8245801: StressRecompilation triggers assert "redundunt OSR recompilation detected. memory leak in CodeCache!"

Assert is too strong.

Backport-of: 76ac621

Author: Olga Mikhaltsova

src/hotspot/share/oops/instanceKlass.cpp

@@ -2995,9 +2995,9 @@ void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
 void InstanceKlass::add_osr_nmethod(nmethod* n) {
 #ifndef PRODUCT
   if (TieredCompilation) {
-      nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
-      assert(prev == NULL || !prev->is_in_use(),
-      "redundunt OSR recompilation detected. memory leak in CodeCache!");
+    nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
+    assert(prev == NULL || !prev->is_in_use() || StressRecompilation,
+           "redundant OSR recompilation detected. memory leak in CodeCache!");
   }
 #endif
   // only one compilation can be active

test/hotspot/jtreg/compiler/c2/TestStressRecompilation.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8245801
+ * @requires vm.debug
+ * @summary Test running with StressRecompilation enabled.
+ * @run main/othervm -Xcomp -XX:+IgnoreUnrecognizedVMOptions -XX:+StressRecompilation
+ *                   compiler.c2.TestStressRecompilation
+ */
+
+package compiler.c2;
+
+public class TestStressRecompilation {
+
+    public static void main(String[] args) {
+        System.out.println("Test passed.");
+    }
+}