JDK-7187260 : Fix jdk8 6346658 needs to be backported to jdk7
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.nio
  • Affected Version: 7
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • OS: windows_7
  • CPU: x86
  • Submitted: 2012-07-26
  • Updated: 2012-08-03
  • Resolved: 2012-07-26
Related Reports
Duplicate :  
JDK-6346658 - (se) Selector briefly spins when asynchronously closing a registered channel [win]
Description
FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :

  Bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7130796  describes a BLOCK in nio selector on windows.   This bug was incorrectly marked as a duplicate of http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6346658, which is a SPIN!

However 7130796 was correctly analysed and fixed by http://hg.openjdk.java.net/jdk8/tl/jdk/rev/7326971f09af
We have run jdk8 for sometime and it appears to confirm that the problem is fixed.   The fixer asked for confirmation before backporting to jdk 7, but the issue had been closed so no further comments could be added.

So I opened http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7173207  to give the report that the fix worked.  However the handler of that saw the incorrect link to 6346658 and just said that it had been fixed and back ported to 7.

However, if you look at the fix: http://hg.openjdk.java.net/jdk8/tl/jdk/rev/7326971f09af  then at the jdk7 source at  http://hg.openjdk.java.net/build-infra/jdk7/jdk/file/0f8da27a3ea3/src/windows/classes/sun/nio/ch/NativeThread.java   or  http://hg.openjdk.java.net/build-infra/jdk7/jdk/file/0f8da27a3ea3/src/share/classes/sun/nio/ch/NativeThreadSet.java    you can see that it has not been backported - at least not to open jdk.

We continue to get jdk7 servers blocking on this issue (not spinning) on windows.


REGRESSION.  Last worked in version 7


REPRODUCIBILITY :
This bug can be reproduced always.
Comments
EVALUATION 7130796 was a hang, 6346658 was a (brief) spin, both are symptoms of the same issue. That issue has been fixed in jdk8 and 7u6 as 6346658. You can find the 7u6 change here: http://hg.openjdk.java.net/jdk7u/jdk7u6/jdk/rev/f35dfb4114e7 7u6 has not been released yet but you can obtain the developer release preview releases of 7u from here: http://jdk7.java.net/download.html
26-07-2012