title: Java crash SIGSEGV (0xb) on Java 8
body: <p>Running a minecraft server on a Debian 7 64 Bit machine.
  Oracle Java 8_05 JRE 64 bit is installed.
  Since some time the server crashes twice or more times a day.</p>
  
  <p>Java crash report:</p>
  
  <pre><code>#
  # A fatal error has been detected by the Java Runtime Environment:
  #
  #  SIGSEGV (0xb) at pc=0x00007f0921139a9c, pid=25246, tid=139676902000384
  #
  # JRE version: Java(TM) SE Runtime Environment (8.0_05-b13) (build 1.8.0_05-b13)
  # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.5-b02 mixed mode linux-amd64 compressed oops)
  # Problematic frame:
  # V  [libjvm.so+0x555a9c]  G1ParCopyClosure&lt;false, (G1Barrier)2, false&gt;::copy_to_survivor_space(oopDesc*)+0x3c
  #
  # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
  #
  # If you would like to submit a bug report, please visit:
  #   http://bugreport.sun.com/bugreport/crash.jsp
  #
  </code></pre>
  
  <p>How can I solve it?</p>
  
  <p>Forgot to mention that I use these start parameters:</p>
  
  <pre><code>    SERVICE="spigot.jar"
      MEMLOG="memory.log"
      SCREEN="classic"
      CPU_COUNT=4
      INITMEM="2048M"
      MAXMEM="12G"
      INVOCATION="java -Xms$INITMEM -Xmx$MAXMEM -XX:+AggressiveOpts - XX:ParallelGCThreads=$CPU_COUNT -XX:+UseG1GC -XX:MaxGCPauseMillis=100 -Xloggc:$MEMLOG -jar $SERVICE nogui -o false"
  </code></pre>
  
  <p>screen -dmS $SCREEN $INVOCATION  </p>
  
  <p>Anything that could cause the trouble? Maybe the GC flag?</p>