Details

    • Type: Sub-task
    • Status: Closed
    • Priority: Blocker
    • Resolution: Won't Fix
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None
    • Environment:

      Operating System: Windows
      Platform: PC

    • Bugzilla Id:
      112

      Description

      When you run logging into same file from many threads on a system that has more than one physical processor (Dual Core for example), a deadlock will occur after a while. This can not be reproduced on HyperThreading processors. Here's an example program that will demonstrate the behavior:

      -----------------------------
      Main.java
      -----------------------------

      import java.util.Date;
      import java.util.concurrent.ScheduledThreadPoolExecutor;
      import java.util.concurrent.TimeUnit;

      import org.slf4j.Logger;
      import org.slf4j.LoggerFactory;

      import ch.qos.logback.classic.LoggerContext;
      import ch.qos.logback.classic.joran.JoranConfigurator;
      import ch.qos.logback.core.joran.spi.JoranException;

      public class Main extends Thread
      {
      private final static String LOGGER_CONFIGURATION_FILE = "logger.xml";
      private final Logger logger = LoggerFactory.getLogger(Main.class);

      private final long start;

      public Main()
      throws JoranException

      { start = new Date().getTime(); LoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory(); JoranConfigurator configurator = new JoranConfigurator(); lc.shutdownAndReset(); configurator.setContext(lc); configurator.doConfigure(LOGGER_CONFIGURATION_FILE); }

      public void start()

      { ScheduledThreadPoolExecutor ex1 = new ScheduledThreadPoolExecutor(1); ScheduledThreadPoolExecutor ex2 = new ScheduledThreadPoolExecutor(1); ScheduledThreadPoolExecutor ex3 = new ScheduledThreadPoolExecutor(1); ScheduledThreadPoolExecutor ex4 = new ScheduledThreadPoolExecutor(1); ScheduledThreadPoolExecutor ex5 = new ScheduledThreadPoolExecutor(1); ex1.scheduleAtFixedRate(new Task("EX1"), 10, 10, TimeUnit.MICROSECONDS); ex2.scheduleAtFixedRate(new Task("EX2"), 10, 10, TimeUnit.MICROSECONDS); ex3.scheduleAtFixedRate(new Task("EX3"), 10, 10, TimeUnit.MICROSECONDS); ex4.scheduleAtFixedRate(new Task("EX4"), 10, 10, TimeUnit.MICROSECONDS); ex5.scheduleAtFixedRate(new Task("EX5"), 10, 10, TimeUnit.MICROSECONDS); super.start(); }

      public void run()
      {
      try
      {
      while(true)
      {
      logger.debug("[MAIN] {}", new Date().getTime() - start);
      Thread.sleep(10);
      }
      }
      catch (InterruptedException e)
      {
      logger.info("[MAIN]: Interrupted: {}", e.getMessage());
      }
      }

      public static void main(String[] args)
      {
      try

      { Main main = new Main(); main.start(); }

      catch (JoranException e)

      { System.out.println("Failed to load application: " + e.getMessage()); }

      }
      }

      -------------------------------
      Task.java
      -------------------------------

      import java.util.Date;

      import org.slf4j.Logger;
      import org.slf4j.LoggerFactory;

      public class Task implements Runnable
      {
      private final Logger logger = LoggerFactory.getLogger(Task.class);
      private final Logger logger_main = LoggerFactory.getLogger(Main.class);
      private final String name;
      private final long start;

      public Task(final String name)

      { this.name = name; start = new Date().getTime(); }

      public void run()
      {
      logger.debug("[{}] {}", name, new Date().getTime() - start);
      logger_main.debug("[MAIN] - [{}] {}", name, new Date().getTime() - start);
      }
      }

        Attachments

        1. AppenderBaseLock.patch
          1 kB
        2. patch.txt
          16 kB
        3. patch2.txt
          85 kB
        4. patch3.txt
          25 kB

          Activity

            People

            • Assignee:
              ceki Ceki Gülcü
              Reporter:
              to_heim Toni Heimala
            • Votes:
              4 Vote for this issue
              Watchers:
              6 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: