OA41950: BPXLKLCP TOD CALCULATION LEAP SECONDS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• BPXLKLCP calls ISGLSLSP GRS latch query service for a list of
  latches currently held. When GRS ISGLSLSR stores the obtained
  time from LqeObtainTime (TOD format) into LsrReq2ObtainTime, it
  converts the TOD value to GMT using ASAXMAC ConvertStckToGMT.
  That conversion factors in leap seconds from CvtLSO. The time
  we use for comparison in BPXLKLCP is in TOD format straight
  from STCK, which does not take leap seconds into consideration.
  That difference is enough to make the current time earlier than
  the obtained time. This, in turn, results in a negative value
  for ElapsedHoldSecs, and the false issuance of the BPXM123E
  message.
  

Local fix

• -
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/OS UNIX System Services for   *
  *                 HBB7770 HBB7780 and HBB7790.                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message MSGBPXM123E is being            *
  *                      incorrectly issued, falsely             *
  *                      identifying latches as being held for   *
  *                      an excessive length of time (> 5        *
  *                      minutes) when they have actually been   *
  *                      held for a short time.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  BPXLKLCP uses the GRS ISGLSLSP service to generate a list of
  latches held without contention.  Each latch entry in the
  output list contains the time the latch was obtained
  (LsrReq2ObtainTime) represented in GMT. GMT time takes leap
  seconds into consideration.  To determine the elapsed time that
  the latch has been held BPXLKLCP subtracts the current time
  (STCK) from the latch obtain time.  Because the latch obtain
  time is in GMT and the current time is STCK format it is
  possible for latch obtain time to appear to be after the
  current time.  This can cause the results of the held time
  calculation to be very large causing false excessive hold time
  messages.
  

Problem conclusion

• Change the latch hold excessive time detection logic in
  BPXLKLCP to convert the current time from STCK format
  to GMT before calculating the elapsed hold time for the
  latch.
  

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:

  UA69153 UA69154 UA69155

Modules/Macros

• BPXLKLCP
  

Fix information

• Fixed component name

  OPENMVS SYS SRV

• Fixed component ID

  5695SCPX1

Applicable component levels

• R770 PSY UA69153

     UP13/05/30 P F305

• R780 PSY UA69154

     UP13/05/30 P F305

• R790 PSY UA69155

     UP13/05/30 P F305

Fix is available

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