diff --git a/.hgtags b/.hgtags
index 25bd92ea5ece113b267f3b5ea8f979a48a2a1095..0f3c57e05667fb9a62171f08bc7d933c4783320a 100644
--- a/.hgtags
+++ b/.hgtags
@@ -904,6 +904,7 @@ e4525db272634b980738003eff99ac1588bb79d3 jdk8u111-b05
 019b22dd8128840ecdcd1bfebcf4447e28e45068 jdk8u111-b06
 3f337aaf090769653ee0a746fbe661d09055a883 jdk8u111-b07
 e180e364a40364a059a20c74b97ab4e928e2b676 jdk8u111-b08
+c48b303692bb86c42e928da6dec815e901a24c5b jdk8u111-b09
 b09a69142dd3bf78ca66bb0c99046ca7cccbdda9 jdk8u112-b00
 cf1faa9100dd8c8df6e1a604aaf613d037f51ebf jdk8u112-b01
 f22b5be95347c669a1463d9e05ec3bf11420208e jdk8u112-b02
diff --git a/src/share/vm/prims/jvm.cpp b/src/share/vm/prims/jvm.cpp
index f1ed8d6f98dc91185b7c4b754cbe323e2c0c78d9..f1b13f2b16d991cbb1383f2bf7a7b86e9ab4bd28 100644
--- a/src/share/vm/prims/jvm.cpp
+++ b/src/share/vm/prims/jvm.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2872,7 +2872,18 @@ ATTRIBUTE_PRINTF(3, 0)
 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
   // see bug 4399518, 4417214
   if ((intptr_t)count <= 0) return -1;
-  return vsnprintf(str, count, fmt, args);
+
+  int result = vsnprintf(str, count, fmt, args);
+  // Note: on truncation vsnprintf(3) on Unix returns number of
+  // characters which would have been written had the buffer been large
+  // enough; on Windows, it returns -1. We handle both cases here and
+  // always return -1, and perform null termination.
+  if ((result > 0 && (size_t)result >= count) || result == -1) {
+    str[count - 1] = '\0';
+    result = -1;
+  }
+
+  return result;
 }
 
 ATTRIBUTE_PRINTF(3, 0)
diff --git a/src/share/vm/runtime/deoptimization.cpp b/src/share/vm/runtime/deoptimization.cpp
index 141d06d77cb38d69fe2dbb896439565477f18e3c..387a31c523ecbbb0bf53749ad5c208117d61c822 100644
--- a/src/share/vm/runtime/deoptimization.cpp
+++ b/src/share/vm/runtime/deoptimization.cpp
@@ -1881,8 +1881,6 @@ const char* Deoptimization::format_trap_state(char* buf, size_t buflen,
                        trap_reason_name(reason),
                        recomp_flag ? " recompiled" : "");
   }
-  if (len >= buflen)
-    buf[buflen-1] = '\0';
   return buf;
 }
 
@@ -1952,8 +1950,6 @@ const char* Deoptimization::format_trap_request(char* buf, size_t buflen,
     len = jio_snprintf(buf, buflen, "reason='%s' action='%s' index='%d'",
                        reason, action, unloaded_class_index);
   }
-  if (len >= buflen)
-    buf[buflen-1] = '\0';
   return buf;
 }
 
diff --git a/src/share/vm/runtime/java.cpp b/src/share/vm/runtime/java.cpp
index f1444d4a29e96907a622f66590745da645bfc900..faec9bae95ca1ff72d50bd2815da95a9a1daa630 100644
--- a/src/share/vm/runtime/java.cpp
+++ b/src/share/vm/runtime/java.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -773,25 +773,36 @@ int JDK_Version::compare(const JDK_Version& other) const {
 }
 
 void JDK_Version::to_string(char* buffer, size_t buflen) const {
+  assert(buffer && buflen > 0, "call with useful buffer");
   size_t index = 0;
   if (!is_valid()) {
     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
   } else if (is_partially_initialized()) {
     jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
   } else {
-    index += jio_snprintf(
+    int rc = jio_snprintf(
         &buffer[index], buflen - index, "%d.%d", _major, _minor);
+    if (rc == -1) return;
+    index += rc;
     if (_micro > 0) {
-      index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
+      rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
+      if (rc == -1) return;
+      index += rc;
     }
     if (_update > 0) {
-      index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
+      rc = jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
+      if (rc == -1) return;
+      index += rc;
     }
     if (_special > 0) {
-      index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
+      rc = jio_snprintf(&buffer[index], buflen - index, "%c", _special);
+      if (rc == -1) return;
+      index += rc;
     }
     if (_build > 0) {
-      index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
+      rc = jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
+      if (rc == -1) return;
+      index += rc;
     }
   }
 }