PM66044: DFHUEM ISSUES EXCLUSIVE LOCK EPBCHAIN CONSECUTIVELY AND RECEIVES DUPLICATE_LOCK_OWNER, BECAUSE OF AN INLINE CALL FAILING.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Dump shows DFHUEM at BASE 4.2 issues Exclusive Lock for EPBCHAIN
  consecutively and receives DUPLICATE_LOCK_OWNER. The macro lock
  request is issued twice from routine EPB_LOCK_FAIL. The reason
  we are issuing a macro Lock Manager call is due to the Inline
  call failing. AUEL abend results.
  Additional Keywords: AbendAUEL kixrer
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend AUEL is experienced when CICS     *
  *                      command DISABLE is executed.            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The customer issues CICS command DISABLE to disable a exit
  program. DFHUEM routine DISABLE is linked to handle it. It
  needs to exclusively lock EPBCHAIN and then update related
  flags. An inline call is firstly executed which try to lock
  the EPBCHAIN. Since the lock is currently owned by other task,
  a macro call request is linked and then take the EPBCHAIN
  lock successfully.
  Before the inline call, instruction STMG is executed to save
  the registers' value, while after the macro call, instruction
  LM is executed to restore the registers' value. Since the
  instructions for saving and restoring registers are not
  corresponding(one for 64 bit and one for 31 bit), registers
  can not be restored correctly. That cause the macro call
  request is executed twice and AUEL abend is experienced.
  

Problem conclusion

• DFHUEM has been changed so that the instructions which are
  executed to save and restore the registers' value are
  corresponding.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UK80381

Modules/Macros

•    DFHUEM
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R700 PSY UK80381

     UP12/07/31 P F207

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.