PI37202: S0C4 ABEND MAY OCCUR IN MODULE IGZXSIG DURING THREAD TERMINATION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The problem affects the users  running COBOL programs in
  multiple threads. It may occur during POSIX thread termination,
  if an asynchronous signal is raised while thread level storage
  is being cleaned up, the module IGZXSIG would attempt to handle
  the signal by referencing the COBOL thread control block that
  has already been freed, resulting in an S0C4 ABEND.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Enterprise COBOL V5 users running COBOL      *
  *                 programs in multiple threads.                *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: An S0C4 ABEND may occur in module       *
  *                      IGZXSIG during thread termination.      *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During POSIX thread termination, if an asynchronous signal is
  raised while thread level storage is being cleaned up, the
  module IGZXSIG would attempt to handle the signal by referencing
  the COBOL thread control block that has already been freed,
  resulting in an S0C4 ABEND.
  

Problem conclusion

• Before freeing the thread control block storage, zero out the
  pointer to that storage first so that IGZXSIG will not attempt
  to handle any asynchronous signal, but letting LE take the
  default action.
  

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:

Modules/Macros

• IGZXLPKA
  

Fix information

• Fixed component name

  LE ENT COBOL LI

• Fixed component ID

  568819812

Applicable component levels

• R780 PSY UI26064

     UP15/04/02 P F504

• R790 PSY UI26065

     UP15/04/02 P F504

Fix is available

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