PI64991: MQ ON ZOS: ALL CHINIT IN THE QUEUE SHARING GROUP MAY HANG WHEN A SHARED CHANNEL IS DELETED.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After deleting a shared channel receiver, the CHINIT no longer
  responds and CPU usage may be high.
  This problem may occur when there is a duplicate key in MQ table
  of DB2 data-sharing group.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Increased CPU may be seen in the        *
  *                      Channel initiator when deleting a       *
  *                      shared channel.                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When deleting a shared channel, the status is read from the
  shared sync queue using a unique key for the channel stored in
  DB2 table CSQ.ADMIN_B_SSKT. However, if multiple shared channels
  have the same sync queue key due to some prior error, the delete
  processing may enter a loop, with high cpu seen in the CHINIT
  address space, and the channel will not be deleted. The CHINIT
  may become unresponsive, and require it to be canceled.
  

Problem conclusion

• Delete processing has been altered to not enter a loop in this
  case, and allow the CHINIT to remain responsive.
  000Y
  CSQXRCMN
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  PI72557 UI43146

Modules/Macros

• CSQXRCMN
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI43146

     UP17/01/27 P F701

Fix is available

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