PK49502: MSGDFHSM0002 CXSP A SEVERE ERROR (CODE X'030F') HAS OCCURRED IN MODULE DFHSMGF WHEN USING SOCKETCLOSE(0).

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MSGDFHSM0002 A severe error (code X'030F') has occurred in
  module DFHSMGF when using the SOCKETCLOSE(0) parameter.
  The trace entry shows the following failure:
   00003 SL    SM 030F SMGF  *EXC*
  Quickcell_freemain_QPF_already_free
   FREEMAIN,1627A3A4 , 000000B2,17259308,TASKASOC
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: MSGDFHSM0002 A severe error (code       *
  *                      X'030F') has occurred in DFHSMGF when   *
  *                      attempting to freemain TASKASOC         *
  *                      storage.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A timeout of a socket receive occurs immediately after a web
  alias task has sent an HTTP response. This is because
  SOCKETCLOSE was set to 0. The web alias task is
  in transaction termination when this happens. The sockets
  listener task ( CSOL ) processes the timeout and calls
  DFHWBSO which tries to close the socket.
  While closing the socket, the CSOL task running on the SL TCB
  unchains and freemains all TASKASOC blocks chained from the
  socket in a routine called remove_all.
  In parallel, the web alias task, running on the QR TCB
  unchains and freemains a single TASKASOC from the same socket
  object. This is done while holding the socket lock but a double
  freemain occurs because CSOL has failed to obtain the same lock
  in routine remove_all.
  
  ADDITIONAL KEYWORDS :- SM0002 DFHSM0002 030F 030D SOLTLOCK zero
  

Problem conclusion

• Socket routine remove_all has been changed to obtain the socket
  lock before unchaining and freemaining TASKASOC blocks from the
  socket object.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK40351

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

  UK28238

Modules/Macros

•    DESSOLT  DESSOSO  DFHSOLTC DFHSOSOC DFHSOS00
  DFHSOS01 DFHSOS02 DFHSOS03 DFHSOS04 DFHSOS05 DFHSOS06 DFHSOS07
  DFHSOS08 DFHSOS09 DFHSOS10 DFHSOS11 DFHSOS12 DFHSOS13 DFHSOS14
  DFHSOS15 DFHSOS16 DFHSOS17 DFHSOS18 DFHSOS19 DFHSOS20 DFHSOS21
  DFHSOS22 DFHSOS23
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UK28238

     UP07/08/18 P F708

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.