PI57113: MQ CSQX053E INTERMITTENTLY RECEIVING MESSAGE CSQX053E IN CHINIT CSQSNAP INFORMATION XSTB STORAGE PROBLEM X 16/04/13 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Message CSQX053E is intermittently issued to the CHIN joblog.
  CSQX053E CSQXFFST Error information recorded in CSQSNAP data set
  .
  CSQSNAP output:
  *                        X...XFFS*
  *xcsFreeMem......................*
  *MOVR......p../..X...XINS./......*
  .
  *....XSTB Storage Problem........*
  *X...XSTB........                *
  .
  
  .
  In this instance it involves a cluster-receiver channel using a
  CHAD exit.
  .
  Keywords: xcsFreeMem xcsFreeMem XFFS XSTB Storage Problem
  rriFreeSess ClusterPtr storage MQCD conname
  .
  This problem may result in various other symptoms, such as
  an FFST issued by rrmRunTimers due to an rrmTimer control
  block being overlaid, resulting in high CPU on the CHIN's
  repository task.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message CSQX053E message issued warning *
  *                      that an FFST has been written to        *
  *                      CSQXSNAP. FFST contains information     *
  *                      referring to rriFreeSess and            *
  *                      "XSTB Storage Problem".                 *
  *                      Also high CHINIT CPU may be seen and an *
  *                      FFST produced by rrmRunTimers.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A cluster sender channel is started on a queue manager which has
  a CHAD exit defined, and the conname on the channel has more
  than one address (separated by a comma or commas). If the first
  destination in the conname fails then rriFreeSess frees up the
  storage pointed to by ClusterPtr but pChannel->CD.ClusterPtr
  still points to it. The channel may subsequently start when it
  retries with one of the remaining addresses in the conname, but
  when rriClusterFields is called it sees that the ClusterPtr
  address is not null and therefore quits.
  When the channel terminates rriFreeSess tries to release the
  ClusterPtr storage again, but it has already been freed, hence
  the FFST.
  

Problem conclusion

• rriCallerEntry has been changed so that the channel ClusterPtr
  is nulled out if an attempt to start a CLUSSDR channel has
  failed.
  100Y
  CMQXREVN
  CMQXRMSA
  CSQXCCAX
  CSQXCCCX
  CSQXRCCC
  CSQXREXT
  CSQXRFXC
  CSQXRMAS
  CSQXRMRS
  CSQXRMSS
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  PI60547 IV83640 UI37031

Modules/Macros

• CMQXREVN CMQXRMSA CSQXCCAX CSQXCCCX CSQXRCCC CSQXREXT CSQXRFXC
  CSQXRMAS CSQXRMRS CSQXRMSS
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI37031

     UP16/05/04 P F605 ­

Fix is available

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