<div dir="ltr">Unfortunately, we cannot provide the test publicly.<div>But we do have internal tests that triggers this bug, and got fixed with this patch.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 4, 2015 at 9:25 AM, Jon Masamitsu <span dir="ltr"><<a href="mailto:jon.masamitsu@oracle.com" target="_blank">jon.masamitsu@oracle.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF" text="#000000"><span class="">
    <br>
    <br>
    <div>On 11/3/2015 5:32 PM, Jungwoo Ha wrote:<br>
    </div>
    <blockquote type="cite">
      <div dir="ltr">Somehow I didn't receive Jon's email.
        <div>We've first noticed this on JDK8, but I think the bug is
          more triggered with the tcmalloc + custom launcher.</div>
        <div><br>
        </div>
      </div>
    </blockquote>
    <br></span>
    Jungwoo,<br>
    <br>
    Do you have a test that exhibits the bug?<span class="HOEnZb"><font color="#888888"><br>
    <br>
    Jon</font></span><span class=""><br>
    <br>
    <blockquote type="cite">
      <div dir="ltr">
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Tue, Nov 3, 2015 at 4:14 PM, Carsten
          Varming <span dir="ltr"><<a href="mailto:varming@gmail.com" target="_blank">varming@gmail.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="ltr">Dear Jon,
              <div><br>
              </div>
              <div>I am pretty sure this has been that way for a long
                time. I have never seen a problem, but I would like to
                see Hotspot shut down its threads as well.</div>
              <div><br>
              </div>
              <div>Carsten</div>
            </div>
            <div class="gmail_extra"><br>
              <div class="gmail_quote">On Tue, Nov 3, 2015 at 5:40 PM,
                Jon Masamitsu <span dir="ltr"><<a href="mailto:jon.masamitsu@oracle.com" target="_blank"></a><a href="mailto:jon.masamitsu@oracle.com" target="_blank">jon.masamitsu@oracle.com</a>></span>
                wrote:<br>
                <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                  <div text="#000000" bgcolor="#FFFFFF"> <font face="Times New Roman, Times, serif">Jungwoo,<br>
                      <br>
                      Did you first see this bug in jdk8?  I'm wondering
                      if it<br>
                      was always broken.<span><font color="#888888"><br>
                          <br>
                          Jon<br>
                        </font></span></font>
                    <div>
                      <div>
                        <div>
                          <div><br>
                            <div>On 11/03/2015 01:14 PM, Jungwoo Ha
                              wrote:<br>
                            </div>
                            <blockquote type="cite">
                              <div dir="ltr">BUG: <a href="https://bugs.openjdk.java.net/browse/JDK-8141356" target="_blank"></a><a href="https://bugs.openjdk.java.net/browse/JDK-8141356" target="_blank">https://bugs.openjdk.java.net/browse/JDK-8141356</a>
                                <div>Webrev: <a href="http://cr.openjdk.java.net/%7Ejwha/8141356/webrev.00/" target="_blank">http://cr.openjdk.java.net/~jwha/8141356/webrev.00/</a></div>
                                <div><br>
                                </div>
                                <div>
                                  <div>Inside before_exit(), it says </div>
                                  <div><br>
                                  </div>
                                  <div><font face="monospace, monospace"> 
                                      // Stop concurrent GC threads </font></div>
                                  <div><font face="monospace, monospace"> 
                                      Universe::heap()->stop(); </font></div>
                                  <div><br>
                                  </div>
                                  <div>but GenCollectedHeap never
                                    implemented stop() method, and thus
                                    calling empty SharedHeap::stop()
                                    method. </div>
                                  <div>This causes CMS threads to run
                                    during the VM termination and ends
                                    up crashing. <br>
                                  </div>
                                  <div><span style="color:rgb(0,0,0);white-space:pre-wrap">ConcurrentMarkSweepThread::stop() is currently a dead code and never gets called.</span><br>
                                  </div>
                                  <div><span style="color:rgb(0,0,0);white-space:pre-wrap">The patch just implemented GenCollectedHeap::stop() to call </span><span style="color:rgb(0,0,0);white-space:pre-wrap">ConcurrentMarkSweepThread::stop().</span></div>
                                  <div><br>
                                  </div>
                                  <div>Can someone sponsor this patch?</div>
                                  <div><br>
                                  </div>
                                  -- <br>
                                  <div>
                                    <div dir="ltr">
                                      <div><span style="font-size:12.8px">Jungwoo
                                          Ha | Google | <a href="mailto:jwha@google.com" target="_blank"></a><a href="mailto:jwha@google.com" target="_blank">jwha@google.com</a></span><br>
                                      </div>
                                      <div><br>
                                      </div>
                                    </div>
                                  </div>
                                </div>
                              </div>
                            </blockquote>
                            <br>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </blockquote>
              </div>
              <br>
            </div>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <div><br>
        </div>
        -- <br>
        <div>
          <div dir="ltr">
            <div><span style="font-size:12.8000001907349px">Jungwoo Ha |
                Java Platform Team | <a href="mailto:jwha@google.com" target="_blank">jwha@google.com</a></span><br>
            </div>
            <div><br>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    <br>
  </span></div>

</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><span style="font-size:12.8000001907349px">Jungwoo Ha | Java Platform Team | <a href="mailto:jwha@google.com" target="_blank">jwha@google.com</a></span><br></div><div><br></div></div></div>
</div>