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  1. JDK
  2. JDK-8145091

JMAP fails to dump huge arrays



    • Bug
    • Status: Resolved
    • P3
    • Resolution: Duplicate
    • 9
    • 9
    • hotspot
    • None
    • svc


      When trying to dump large arrays, jmap fails in various ways:


      public class Test {
        public static void main(String[] args) throws Exception {
          byte[] something = new byte[2 * 1024 * 1024 * 1024 - 30];
      fails in the jmap process with a "file size limit" message when run with

      java -Xmx12g Test.java


      jmap -J-d64 -J-XX:SegmentedHeapDumpThreshold=2M -dump:format=b,file=heap.bin

      on linux/x64.
      (Note the forced segmentation too, but there does not seem to be a reason why writing a ~2G object would fail on a 64 bit system; it also fails without the SegmentedHeapDumpThreshold set)

      This code:

      public class Test {
        public static void main(String[] args) throws Exception {
          int[] something = new int[2 * 1024 * 1024 * 1024 - 30];

      crashes the VM to be dumped with

      # To suppress the following error report, specify this argument
      # after -XX: or in .hotspotrc: SuppressErrorAt=/heapDumper.cpp:1043
      # A fatal error has been detected by the Java Runtime Environment:
      # INVALID (0xe0000000) at pc=0x0000000000000000, pid=2168, tid=2236
      # assert(length_in_bytes > 0) failed: nothing to copy
      # JRE version: Java(TM) SE Runtime Environment (9.0) (build 9-internal+0-2015-12-10-095457.tschatzl.hs-gc)
      # Java VM: Java HotSpot(TM) 64-Bit Server VM (9-internal+0-2015-12-09-143703.tschatzl.hs-gc, mixed mode, tiered, compressed oops, g1 gc, linux-amd64)
      # Core dump will be written. Default location: Core dumps may be processed with "/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e %P %I" (or dumping to ...)
      # An error report file with more information is saved as:
      # .../hs_err_pid2168.log
      # If you would like to submit a bug report, please visit:
      # http://bugreport.java.com/bugreport/crash.jsp

      and the jmap process errors out with
      Exception in thread "main" java.io.IOException: Premature EOF
      at sun.tools.attach.HotSpotVirtualMachine.readInt(HotSpotVirtualMachine.java:294)
      at sun.tools.attach.VirtualMachineImpl.execute(VirtualMachineImpl.java:199)
      at sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:263)
      at sun.tools.attach.HotSpotVirtualMachine.dumpHeap(HotSpotVirtualMachine.java:226)
      at sun.tools.jmap.JMap.dump(JMap.java:247)
      at sun.tools.jmap.JMap.main(JMap.java:142)

      (same command line)


        Issue Links



              aeriksso Andreas Eriksson (Inactive)
              tschatzl Thomas Schatzl
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