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  1. JDK
  2. JDK-8037342

parallelLockMap keeps growing

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Details

    • Bug
    • Status: Resolved
    • P3
    • Resolution: Won't Fix
    • 7u51, 9
    • None
    • core-libs

    Description

      FULL PRODUCT VERSION :
      java version "1.7.0_51"
      Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
      Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      Linux hpslim.skynet 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux


      A DESCRIPTION OF THE PROBLEM :
      I have a stress test case that shows that the field sun.misc.Launcher$AppClassLoader.parallelLockMap grows until "java.lang.OutOfMemoryError: Java heap space" happens, this error does not happen on version 1.6.0_27


      REGRESSION. Last worked in version 6u43

      ADDITIONAL REGRESSION INFORMATION:
      java version "1.6.0_27"
      OpenJDK Runtime Environment (IcedTea6 1.12.6) (6b27-1.12.6-1ubuntu0.12.04.4)
      OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      java -ea -XX:MaxPermSize=30m -Xms8m -Xmx64m -XX:+HeapDumpOnOutOfMemoryError test01


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      on 1.6.0_27 the program cleanly exit with "all done" message

      ACTUAL -
      java.lang.OutOfMemoryError: Java heap space
      Dumping heap to java_pid27708.hprof ...
      Heap dump file created [87922226 bytes in 0.956 secs]
      Java heap space


      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      java.lang.OutOfMemoryError: Java heap space


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------

      import org.objectweb.asm.ClassWriter;
      import org.objectweb.asm.MethodVisitor;
      import org.objectweb.asm.Opcodes;
      import org.objectweb.asm.Type;
      import org.objectweb.asm.commons.GeneratorAdapter;
      import org.objectweb.asm.commons.Method;

      import java.lang.reflect.Constructor;

      public class test01 {
          void doit(String[] args) throws Exception {
              test01classmaker cm = new test01classmaker();
              ClassLoader thiscl = getClass().getClassLoader();
              test01cl clsloader = new test01cl(thiscl, cm);
              for (int i=0; i<1000000; i++) {
                  String className = String.format("Class%04d", i);
                  clsloader.loadClass(className);
                  if ((i % 1000) == 0) {
                      /* discard old class loader */
                      clsloader = new test01cl(thiscl, cm);
                  }
              }
          }
          public static void main(String[] args) throws Exception {
              try {
                  new test01().doit(args);
              } catch (OutOfMemoryError e) {
                  System.out.println(e.getMessage());
                  System.exit(1);
              }
              System.out.println("all done");
          }
          public String greeting() {
              return "";
          }
      }

      class test01classmaker implements Opcodes {
          byte[] makeClass(String className) {
              String superName = "test01";

              ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES + ClassWriter.COMPUTE_MAXS);
              cw.visit(V1_6, ACC_PUBLIC, className, null, superName, null);

              MethodVisitor mw = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
              mw.visitVarInsn(ALOAD, 0);
              mw.visitMethodInsn(INVOKESPECIAL, superName, "<init>", "()V");
              mw.visitInsn(RETURN);
              mw.visitMaxs(0,0);
              mw.visitEnd();

              mw = cw.visitMethod(ACC_PUBLIC, "greeting", "()Ljava/lang/String;", null, null);
              mw.visitLdcInsn(String.format("hello world! (from %s)", className));
              mw.visitInsn(ARETURN);
              mw.visitMaxs(0,0);
              mw.visitEnd();

              cw.visitEnd();

              return cw.toByteArray();
          }
      }

      class test01cl extends ClassLoader {
          test01classmaker cm;
          protected test01cl(ClassLoader parent, test01classmaker cm) {
              super(parent);
              this.cm = cm;
          }
          @Override
          protected Class<?> findClass(String name) throws ClassNotFoundException {
              Class<?> c;
              if (name.startsWith("Class") && Integer.parseInt(name.substring(5)) >= 0) {
                  byte[] code = cm.makeClass(name);
                  c = defineClass(name, code, 0, code.length);
              } else {
                  c = super.findClass(name);
              }
              return c;
          }
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      no known workaround


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            dholmes David Holmes
            webbuggrp Webbug Group
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            Dates

              Created:
              Updated:
              Resolved: