PK55228: WEBSPHERE APPLICATION SERVER FOR Z/OS IS INTERMITTENTLY CLOSING SOME HAMANAGER SOCKETS CAUSING THE HAMANAGER COMPONENT TO HANG.

 Fixes are available

6.1.0.15 WebSphere Application Server V6.1 Fix Pack 15 for i5/OS
6.1.0.13 WebSphere Application Server V6.1 Fix Pack 13 for AIX
6.1.0.15 WebSphere Application Server V6.1 Fix Pack 15 for AIX
6.1.0.15: WebSphere Application Server V6.1 Fix Pack 15 for HP-UX
6.1.0.15: WebSphere Application Server V6.1 Fix Pack 15 for Windows
6.1.0.13: WebSphere Application Server V6.1 Fix Pack 13 for Windows
6.1.0.17 WebSphere Application Server V6.1 Fix Pack 17 for i5/OS
6.1.0.13: WebSphere Application Server V6.1 Fix Pack 13 for i5/OS
6.1.0.13: WebSphere Application Server V6.1 Fix Pack 13 for HP-UX
6.1.0.17: WebSphere Application Server V6.1 Fix Pack 17 for Linux
6.1.0.17: WebSphere Application Server V6.1 Fix Pack 17 for Solaris
6.1.0.17: WebSphere Application Server V6.1 Fix Pack 17 for HP-UX
6.1.0.17: WebSphere Application Server V6.1 Fix Pack 17 for Windows
6.1.0.17 WebSphere Application Server V6.1 Fix Pack 17 for AIX
6.1.0.13: WebSphere Application Server V6.1 Fix Pack 13 for Solaris
6.1.0.15: WebSphere Application Server V6.1 Fix Pack 15 for Linux
6.1.0.15: WebSphere Application Server V6.1 Fix Pack 15 for Solaris
6.1.0.13: WebSphere Application Server V6.1 Fix Pack 13 for Linux
6.1.0.19 WebSphere Application Server V6.1 Fix Pack 19 for AIX
6.1.0.19: WebSphere Application Server V6.1 Fix Pack 19 for HP-UX
6.1.0.19 WebSphere Application Server V6.1 Fix Pack 19 for i5/OS
6.1.0.19: WebSphere Application Server V6.1 Fix Pack 19 for Linux
6.1.0.19: WebSphere Application Server V6.1 Fix Pack 19 for Solaris
6.1.0.19: WebSphere Application Server V6.1 Fix Pack 19 for Windows
Java SDK 1.5 SR8 Cumulative Fix for WebSphere Application Server



APAR status
Closed as program error.

Error description
WebSphere Application Server for z/OS may incorrectly keep
track of HAManager socket activity when an asynchronous read
request completes on a different thread at the same time the
original thread is still handling the asynchronous return code.

This causes future reads to fail and ultimately the socket to
be closed.  As a side effect, the HAManager component is unable
to recover and will hang.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: All users of WebSphere Application Server    *
*                 V6.1 for z/OS                                *
****************************************************************
* PROBLEM DESCRIPTION: WebSphere Application Server for z/OS   *
*                      may close HAManager sockets causing     *
*                      the HAManager component to hang.        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The ZAioTCPChannel may lose track of internal state of
HAManager socket activity when an asynchronous read request
completes on a different thread at the same time the original
thread is still handling the asynchronous return code.

This causes future reads to fail and ultimately the socket to
be closed.  As a side effect, the HAManager component is unable
to recover and will hang.

A message similar to the following may be seen in the logs:
BBOO0221W: WSVR0605W: Thread "HAManager.thread.pool : 0"
(00000022) has been active for 762205 milliseconds and may be
hung.  There is/are 1 thread(s) in total in the server that may
be hung.  The HA Manager callback thread has been hung.
Problem conclusion
The ZAioTCPChannel has been updated to correctly synchronize
around concurrent thread access to the VC state tracking
mechanism used by the HAManager which will eliminate the hang
condition.

APAR PK55228 is currently targeted for inclusion in Service
Level (Fix Pack) 6.1.0.13 of WebSphere Application Server V6.1
for z/OS.
Temporary fix Comments
APAR information
APAR number PK55228
Reported component name WEBSPHERE FOR Z
Reported component ID 5655I3500
Reported release 610
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Special Attention NoSpecatt
Submitted date 2007-10-23
Closed date 2007-10-23
Last modified date 2007-11-20

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
ZAIOTCP          

Publications Referenced

Fix information
Fixed component name WEBSPHERE FOR Z
Fixed component ID 5655I3500

Applicable component levels
R500 PSN    UP
R601 PSN    UP


Document Information


Current web document: swg1PK55228.html
Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS
Operating system(s):
Software version: 610
Software edition:
Reference #: PK55228
IBM Group: Software Group
Modified date: Nov 20, 2007