PI13042: CSQX053E CSQSNAP XFFSXCSFREEOWNEDBUFFERS OWNERS DIDN'T FREE THEIR BUFFERS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CSQX053E xxxx CSQXFFST Error information recorded in CSQSNAP
  data set.
   The problem seen here occurs when a multiplexed channel is
  using a security exit and rriAcceptSecurityReceive needs to
  allocate a larger send buffer following the response from
  the security exit. The larger buffer is not associated with
  the primary conversation (ccxAllocMem is invoked with
  pSess -> hConv which is pointing to the conversation being
  started) and therefore the buffer does not get freed when
  the conversation ends. This leads to the subsequent FFSTs seen
  here.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 0 Modification 1 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Various CSQX053E CSQXFFST SNAP dumps    *
  *                      taken when using channel security exits *
  *                      on SVRCONN channels with SHARECNV > 1   *
  *                      if CSQXDBG DD card is defined.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When using security exits on SVRCONN channels defined with
  SHARECNV > 1, if the channel sends more data than can fit into
  the current transmission buffer then we reallocate a larger
  buffer. This realloction process does not correctly update the
  various cached pointers to this buffer and upon channel
  termination a CSQX053E message is displayed and an FFST SNAP
  dump is taken showing either:
  
    "xcsCheckPool Buffer Pool Memory error"
  or
    "xcsFreeOwnedBuffers"
  

Problem conclusion

• Buffer allocation when sending large amounts of data
  during security exit negotiation has been amended
  to ensure it does not incorrectly update cached buffer
  references.
  010Y
  100Y
  CSQXREXT
  

Temporary fix

Comments

• ×**** PE14/11/03 FIX IN ERROR. SEE APAR PI28088  FOR DESCRIPTION
  

APAR Information

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

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

  UI18505 UI18506 PI30045

Modules/Macros

• CSQXREXT
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UI18505

     UP14/06/27 P F406

• R100 PSY UI18506

     UP14/06/27 P F406

Fix is available

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