OA53761: ABENDEC6 REASON0837048F BPXLKSTE LKKTIMERERROR KTQEALLOCATED KTQEINTERVALSET BPXXKTIM

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer received a dump for ABENDEC6 RSN0837048F.  A problem
  was detected using a Kernel Timer Queue Element (KTQE) for a job
  that issued a SET_TIMER_EVENT (BPX1STE) call.
  
  Additional symptom:
  REASON0836048F RSN0836048F
  Note that issuing csect is BPXLUKW
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of z/OS UNIX System Services for                   *
  * HBB7790 HBB77A0 and HBB77B0.                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ABENDEC6 RSN0837048F                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A possible cause for the ABENDEC6 RSN0837048F is that an
  IRB is issuing a syscall that does a kernwait on top of
  an RB that is in a timed kernwait. The IRB kernwait's
  first ECB gets POSTed. When the RB gets POSTed by
  an event other than the latch ECB, kernwait assumes that
  because the latch ECB (first ECB POSTed during the IRB wait)
  is POSTed that a timer cancel is not needed. This leaves the
  timer event still pending. When this thread issues another
  timer request it finds that the KTQE is in use and issues
  the ABENDEC6 RSN0837048F.
  

Problem conclusion

• The solution is to check the PprtKtqe status when leaving
  kernwait and user kernwait and issuing a timer cancel if
  the KTQE is on the wait or request queues.  This should
  prevent the symptom (ABENDEC6 RSN0837048F) seen by the
  user. If this condition is detected, a dump will be taken
  and the thread will retry and be allowed to continue.
  Additional RAS data is being added to kernpost, kernwait
  and user kernwait to help in determining the actual cause.
  

Temporary fix

Comments

• ×**** PE18/08/30 FIX IN ERROR. SEE APAR OA55944  FOR DESCRIPTION
  ×**** PE18/07/27 FIX IN ERROR. SEE APAR OA55944  FOR DESCRIPTION
  

APAR Information

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

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

  UA96076 UA96077 UA96078

Modules/Macros

• BPXMIDIE BPXLKKP  BPXPRIT  BPXLKKW  BPXLUKW
  

Fix information

• Fixed component name

  OPENMVS SYS SRV

• Fixed component ID

  5695SCPX1

Applicable component levels

• R7B0 PSY UA96076

     UP18/05/09 P F805

• R7A0 PSY UA96077

     UP18/05/09 P F805

• R790 PSY UA96078

     UP18/05/09 P F805

Fix is available

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