VM66352: PIPES MAY FAIL IN STARMSG DURING TERMINATION OF THE PIPELINE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CMS Pipelines applications using the STARMSG stage may ABEND
  during termination, commonly in routine FPLASYDM in module
  FPLASY
  
  When a pipeline using the STARMSG stage terminates through
  PIPESTOP or PIPMOD STOP with messages queued, CMS Pipelines may
  fail with messages similar to the ones shown below. Depending on
  timing and contents of the messages, the ABEND may also be
  caused by an addressing exception and may show in another
  routine.
  
  FPLINX410E ABEND 000000C4 at 02B7E2A6; PSW 03EC2000 82B7E2A6
             00040004.
  FPLINX411I ... In FPLASYDM; offset 00000216 in FPLASY 08/24/16
  FPLINX412I ... GPR0: 40F2F8F2 00000AE0 0FE14FD0 00000000.
  FPLINX412I ... GPR4: 00000000 0FDF96F8 0FDE0004 0FE147A0.
  FPLINX412I ... GPR8: 0FDFE100 0FDF96F8 02B1A302 0FDFD9C0.
  FPLINX412I ... GPRC: 82B7E26E 0FDFDEA0 82B7E28A FFFFFFAE.
  FPLINX413I ... Store 02B7E29C: 1FFF5800 10005060 10001861
                       12104780 C04446F0.
  FPLINX1198I Stage is active.
  FPLMSG003I ... Issued from stage 1 of pipeline 1.
  FPLMSG001I ... Running "starmsg".
  DMSABE141T Protection exception occurred at 82B7E2A6 in routine
             PIPE
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of CMS Pipelines using the STARMSG *
  *                 stage in combination with a PIPESTOP stage   *
  *                 or PIPMOD STOP to terminate STARMSG with a   *
  *                 large number of messages still queued in     *
  *                 STARMSG.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  CMS Pipelines logic released the buffer pools early when ending
  the IUCV connection for a terminating STARMSG or STARMON stage.
  After that, the stage tried to process the remaining queued
  messages. The pointers were leading to memory blocks that had
  already been released. Depending on the pipeline topology and
  timing, the released memory blocks could have been reused and
  modified, leading to various program checks.
  

Problem conclusion

• CMS Pipelines module FPLIUS has been corrected not to release
  the buffer pools when ending the IUCV connection, but leave that
  to the caller. The terminating STARMSG or STARMON stage can
  process any remaining messages, and will release the buffer
  pools when complete. This is the documented behavior of the
  STARMSG and STARMON stages.
  

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:

  UM35584 UM35585

Modules/Macros

• FPLIUS
  

Fix information

• Fixed component name

  VM CMS

• Fixed component ID

  568411201

Applicable component levels

• R640 PSY UM35584

     UP20/01/29 P 2001

• R710 PSY UM35585

     UP20/01/29 P 2101

Fix is available

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