PI88441: WMQ ABEND IN METAL C LOAD MODULE CCR3FCNS ( CSECT CCR3MMOV ) AFTER BEING INVOKED BY CSQXXTRC IF ACTIVITY RECORDING IS ACTIVE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When MQ activity recording is enabled, a message exit is used on
  a channel, and that channel receives a trace route message, this
  may result in an ABEND in Metal C code. In this case MQ
  incorrectly fails to turn on trace route processing which
  results in messages being incorrectly processed. This can result
  in a loop adding trace route data to a valid message, followed
  by a subsequent abend.
  .
  Additional keywords:
  ABEND0C4 ABENDS0C4 0C4 00C4 S0C4 S00C4 00000004 00000011
  

Local fix

• Turn off activity recording via ALTER QMGR ACTIVEREC(DISABLED)
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 8       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: When a queue manager with activity      *
  *                      reporting enabled receives a trace      *
  *                      route message that fails a message      *
  *                      exit, trace route processing does not   *
  *                      get turned off and therefore subsequent *
  *                      messages are incorrectly getting trace  *
  *                      route data appended. This may cause a   *
  *                      storage overlay which can cause         *
  *                      unpredictable behaviour and can result  *
  *                      in an abend.                            *
  ****************************************************************
  When a queue manager has both activity reporting enabled and a
  message exit defined on a receiver channel receives a trace
  route message that fails in the message exit, trace route
  reporting does not get turned off. As a side effect of this the
  final activity report is not sent. Therefore when subsequent
  messages flow over the channel they are incorrectly appended
  with trace route data which may cause a storage overlay which
  can cause unpredictable behaviour and can result in an abend.
  

Problem conclusion

• When a message fails on a message exit for a receiver channel
  there is now a check if trace route processing is turned on. If
  trace route processing is on then it will be turned off to
  ensure future messages are not treated as trace route messages.
  If there is an outstanding activity report then it will be sent
  prior to the reset.
  

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:

  PH18843 UI67847

Modules/Macros

• CSQXRMTR
  

Fix information

• Fixed component name

  IBM MQ Z/OS V8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI67847

     UP20/03/11 P F003 ¢

Fix is available

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