APAR status
Closed as duplicate of another APAR.
Error description
In certain situations on z/OS, when IPv6 is enabled, socket operations in Java will issue extraneous and invalid calls to the getsockopt and setsockopt system services. These calls will fail, but will not cause any problems with sockets or data communication. A trace of USS calls (either via CTRACE or GTF trace with SLIPs) may show these repeated failures under the covers.
Local fix
To eliminate the calls to get/setsockopt, you will need to deactivate IPv6 support in the Java Virtual Machine. This can be accomplished with the Java System Property: java.net.preferIPv4Stack = true At the commandline this can be set with a -D commandline option. Alternately the IBM_JAVA_OPTIONS environment variable can be used to set this at a higher scope for all running JVM processes with access to the variable. IBM_JAVA_OPTIONS = -Djava.net.preferIPv4Stack=true NOTE: The extraneous and erroneous system calls do not cause any failures of application or JVM functionality. The only potentially visible symptom is a performance impact while performing socket operations. The Local Fix / Circumvention above should be used only in cases where the syscall error performance issue is causing an impact on the system. And only when IPv6 communication is not required.
Problem summary
Problem conclusion
Temporary fix
Comments
PM13601 is a sysroute of APAR PM01840. It was taken to deliver a ++APAR. PM13601 is being closed DUP of PM18025 because PM18025 will document the delivery of SDK 1.5 SR12 which will contain the fix for PM01840.
APAR Information
APAR number
PM13601
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
610
Status
CLOSED DUB
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-05-03
Closed date
2010-07-08
Last modified date
2010-08-19
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Applicable component levels
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
10 February 2022