PM80395: CICS SOS DFHSM0133 IN ESDSA, STORAGE CREEP IN IE_BUFF SUBPOOL.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS TS 4.1
  DFHSM0133 CICS is under stress (short on storage above 16MB)
  Analysis of the dump taken when DFHSM0133 was issued shows
  the EUDSA and ESDSA are both marked SOS.
  ESDSA has a large IE_BUFF subpool (id 84) size 125M.
  The IE domain shows approx 1700 active conversations represented
  bu IECSB control blocks with chained IE_BUFF and IECCB blocks.
  The size of the IE_BUFF subpool contributes to the SOS in CICS.
  .
  Looking at the Joblog for this region which has been running
  for several months shows that there were around 1700 instances
  of a connection timeout with CICS TG and messages:
  DFHIE0998 Mirror transaction processing ECI request from TCP/IP
  connected client has abended with AITH
  DFHIE1105 Error attempting socket send to ECI client.
  .
  After one of these abendAITH, the IECSB and its
  IE_BUFF and IECCB are not being freemained causing the
  IE_BUFF subpool in the CICS ESDSA to grow larger and larger.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: A storage leak occurs when CICS         *
  *                      Transaction Gateway abnormally          *
  *                      close an ECI over TCPIP connection      *
  *                      and mirror tasks are active for the     *
  *                      connection.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A collection of CICS Transaction Gateway connected mirror
  tasks are active in CICS. The CICS Transaction Gateway
  connection is abnormally terminated. This causes a CIEP task
  to be attached.This task detects that an error has occurred
  which drives client_error processing in DFHIEIE. CIEP loops
  through the IECCBs for the connected mirror tasks, attempting
  to send an FMH7 to the remote client on behalf of the mirror
  tasks.It getmains a temporary buffer to hold the FMH7 message.
  One of the SENDs fails due to the state of the socket
  connections DFHIEIE's socket SEND logic raises an error and
  exits DFHIEIE. This causes FMH7 processing to be abandoned and
  the 33k temporary buffer used for FMH7 processing is never
  freemained.
  

Problem conclusion

• DFHIEIE has been changed so that if a socket SEND error occurs
  in client_error processing,cleanup will continue which ensures
  that the temporary 33K FMH7 buffer is freed.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM58976

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

  UK91463

Modules/Macros

•    DFHIEIE
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UK91463

     UP13/02/15 P F302

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.