PH11610: IBM MQ: PERFORM AN LPISPINOTIFY WITH LPISPINOTIFY_BREAKCONN INCORRECTLY.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• lpiSPINotify_BREAKCONN was set even if they use SHARECNV(0)
  client channel.
  There is a logic error that is causing us to incorrectly enter
  the wrong section of code and perform an lpiSPINotify with
  lpiSPINotify_BREAKCONN even when we should not be doing so. This
  means that the ACESTOP flag is also incorrectly set on.
  The incorrect logic performs a bitwise OR check with "|" rather
  than a boolean OR check with "||" and drives the lpiSPINotify
  call when it should not.
  .
  Additional symptoms and keywords:
  2321  0x00000911  MQRC_PARAMETER_MISSING
  MQ clients using FAP (protocol) level 9 or earlier - MQ V700 or
  earlier clients - will always fail to connect
  Also: looking in the CHINIT logs; many
  CSQX511I (channel started), and CSQX512I
  (channel no longer active) messages could be seen.
  - High CPU in CHIN
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0 and Version 9       *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Older versions of the client connecting *
  *                      to a V910 queue manager may receive an  *
  *                      MQRC 2321 (MQRC_PARAMETER_MISSING).     *
  *                      Older versions of the client connected  *
  *                      to a V900 queue manager may find their  *
  *                      connection terminated when a different  *
  *                      client is connected.                    *
  ****************************************************************
  When trying to connect an older version of the client to a v910
  queue manager the client may receive a return code of 2321
  (MQRC_PARAMETER_MISSING) which results in the client failing to
  connect. When there are older versions of the client connected
  to a v900 queue manager, the connection may get incorrectly
  terminated when a different client connects.
  

Problem conclusion

• Older versions of the client will now be able to connect into
  v910 queue managers. Older versions of the client connected to a
  v900 queue manager will not have their connection terminated
  when a different client connects.
  

Temporary fix

Comments

APAR Information

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

  PH06966

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

  UI63879 UI63880

Modules/Macros

• CSQXRCSV
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI63879

     UP19/07/23 P F907 ¢

• R100 PSY UI63880

     UP19/07/23 P F907 ¢

Fix is available

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