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  1. JDK
  2. JDK-6716441

error in meet with +DoEscapeAnalysis

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    Details

    • Subcomponent:
    • Resolved In Build:
      b01
    • CPU:
      sparc
    • OS:
      solaris_9
    • Verification:
      Verified

      Backports

        Description

        The report for 6589823 includes a test case which fails with meet not symmetric but it's failing for different reasons. From the comments of that report:

        Please see Tester.java class generated by JITTester which fails the same
        way starting from HS12-b03 (jdk7b26). The error is:

        === Meet Not Symmetric ===
        t = narrowoop: Tester_Class_2:TopPTR:exact *[int:48]:AnyNull:exact *,iid=-58
        this= Tester_Class_0:AnyNull *
        mt=(t meet this)= java/lang/Object:NotNull:exact *,iid=-58
        t_dual= narrowoop: Tester_Class_2:exact *[int:48]:NotNull:exact *,iid=58
        this_dual= Tester_Class_0:NotNull *
        mt_dual= java/lang/Object:AnyNull:exact *,iid=58
        mt_dual meet t_dual= narrowoop: Tester_Class_2:exact *[int:48]:NotNull:exact *
        mt_dual meet this_dual= java/lang/Object:NotNull *
        # To suppress the following error report, specify this argument
        # after -XX: or in .hotspotrc: SuppressErrorAt=/type.cpp:541
        #
        # A fatal error has been detected by the Java Runtime Environment:
        #
        # Internal Error (/BUILD_AREA/jdk7/hotspot/src/share/vm/opto/type.cpp:541), pid=12905, tid=1083214144
        # Error: meet not symmetric
        #


        The problem is not reproduced with HS12-b01 (jdk7b25).
        The problem is -XX:+AggressiveOpts specific.

        To reproduce the problem do something like:
        1. ssh linux-amd64 machine
        2. javac Tester.java
        3. /net/sqenfs-1.sfbay/export1/jdk/re/7/promoted/all/b27/binaries/linux-amd64/fastdebug/bin/java -Xcomp -d64 -server -XX:+AggressiveOpts Tester

        Running with +DoEscapeAnalysis alone it fails like this with current c2_baseline:

        java -d64 -XX:+DoEscapeAnalysis -Xcomp Tester VM option '+DoEscapeAnalysis'
        === Meet Not Symmetric ===
        t = Tester_Class_2:TopPTR:exact *[int:48]:AnyNull:exact *,iid=-55
        this= Tester_Class_0:AnyNull *
        mt=(t meet this)= java/lang/Object:NotNull:exact *,iid=-55
        t_dual= Tester_Class_2:exact *[int:48]:NotNull:exact *,iid=55
        this_dual= Tester_Class_0:NotNull *
        mt_dual= java/lang/Object:AnyNull:exact *,iid=55
        mt_dual meet t_dual= Tester_Class_2:exact *[int:48]:NotNull:exact *
        mt_dual meet this_dual= java/lang/Object:NotNull *
        # To suppress the following error report, specify this argument
        # after -XX: or in .hotspotrc: SuppressErrorAt=/type.cpp:552
        #
        # A fatal error has been detected by the Java Runtime Environment:
        #
        # Internal Error (/net/smite.sfbay/export/ws/baseline/src/share/vm/opto/type.cpp:552), pid=16221, tid=9
        # Error: meet not symmetric
        #
        # Java VM: OpenJDK 64-Bit Server VM (13.0-b01-never-baseline-jvmg compiled mode solaris-sparc )
        # An error report file with more information is saved as:
        # /never/hs_err_pid16221.log
        #
        # If you would like to submit a bug report, please visit:
        # http://java.sun.com/webapps/bugreport/crash.jsp
        #
        Current thread is 9
        Dumping core ...
        Abort (core dumped)

        I think the problem is that mt, which is the value we're going to return, has an instance id which seems like it should have been stripped during the meet.

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                Assignee:
                kvn Vladimir Kozlov
                Reporter:
                never Tom Rodriguez
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