Resolution:
Description:
============
An unexpected delay in processing a remote CLI client request in a z/OS Execution Environment may lead to various failures including:

1) abend U2168

2) message: S6BST001E STORAGE MANAGER ERROR INVALID DESCRIPTOR FOR A RELEASE REQUEST


Environment:
==========
* Remote CLI SDK client accessing an Execution Environment (EE) on z/OS


Symptoms:
=========
S6BST001E STORAGE MANAGER ERROR: INVALID DESCRIPTOR FOR A RELEASE REQUEST    
S6BDR002E ERROR=U2168 S6BDRTMR.STGMTHD +00D6A VERSION=12/23/08 08.42 V5R0M1153
S6BDR068E ERROR RECOVERY FAILED FOR TASK CLASS HSIN020                        


Cause:
=====
A timing window in the z/OS Execution Environment allowed two units of work to be dispatched concurrently for the same session after a delay was encountered. Due to perhaps higher priority work in z/OS, after a response had been scheduled back to the remote CLI SDK client the work was pre-empted by z/OS. The client response was then received and dispatched before the original pre-empted work had completed. Both units of work ran the risk of executing in parallel and interfering with each other's status information.

Resolution:
=========
The problem is being resolved by closing the timing window by allowing only one piece of work for a specific client session to be dispatched at any given time.

Customers experiencing this problem should open a service request with TIBCO Support and ask to monitor the resolution for defect OSBZ-1217.


References:
==========
TIBCO® Object Service Broker for Open Systems External Environments 5.0.0
TIBCO® Object Service Broker for z/OS External Environments 5.0.0

Remote CLI SDK client may cause a U2168 abend or error message: S6BST001E STORAGE MANAGER ERROR INVALID DESCRIPTOR FOR A RELEASE REQUEST when a response to the client is pre-empted by z/OS.