PI82345: WMQ V900 WHEN XA CLIENTS USING SVRCONN CHANNEL WITH CSQSERVICE1 ATTEMPT MQGET AGAINST SHARED QUEUE, A STORAGE LEAK OCCURS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When XA clients are using a SVRCONN channel with the
  CSQSERVICE1 keyword and the client attempts MQGET against a
  shared queue with commited or uncommitted messages, a storage
  leak can be seen.   ETRQS storage leak.
  .
  Additional Symptom(s) Search Keyword(s):
  WMQ V900 LTS Long Term Service
  SubPool 229 Key 7 SP229 KEY7  ETRQ  CFM Thread Stg
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Messages CSQY221I and CSQY222E may be   *
  *                      seen when performing XA work against    *
  *                      shared queues, with CSQSERVICE1 being   *
  *                      set on the SVRCONN channel the XA       *
  *                      client is using or when TMF clients     *
  *                      used.                                   *
  ****************************************************************
  When CSQSERVICE1 is set for a SVRCONN or when TMF clients are
  used , and XA work is being performed across the channel to a
  shared queue, eTRQS control blocks may be leaked. These control
  blocks should be cleaned up after a commit or backout. However
  if an MQGET does not result in a message being retrieved, the
  control block may be leaked. If this scenario is repeated,
  message CSQY221I and CSQY222E may be output. Additionally with
  these clients, if an XA_PREPARE returns a read only or backed
  out return code, the ACE associated with the UOW may also be
  left, resulting in subpool 231 ECSA storage being leaked, and
  the CSQY221I and CSQY222E messages.
  

Problem conclusion

• Processing during these scenarios has been updated for clients
  using CSQSERVICE1 or TMF clients to prevent the eTRQS and ACE
  being leaked in these cases.
  

Temporary fix

Comments

APAR Information

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

  PI73877

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

  UI48254 PI95726

Modules/Macros

• CSQEDALL CSQMCPRH CSQMXARH
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI48254

     UP17/08/10 P F708

Fix is available

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