diff --git a/gcc/cfgexpand.cc b/gcc/cfgexpand.cc
index 49b91827e83..bb33c1b939e 100644
--- a/gcc/cfgexpand.cc
+++ b/gcc/cfgexpand.cc
@@ -4575,6 +4575,10 @@ expand_debug_expr (tree exp)
 	      || SYMBOL_REF_DECL (XEXP (op0, 0)) != exp)
 	    return NULL;
 	}
+      else if (VAR_P (exp)
+	       && is_global_var (exp)
+	       && symtab_node::get (exp) == NULL)
+	return NULL;
       else
 	op0 = copy_rtx (op0);
 
diff --git a/gcc/testsuite/gcc.dg/pr105630.c b/gcc/testsuite/gcc.dg/pr105630.c
new file mode 100644
index 00000000000..c39ca7dda27
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr105630.c
@@ -0,0 +1,22 @@
+/* PR debug/105630 */
+/* { dg-do compile { target pthread } } */
+/* { dg-options "-O1 -ftree-parallelize-loops=2 -fcompare-debug" } */
+
+int m;
+static int n;
+
+void
+foo (void)
+{
+  int *arr[] = { &n, &n, &n };
+  int unused = n;
+
+  m = 0;
+}
+
+void
+bar (int *arr, int i)
+{
+  while (i < 1)
+    arr[i++] = 1;
+}