Fix (APAR):  PQ81567

Status:  Fix

Release:  5.1.0,5.0.2.2,5.0.2.1,5.0.2,5.0.1,5.0.0

Operating System:  All

Supersedes Fixes:  

CMVC Defect:  PQ81567

Byte size of APAR:  53551

Date: 2003-12-03

Abstract:  NodeAgent crashes after repeated start/stop of clusters and/or servers

Description/symptom of problem:  The problem is a timing window issue when servers are started by a nodeagent in an multi-node configuration.  If the servers are stopped within the first twenty minutes after they are started, there is a potential crash that may occur due to memory getting deallocated while it is still in use.  The window is fairly narrow, but it can be hit.  

A common way to reproduce it is to create a cluster of servers, start them, then when it reports all servers are up, stop the cluster.  Do it repeatedly and you will eventually hit the problem.  It may happen within the first few restarts, or it may take days or repeated start/stops within the twenty minute window.

Directions to apply fix:  NOTE:  YOU MUST FIRST DOWNLOAD THE UPDATE INSTALLER TOOL IN ORDER TO INSTALL A FIX.
       The Fix Installer can be downloaded from the following link:
       http://www-3.ibm.com/software/webservers/appserv/support/index.html

1) Create temporary "fix" directory to store the jar file:
             UNIX: /tmp/WebSphere/fix
          Windows: c:\temp\WebSphere\fix

2) Copy jar file to the directory.  The one ending with _50X.jar is for 5.0.X versions of the product.  The one ending in _51X.jar is for 5.1.0.  Please copy the one appropriate to your product.

3) Shutdown WebSphere

4) Follow the Fix installation instructions that are packaged with the Fix Installer on how to install the Fix.

5) Restart WebSphere

6) The temp directory may be removed.

Directions to remove fix:  
NOTE:  FIXES MUST BE REMOVED IN THE ORDER THEY WERE APPLIED.  DO NOT REMOVE A FIX UNLESS
     ALL FIXES APPLIED AFTER IT HAVE FIRST BEEN REMOVED.  YOU MAY REAPPLY ANY REMOVED FIX.

Example:  If your system has fix1, fix2, and fix3 applied in that order and fix2 is to be
          removed, fix3 must be removed first, fix2 removed, and fix3 re-applied.


1) Shutdown WebSphere

2) Follow the instructions that are packaged with the Fix Installer on how to uninstall the Fix.

3) Restart WebSphere

Directions to re-apply fix:  
1) Shutdown WebSphere

2) Follow the Fix instructions that are packaged with the Fix Installer on how to uninstall and reinstall the Fix.

3) Restart WebSphere



Additional Information: