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  1. JDK
  2. JDK-8251544

CTW: C2 fails with assert(no_dead_loop) failed: dead loop detected

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 11, 15, 16
    • Fix Version/s: 16
    • Component/s: hotspot
    • Subcomponent:
    • Resolved In Build:
      b20

      Description

      [You probably need JDK-8251526 to compile CTW in current jdk/jdk]

      It does seem to happen only with ZGC. Parallel, G1, Shenandoah pass the test fine. I initially suspected -XX:-UseCompressedOops (set by ZGC) is the real reason, but G1 with -XX:-UseCompressedOops also passes.

      Note it uses a specially passivated JAR file (that has more <clinits> stripped out to expose more classes to CTW).

      $ cd test/hotspot/jtreg/testlibrary/ctw
      $ make
      $ cd dist
      $ wget http://cr.openjdk.java.net/~shade/8251544/mule-module-scripting-jruby-3.9.0.jar
      $ export JAVA_HOME=<point to fastdebug build>
      $ JAVA_OPTIONS="-XX:+UseZGC" ./ctw.sh mule-module-scripting-jruby-3.9.0.jar

       24 ConI === 0 [[ 966 25 583 48 595 571 644 632 620 161 174 187 352 589 577 565 626 638 650 ]] #int:1
       966 AddI === _ 966 24 [[ 966 ]] !orig=[965] !jvms: DominatorTreeBuilder::buildDominatorTree @ bci:441
      # To suppress the following error report, specify this argument
      # after -XX: or in .hotspotrc: SuppressErrorAt=/phaseX.cpp:923
      #
      # A fatal error has been detected by the Java Runtime Environment:
      #
      # Internal Error (/home/shade/trunks/jdk-jdk/src/hotspot/share/opto/phaseX.cpp:923), pid=1986699, tid=1986817
      # assert(no_dead_loop) failed: dead loop detected
      #
      # JRE version: OpenJDK Runtime Environment (16.0) (fastdebug build 16-internal+0-adhoc.shade.jdk-jdk)
      # Java VM: OpenJDK 64-Bit Server VM (fastdebug 16-internal+0-adhoc.shade.jdk-jdk, mixed mode, sharing, tiered, z gc, linux-amd64)
      # Problematic frame:
      # V [libjvm.so+0x14b73c0] PhaseGVN::dead_loop_check(Node*)+0x160

        Attachments

        1. hs_err_pid15946.log
          62 kB
        2. replay_pid15946.log
          176 kB
        3. test.jar
          2 kB

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              Assignee:
              chagedorn Christian Hagedorn
              Reporter:
              shade Aleksey Shipilev
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                Dates

                Created:
                Updated:
                Resolved: