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  1. JDK
  2. JDK-8156708

Intermittent hangs/timeouts on SPARC in G1 since 9-b99

    Details

    • Subcomponent:
    • Introduced In Build:
      b99
    • Introduced In Version:
      9
    • CPU:
      sparc
    • OS:
      solaris

      Description

      We've intermittently seen long timeouts on various startup benchmarks when running with G1 on SPARC since 9-b99.

      From pstack output from a core dump taken from a java -version hanging on SPARC on a more recent binary:

      ffffffff683b51e8 JVM_MonitorWait (100a529c8, 0, ea60, 100a52000, ffffffff68ede750, 100a529d0) + 2c8
       ffffffff57c102d8 * java/lang/Object.wait(J)V+-8672
       ffffffff57c1027c * java/lang/Object.wait(J)V+-2760
       ffffffff57c08b88 * java/lang/ref/ReferenceQueue.remove(J)Ljava/lang/ref/Reference;+59
       ffffffff57c088f8 * jdk/internal/ref/CleanerImpl.run()V+65
       ffffffff57c08bd4 * java/lang/Thread.run()V+11
       ffffffff57c08b88 * jdk/internal/misc/InnocuousThread.run()V+20
       ffffffff57c0036c * StubRoutines (1)

      Seems something might be up with the cleaner introduced in JDK-8138696 (and further improved in JDK-8146038), which now features an innocuous and tenacious thread that doesn't like being interrupted:

                  try {
                      // Wait for a Ref, with a timeout to avoid getting hung
                      // due to a race with clear/clean
                      Cleanable ref = (Cleanable) queue.remove(60 * 1000L);
                      if (ref != null) {
                          ref.clean();
                      }
                  } catch (Throwable e) {
                      // ignore exceptions from the cleanup action
                      // (including interruption of cleanup thread)
                  }

      Trivial reproducer (on a SPARC T4-1 this is very likely to hang for ~60s after around 10-20 executions):

      for i in {1..100}; do java -version; done

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              • Assignee:
                dholmes David Holmes
                Reporter:
                redestad Claes Redestad
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                • Created:
                  Updated:
                  Resolved: