon_proc_socket(clixon_handle h,
         signal(SIGTSTP, SIG_IGN);
 
         close(sp[0]);
+        close(sperr[0]);
         close(0);
         if (dup2(sp[1], STDIN_FILENO) < 0){
             clixon_err(OE_UNIX, errno, "dup2(STDIN)");
@@ -273,15 +272,17 @@ clixon_proc_socket(clixon_handle h,
             }
             close(sperr[1]);
         }
+        close(sperr[1]);
         if (execvp(argv[0], argv) < 0){
             clixon_err(OE_UNIX, errno, "execvp(%s)", argv[0]);
             return -1;
         }
         exit(-1);        /* Shouldnt reach here */
     }
-    clixon_debug(CLIXON_DBG_PROC | CLIXON_DBG_DETAIL, "child %u sock %d", child, sp[0]);
+    clixon_debug(CLIXON_DBG_PROC, "child %u sock %d", child, sp[0]);
     /* Parent */
     close(sp[1]);
+    close(sperr[1]);
     *pid = child;
     *sock = sp[0];
     if (sockerr)
@@ -308,7 +309,6 @@ clixon_proc_socket_close(pid_t pid,
     int status;
 
     clixon_debug(CLIXON_DBG_PROC, "pid %u sock %d", pid, sock);
-
     if (sock != -1)
         close(sock); /* usually kills */
     kill(pid, SIGTERM);
diff --git a/lib/src/clixon_xpath_ctx.c b/lib/src/clixon_xpath_ctx.c
index d290f3d3..d82b856d 100644
--- a/lib/src/clixon_xpath_ctx.c
+++ b/lib/src/clixon_xpath_ctx.c
@@ -319,6 +319,9 @@ ctx2number(xp_ctx *xc,
 }
 
 /*! Replace a nodeset of a XPath context with a new nodeset 
+ *
+ * @param[in] vec    XML vector, is consumed
+ * @param[in] veclen
  */
 int
 ctx_nodeset_replace(xp_ctx   *xc,
diff --git a/lib/src/clixon_xpath_eval.c b/lib/src/clixon_xpath_eval.c
index c00593cc..617e2a56 100644
--- a/lib/src/clixon_xpath_eval.c
+++ b/lib/src/clixon_xpath_eval.c
@@ -371,6 +371,8 @@ xp_eval_step(xp_ctx     *xc0,
             }
         }
         ctx_nodeset_replace(xc, vec, veclen);
+        if (vec)
+            vec = NULL;
         break;
     case A_DESCENDANT_OR_SELF:
         for (i=0; i<xc->xc_size; i++){
@@ -705,6 +707,7 @@ xp_numop(xp_ctx    *xc1,
  * Move to clixon_xml.c?
  * As a side-effect sets the cache.
  * Clear cache with xml_cv_set(x, NULL)
+ * @see xml_cv_cache.c duplicated function
  */
 static int
 xml_cv_cache(cxobj   *x,
diff --git a/lib/src/clixon_xpath_optimize.c b/lib/src/clixon_xpath_optimize.c
index 3cc368b0..8d3e0ab6 100644
--- a/lib/src/clixon_xpath_optimize.c
+++ b/lib/src/clixon_xpath_optimize.c
@@ -345,6 +345,10 @@ xpath_optimize_check(xpath_tree *xs,
     else if ((ret = xpath_list_optimize_fn(xs, xv, xvec)) < 0)
         goto done;
     else if (ret == 1){
+        if (xvec0 && *xvec0){
+            free(*xvec0);
+            *xvec0 = NULL;
+        }
         if (clixon_xvec_extract(xvec, xvec0, xlen0, NULL) < 0){
             goto done;
         }
diff --git a/lib/src/clixon_yang.c b/lib/src/clixon_yang.c
index d48b41e5..318ebaf6 100644
--- a/lib/src/clixon_yang.c
+++ b/lib/src/clixon_yang.c
@@ -380,11 +380,8 @@ yang_ref_dec(yang_stmt *ys)
 {
     int retval = -1;
     
-    if (ys->ys_ref <= 0){
-        clixon_err(OE_YANG, 0, "reference count is %d cannot decrement", ys->ys_ref);
-        goto done;
-    }
-    ys->ys_ref--;
+    if (ys->ys_ref > 0)
+        ys->ys_ref--;
     retval = 0;
  done:
     return retval;
diff --git a/lib/src/clixon_yang_schema_mount.c b/lib/src/clixon_yang_schema_mount.c
index efbfa4ab..8c96e897 100644
--- a/lib/src/clixon_yang_schema_mount.c
+++ b/lib/src/clixon_yang_schema_mount.c
@@ -257,10 +257,7 @@ yang_mount_set(yang_stmt *y,
     if ((cvv = yang_cvec_get(y)) != NULL &&
         (cv = cvec_find(cvv, xpath)) != NULL &&
         (yspec0 = cv_void_get(cv)) != NULL){
-#if 0 /* Problematic to free yang specs here, upper layers should handle it? */
         ys_free(yspec0);
-#endif
-        yang_ref_dec(yspec0);
         cv_void_set(cv, NULL);
     }
     else if ((cv = yang_cvec_add(y, CGV_VOID, xpath)) == NULL)