PH52928: MQ Z/OS: TLS V1.3 CHANNEL MET CCXALLOCMEM FAILURE WITH CSQX027E WITH RC=00008120

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• User met CSQX027E with  RC=00008120,which followed CSQX053E
  MU1T CSQXFFST Error as below when a channel
  was changed to TLV 1.3 TLS_AES_128_GCM_SHA256. When a buffer
  resize is requested in ccxAllocMem , buffer manager fails the
  request as Max Tran Size was less than requested.
  FFST:
  
  *                        X...XFFS*
  *ccxAllocMem.....................*
  *MOVR......p.....X...XINS..a.....*
  *................................*
  
  *........Length..................*
  
  CHIN joblog:
  +CSQX638E CSQ1 CSQXRCTL SSL communications error for channel
  XXXXXXXX, connection CONN1 (X.X.X.X)
  
  +CSQX599E CSQ1 CSQXRCTL Channel XXXXXXXX ended abnormally
  +CSQX053E CSQ1 CSQXFFST Error information recorded in CSQSNAP
  data set
  
  +CSQX027E CSQ1 CSQXRESP Unable to get
  storage, RC=00008120
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0 and Release 3       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: When starting a channel with TLS        *
  *                      enabled, it is possible for CSQX027E    *
  *                      "Unable to get storage" and CSQX053E    *
  *                      "Error information recorded in CSQSNAP  *
  *                      data set" errors to be issued. The FFST *
  *                      in CSQSNAP shows the error was issued   *
  *                      from routine ccxAllocMem.               *
  ****************************************************************
  The code which handles resizing a buffer during a TLS handshake
  is incorrectly allocating the size of the buffer.
  

Problem conclusion

• The code has been changed to allocate the size of the buffer
  correctly.
  

Temporary fix

Comments

• ×**** PE23/11/21 FIX IN ERROR. SEE APAR PH58320  FOR DESCRIPTION
  

APAR Information

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

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

  UI92291 UI92292

Modules/Macros

• CSQXCCIT
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI92292

     UP23/07/15 P F307

• R300 PSY UI92291

     UP23/07/15 P F307

Fix is available

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