PI63409: WMQ ABEND0C4 DURING CHINIT SHUTDOWN IN CSQXRERR +004CA

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During CHINIT shutdown that task issues MQRC 2202 (ie.
  MQRC_CONNECTION_QUIESCING) The CHINIT generates dump title
  ABN=0C4-00000011,C=R3600.710.CHIN,M=CSQXDISP,LOC=CSQXRCTL.
  CSQXRERR+004CA indicating the pointer to pErrorInfo references
  unavailable storage. Change Team finds this abend occurs when
  issuing a message for a held conversation (an incoming
  connection has been blocked by the listener due to a BLOCKADDR
  CHLAUTH rule and the connection is held for 30 seconds before
  the error is reported and the connection terminated).
  During that time period the CHINIT begins shutdown, causing the
  listener to end and its errorInfo control block to be freed.
  However, the held conversation still refers to this errorInfo
  control block and the abend occurs when attempting to use it to
  issue the error message while that storage is no longer
  available.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend S0C4 may occur in CSQXRERR during *
  *                      shutdown of the channel initiator if a  *
  *                      blocked channel is attempting to        *
  *                      connect.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If a channel that matches a CHLAUTH BLOCKADDR rule is attempting
  to connect at the same time as the channel initiator is shutting
  down, an S0C4 abend may occur in CSQXRERR as some storage that
  is being used by the blocked channel may be released when the
  listener task terminates.
  

Problem conclusion

• Processing has been amended to ensure that the storage used by
  the blocked channel remains available, even if the listener or
  channel initiator is terminated during the connection process.
  100Y
  CSQXRMRS
  

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:

  UI38923

Modules/Macros

• CSQXRMRS
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI38923

     UP16/07/28 P F607

Fix is available

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