PH43756: Loop during thread termination starting with IGZETHT and involving repeated invocation of IGZXWAIT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During COBOL runtime thread termination in a multithreaded
  environment, IGZXWAIT is repeatedly driven waiting on a state
  that doesn't come to pass.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL 5 and later        *
  *                 releases running programs which have         *
  *                 QSAM or VSAM I/O in a multithreaded          *
  *                 environment.                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: In a multithreaded environment where    *
  *                      COBOL programs have QSAM or VSAM I/O,   *
  *                      the application hangs during thread     *
  *                      termination (IGZCEV24). The hang starts *
  *                      with IGZETHT and continues with         *
  *                      repeated invocation of IGZXWAIT.        *
  ****************************************************************
  * RECOMMENDATION: Install the provided PTF.                    *
  ****************************************************************
  During the thread termination (IGZCEV24), COBOL Runtime
  repeatedly attempts to obtain a mutex lock which was
  previously destroyed, and it leads to a hang.
  
  COB0501T/K COB0502T/K COB0601T/K COB0602T/K COB0603T/K
  

Problem conclusion

• The error in the COBOL Runtime has been corrected.
  Logic has been added to the runtime to detect validity of
  a mutex before attempting to obtain a lock to fix the hang.
  Also if there are other Runtime errors due to an invalid mutex,
  it will lead to an ABEND caused by an incorrect address of
  0xC4C9C5F1 (hex value of a 'DIE1' EBCDIC string). If the ABEND
  occurs, contact IBM for assistance.
  

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:

  UI79452 UI79453 UI79454

Modules/Macros

• IGZCEV4  IGZCMGEN IGZCMGUE IGZLLIBV IGZXAPI  IGZXCA31 IGZXCDA
  IGZXD24  IGZXDMR  IGZXJNI2 IGZXLPIO IGZXLPKA IGZXLPKB IGZXLPKC
  IGZXLPKD IGZXLPKE IGZXLPKF IGZXLPKG IGZXPK2
  

Fix information

• Fixed component name

  LE ENT COBOL LI

• Fixed component ID

  568819812

Applicable component levels

• R7B0 PSY UI79452

     UP22/03/01 P F202

• R7C0 PSY UI79453

     UP22/03/01 P F202

• R7D0 PSY UI79454

     UP22/03/01 P F202

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.