A fix is available
APAR status
Closed as program error.
Error description
Code introduced through PI52987/UI33363 can impact applications using an RRS enabled connection to WebSphere MQ ( including bindings mode connections from WAS ) When a connection to MQ is in an MQGET wait and either a message arrives or the wait interval expires, the code to post the waiting task can incorrectly determine that the task is no longer valid and skip the post call. This results in the connection remaining permanently suspended in the MQGET wait. . Additional keywords: WebSphere Application Server WAS WSAS IBM Integration Bus (formerly WebSphere Message Broker)
Local fix
n/a
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0 * **************************************************************** * PROBLEM DESCRIPTION: After applying UI33363, RRS * * applications (including IIB and WAS) * * issuing MQGET calls can hang * * indefinitely if the MQGET is issued on * * a different TCB to that originally used * * by a context, and the original TCB is * * no longer active. * **************************************************************** * RECOMMENDATION: * **************************************************************** When a getting application is being posted (for example, by the arrival of a suitable message, or the expiry of the get wait interval), code added to CSQM1P1W by PI52987 checks if the getter TCB is still active if there are any tasks in the getter address space in EOT processing. This check uses the tcbtoken stored in the getter's MTHR, however if the MQGET call was issued on a different TCB to the TCB the context originally used, the tcbtoken is incorrect and still relates to the original TCB. If that TCB has ended, CSQM1P1W incorrectly determines that the getter is going through EOT processing and skips posting the getter's ECB, leading to the reported problems.
Problem conclusion
CSQMGET is changed to ensure the MTHR associated with an RRS MQGET request is updated with the correct tcbtoken for the TCB currently being used for the MQGET request, allowing the check in CSQM1P1W to correctly determine if that TCB is still active or not. 000Y CSQMALL CSQMCETH CSQMGET CSQM1P1W
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI61141
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
YesPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-04-20
Closed date
2016-05-12
Last modified date
2016-07-29
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI61683 UI37798
Modules/Macros
CSQMALL CSQMCETH CSQMGET CSQM1P1W
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI37798
UP16/05/26 P F605 «
Fix is available
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Document Information
Modified date:
29 July 2016