diff -r 7aec3140c7b6 -r 1336d592e5b8 src/share/vm/c1/c1_LIR.cpp
--- a/src/share/vm/c1/c1_LIR.cpp	Thu Jul 12 15:30:06 2018 +0800
+++ b/src/share/vm/c1/c1_LIR.cpp	Fri Jul 13 14:14:12 2018 +0800
@@ -23,8 +23,8 @@
  */
 
 /*
- * This file has been modified by Loongson Technology in 2015. These
- * modifications are Copyright (c) 2015 Loongson Technology, and are made
+ * This file has been modified by Loongson Technology in 2015, 2018. These
+ * modifications are Copyright (c) 2015, 2018 Loongson Technology, and are made
  * available on the same license terms set forth above.
  */
 
@@ -2348,7 +2348,12 @@
 
 // LIR_OpProfileType
 void LIR_OpProfileType::print_instr(outputStream* out) const {
-  out->print("exact = "); exact_klass()->print_name_on(out);
+  out->print("exact = ");
+  if (exact_klass() == NULL) {
+    out->print("unknown");
+  } else {
+    exact_klass()->print_name_on(out);
+  }
   out->print("current = "); ciTypeEntries::print_ciklass(out, current_klass());
   mdp()->print(out);          out->print(" ");
   obj()->print(out);          out->print(" ");