PM79081: JVMSERVER RESOURCES HANGS WAITING ON JVMTHRED WHICH RESULTED FROM A FAILED PTHREAD CREATE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You have a task that is hung with a resourse type of JVMTHRED.
  When you look in in CICS Internal Trace you see  exceptions for
  PTHREAD_CREATE_FAILED and PTHREAD-INSUFFICIENT-STORAGE. The
  reason for the failing PTHREAD is because there is not enough
  below the line to create a new pthread. This leads to failures
  to create the system thread needed to gather the statistics
  from within the JVMSERVER.
  
  Once the create of the system thread fails all other processing
  in DFHSJTH gets bypassed. This means that the thread is not
  deallocated properly. So, when the next request comes in to the
  JVMSERVER it thinks that the system thread is in use and waits
  for the current user to complete and free the thread. The
  thread is not really in use so the task hangs.
  
  Additional Symptom(s) Search Keyword(s): KIXREVRHC
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: JVMSERVER resource hangs waiting on     *
  *                      JVMTHRED which resulted from a failed   *
  *                      PTHREAD creation.                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A request is made into a running JVMSERVER to obtain the
  statistics. This request requires a system thread to be created
  by DFHSJTH. It obtains use of the system thread by setting the
  owner field in the system thread slot associated with the
  JVMSERVER.
  As there is not enough below the line MVS storage available,
  PTHREAD creation fails. This leads to failures to create the
  system thread. Once the creation of the system thread fails,
  all other processing in DFHSJTH gets bypassed and the thread is
  not deallocated properly.
  When the next request comes in to the JVMSERVER, the task finds
  the system thread already has an owner, then the task suspends
  to wait for the thread to be deallocated. The thread is not
  really in use so the task hangs forever.
  

Problem conclusion

• DFHSJTH has been changed to clear up the failed system thread
  when PTHREAD creation failed due to insufficient storage below
  the line.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM73855

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

  UK92312

Modules/Macros

• DFHSJDM  DFHSJDUF DFHSJJS  DFHSJST  DFHSJTH
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R800 PSY UK92312

     UP13/03/15 P F303

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.