PH08463: REGION HANG HUNG WITH TASKS IN LMQUEUE WAITS FOR THE LE_LOCK MAY ALSO SEE DFHAP0002 CODE 1954

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are running CICS Transaction server 5.2 and
  start seeing more of the following message:
  DFHAP1301 Language Environment has detected a
            corruption of its control blocks. Transaction tran
            currently executing.
  
  Then sometimes following this, may also see the following
  message:
  DFHAP0002 A severe error (code X'1954') has occurred in
                      module DFHAPLI1.
  
  Code 1954 invovles lock manager- indicates LE Lock/Unlock Err
  
  Then the region locks up, with many tasks stuck in LMQUEUE
  waits.
  A dump at the time of the hang shows the tasks waiting on
  the LE_LOCK.  It appears the task that owned the lock went
  away without releasing it.
  .
  Looking at the times of the LMQUEUE suspends, we found it always
  related to an entry in the Kernel Error table..with the same
  time stamp. The ERROR TYPE  of this entry was always
   'DEFERRED ABEND' for an AKC3- a purge request.
  
  Turns out the processing of this deferred abend in DFHAPLI1, can
  cause a task- owning this LE_LOCK, to terminate without ever
  unlocking it.
  Additional Symptom(s) Search Keyword(s): KIXREVxxx
  hang locked up purge while in  first dispatch
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Many tasks waiting on the LE_LOCK after *
  *                      a call to Language Environment          *
  *                      program_check_recovery.                 *
  ****************************************************************
  A task abends between acquiring the LE_LOCK and setting flag
  le_lock_acquired. This means that the lock is never freed and
  then many tasks hang, waiting on the lock.
  

Problem conclusion

• DFHAPLI1 has been changed to release the LE_LOCK in the event
  of a problem occurring between the lock being acquired and
  le_lock_acquired being turned on.
  

Temporary fix

Comments

APAR Information

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

  PI97817

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

  UI62294

Modules/Macros

• DFHAPLI1 DFHAPLI2 DFHAPLI3
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R200 PSY UI62294

     UP19/04/04 P F904

Fix is available

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