PH61243: CSQX111E USER CHANNEL EXIT ABENDS U4000-00007202; CSQX112E S0C8 FOR CHANNEL/S IN TCB

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• S0C8 abend is occurring in MQ routine rriCheckInitiators. R1 is
  loaded with a retry time value which is 0x7FFFFFFF, this is
  then incremented with an AHI instruction which overflows. This
  results in condition code 3 being set and a fixed-point
  overflow exception occurring because the fixed-point-overflow
  mask bit in the PSW is on.
  
  MQ calling an LE user exit with the PSW fixed-point-overflow
  mask bit OFF, and the exit abends U4000-00007202. An MQ ESTAE
  routine then gets control with the PSW fixed-point-overflow
  mask bit now ON, and it is also still ON when the MQ ESTAE
  retries the abend.
  .
  Additional keywords and symptoms:
  ABENDU4000
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 3 Modification 0, and                *
  *                 Release 4 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: User exit abends can result in MQ       *
  *                      recovery routines being percolated to   *
  *                      with fixed-point-overflow mask bit ON.  *
  *                                                              *
  *                      This can result in unexpected 0C8       *
  *                      abends                                  *
  ****************************************************************
  MQ calls an user exit with the PSW fixed-point-overflow
  mask bit OFF, the exit abends and the MQ ESTAE routine then
  gets control but potentially with PSW fixed-point-overflow mask
  bit now set to ON. This state is then passed onto retry
  routines.
  

Problem conclusion

• The recovery retry routine and ESTAE have been updated to
  ensure that program mask bits are switched off before carrying
  out operations so that 0C8 abends do not occur.
  

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:

  UI98912 UI98913

Modules/Macros

• CSQXDISP CSQXRRCR CSQXRRCX
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R300 PSY UI98913

     UP24/11/16 P F411

• R400 PSY UI98912

     UP24/11/16 P F411

Fix is available

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