PH44463: ABN 5C6 00E70022 ,C=MQ900.910.CHIN OC=CSQXRCTL.FFST(60010D03)

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• FFST is issued from xcsFreeOwnedBuffers due to a conversation
  on a SVRCONN ending without freeing its message buffer. This
  issue only occurs for SHARECNV > 0 channels and will be
  accompanied by
  message CSQX208E or CSQX209E. If the async consumer thread is
  in an lpiSPIMQGETM which gets a new message buffer, and the
  receive thread notices an error during this call, then the
  problem will occur. QMGR routines CSQMALCH and CSQMXALC are
  called to allocate the new buffer in the CHINIT address space.
  The new message buffer address is saved in the lpiGETOPT, but
  if the receive thread notices an error and sets flag
  ccxOPT_ASYNC_ERROR, then the buffer will be leaked on return
  from the lpiSPIMQGETM call.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0, Release 2          *
  *                 Modification 0 and Release 3 Modification 0. *
  ****************************************************************
  * PROBLEM DESCRIPTION: While attempting to get a message       *
  *                      larger than 4k bytes over a             *
  *                      multiplexed connection, a network       *
  *                      error occurs. This will cause a         *
  *                      5C6-00E70022 abend in the queue         *
  *                      manager, an FFST issued from            *
  *                      xcsFreeOwnedBuffers and the CSQX208E    *
  *                      or CSQX209E messages to be produced.    *
  ****************************************************************
  If a network error occurs while a get message is in progress
  over a multiplexed client connection, the client conversation
  ends without freeing all of the buffers associated with the
  connection. This causes an abend when the conversation with
  the client ends.
  

Problem conclusion

• A check has been added in the exit routine of the code to free
  the buffer that was being overlooked in this scenario. As a
  result, an abend will no longer occur when the client
  conversation ends.
  

Temporary fix

Comments

• ×**** PE22/11/16 FIX IN ERROR. SEE APAR PH50960  FOR DESCRIPTION
  

APAR Information

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

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

  UI82255 UI82256 UI82258

Modules/Macros

• CSQXRSTM
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI82255

     UP22/09/17 P F209

• R200 PSY UI82256

     UP22/09/17 P F209

• R300 PSY UI82258

     UP22/09/17 P F209

Fix is available

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