PH08141: ABEND0C4 CSQ5AROB AFTER CSQ5CONN TO PROCESS SQL SELECT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Change Team finds application is performing some work on a
  shared queue that results in a call to CSQ5READ in order to
  obtain information from DB2.
  CSQ5READ has set up its parameters and parameter lists to
  call CSQ5AROB and performed an execution unit switch onto
  a DB2 task.
  While waiting for the call to complete, the original task
  is terminated by DB2 with an S004E-00E50013 abend (along
  with many other tasks performing DB2 operations).
  While the service task is attempting to process the DB2
  request from CSQ5READ, the original task goes through
  termination processing and cleans up/reuses its auto
  stack storage.
  The DB2 service task then attempts to read the parameter
  list from the original caller, but due to the termination,
  the storage no longer contains the correct values, and as
  a result we abend.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: 0C4 abend in CSQ5AROB after DB2         *
  *                      failure that causes the calling task to *
  *                      be abnormally terminated.               *
  ****************************************************************
  CSQ5READ, after performing an EU switch to CSQ5AROB, waits on
  the new EU to complete. DB2 in the meantime has terminated all
  tasks in all address spaces. Hence the caller of CSQ5AROB is
  terminated and the automatic stack storage used to pass in the
  parameters is reused and the parm list is overwritten. CSQ5AROB
  then tries to access the parm list and finds an incorrect
  storage location, resulting in an 0C4. In this case the storage
  has been initialised to zeros and the STCKF instruction fails
  with an abend 0C4-04.
  

Problem conclusion

• Code has been changed so that the CSQ5AROB parm list persists
  after CSQ5READ terminates.
  

Temporary fix

Comments

APAR Information

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

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

  UI68824 UI68825

Modules/Macros

• CSQ5READ
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI68824

     UP20/05/28 P F005

• R100 PSY UI68825

     UP20/05/28 P F005

Fix is available

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