PH63406: IHS MAY CONTINUALLY CREATE THREADS IN CHILD PROCESSES, FAR OVER THREADSPERCHILD

APAR status

• Closed as program error.

Error description

• Not reported directly by IHS, but an unusually high number of
  threads may be visible with `ps` or mod_mpmstats
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM HTTP Server on Linux       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Under some unknown conditions, IHS      *
  *                      creates far more than the configured    *
  *                      number of threads per process.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Under some unknown (and rare) conditions, IHS creates far more
  than the configured number of threads per process.
  It was later determined that the user had mixed binaries from
  different fix packs, specifically modules/mod_mpm_event.so and
  bin/httpd were from different fix packs which is unsupported
  In this case, instead of catastrophic failures, IHS never
  stopped creating worker threads at startup due to mismatched
  data structures.
  

Problem conclusion

• Prior to determining the info in the problem summary, the code
  was updated with additional safeguards and logging to help
  identify and avoid the problem.
  
  The fix for this APAR is targeted for inclusion in IBM HTTP
  Server fix packs 9.0.5.22. For more information, see 'Recommende
  Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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:

Fix information

• Fixed component name

  IBM HTTP SERVER

• Fixed component ID

  5724J0801

Applicable component levels