PH43522: ABEND0C4 IN MODULE DFHSOSE DURING SECURE_SOC_CLOSE DUE TO FREED SSL_DATA_PTR

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MESSAGE:   DFHSO0001 An abend (code 0C4/AKEX) has occurred at
  offset X'2226' in module DFHSOSE.
  .
  From trace:
  SO 0803 SOSE  *EXC* - RECOVERY_ENTERED
  FUNCTION(SECURE_SOC_CLOSE) RESPONSE(DISASTER) REASON()
  .
  Abend0C4 is taken on an NI instruction at offset x'2222' in
  DFHSOSE after Reg1 is loaded with bytes of x'00'. The region is
  quiescing as the transaction attempts to close the socket and
  the transaction takes an AWB2 abend after the abend0C4 since it
  is not shutdown-enabled. Fix for APAR PH30840 is applied to the
  system, so the block addressed by ssl_data_ptr must be getting
  freed just after the change_mode completes. When the block is
  freed, the address is set to 0 and that is what causes the
  abend0C4.
  Additional Symptom(s) Search Keyword(s): KIXREVPAD
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 0C4 in DFHSOSE when two tasks     *
  *                      attempt to close the same socket.       *
  ****************************************************************
  CICS has a TCPIPSERVICE with PROTOCOL(HTTP) and SSL(YES). A new
  request arrives and a web alias task is attached to process
  it. At the end of the task it decides to close the socket.
  At the same time, CICS is shutdown or CEMT SET TCPIP CLOSED is
  is issued and the socket listener task (CSOL) is called to
  quiesce.
  
  CSOL then begins to close all of the sockets associated with the
  TCPIPSERVICE, including the socket currently being closed by the
  web alias task.
  
  An abend 0C4 can then occur in module DFHSOSE when the closed
  and deleted socket is referenced by the other task.
  

Problem conclusion

• CICS has been updated to make sure that only a single task can
  close a HTTP socket.
  
  This also addresses the problem reported in PH30840 at
  CICS TS 5.5 and CICS TS 5.6.
  

Temporary fix

Comments

APAR Information

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

  PH38300

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

  UI80124 UI80125

Modules/Macros

• DFHSOAD  DFHSOCK  DFHSODM  DFHSODUF DFHSOIS  DFHSOL   DFHSOLI
  DFHSOLS  DFHSOLX  DFHSOLX6 DFHSOM01 DFHSOM02 DFHSOM03 DFHSOPL
  DFHSORD  DFHSOS00 DFHSOS01 DFHSOS02 DFHSOS03 DFHSOS04 DFHSOS05
  DFHSOS06 DFHSOS07 DFHSOS08 DFHSOS09 DFHSOS10 DFHSOS11 DFHSOS12
  DFHSOS13 DFHSOS14 DFHSOS15 DFHSOS16 DFHSOS17 DFHSOS18 DFHSOS19
  DFHSOS20 DFHSOS21 DFHSOS22 DFHSOS23 DFHSOSE  DFHSOST  DFHSOTB
  DFHSOTI  DFHSOTRI DFHSOUE  DFHSOXM
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI80125

     UP22/04/15 P F204

• R200 PSY UI80124

     UP22/04/14 P F204

Fix is available

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