OA60558: ABEND138 RSN02470003 IN BPXPRIN1 DUB MSGSND ZOSMF IZUFPROC

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer received dump of ABEND138 RSN02470003 from one of
  their zOSMF workflows:
  
  COMPON=BPX,COMPID=SCPX1,ISSUER=BPXMIPCE,MODULE=BPXPRIN1+????????
  ,ABEND=S0138,REASON=02470003
  
     In another customer case, a user attempted to logon to their
  environment from an OEM multi-session manager, and when that
  hung, they disconnected and ended up with the same ABEND138
  RSN02470003.
  
  
  PROBLEM DETAILS:
     In both cases described above, CEA initiated a TSO LOGON.
  Following a TPUT, CEA issued a msgsnd syscall under a
  non-jobstep task that drove dub processing.  In one case, dub
  processing (BPXPRIN2) hung because the user's HOME file
  system was migrated.  In another case, dub processing
  (BPXPRIN2) was hung in a vfs_mount to zFS trying to mount the
  user's home directory.  At the point in dub processing that
  BPXPRIN2 accesses the user's home directory, the StcbOtcb has
  been set (non-zero) for the task, but the X_STCBODUB flag has
  not yet been set.
     While hung trying to access the user's home directory,
  an ATTENTION was issued, which gave control to the TSO
  ATTENTION exit (IEAVAR05) under an IRB.  The exit
  processing issued a TPUT of 'LOGON', and CEA once again issued
  a msgsnd syscall.  Since X_STCBODUB was not set, dub processing
  was driven once again.  BPXPRIN1 already held an ENQ from the
  first dub attempt, so the second dub attempt resulted in an
  ABEND138 in BPXPRIN1 when BPXPRIN1 tried to obtain the same ENQ
  again.
     Code was added via APAR OA58837 to address this ENQ issue
  under the jobstep task and the ensuing dub loop, but this ENQ
  issue also needs to be addressed under a non-jobstep task.
  
  
  VERIFICATION STEPS:
  1.) From the recovery dump taken for the ABEND138 during
      BPXPRIN1 processing, confirm tha the abend occurred
      under a non-jobstep task.
  
  2.) Review the task structure for the abending task to verify
      that dub processing was hung in the window of BPXPRIN1
      processing where StcbOtcb is non-zero, but X_STCBODUB is
      zero.  Note that the dubbing task holds ENQ SYSZBPX
      PROCINIT during this time.
  
  3.) Later in the task structures, look for an IRB (e.g. TSO
      ATTENTION EXIT) that interrupted this hung dub request.
  
  4.) Following the IRB, verify that another dub request was
      driven under this same nob-jobstep task, leading to the
      ABEND138 when BPXPRIN1 tries to obtain the ENQ SYSZBPX
      PROCINIT again that it already holds from the first
      interrupted dub request.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of z/OS UNIX System Services for HBB77C0 and       *
  * above.                                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ABEND138 RSN02470003 IN BPXPRIN1 attempting to get an ENQ    *
  * that is already held by the calling task.                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• Add code to check if the ENQ is held by the requesting task
  before attempting to obtain the ENQ again.
  

Temporary fix

Comments

• ×**** PE23/03/17 FIX IN ERROR. SEE APAR OA64549  FOR DESCRIPTION
  ×**** PE23/03/17 FIX IN ERROR. SEE APAR OA64549  FOR DESCRIPTION
  ×**** PE24/10/30 FIX IN ERROR. SEE APAR OA67167  FOR DESCRIPTION
  

APAR Information

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

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

  UJ06008 UJ06009 OA63015

Modules/Macros

• BPXPRIN1
  

Fix information

• Fixed component name

  OPENMVS SYS SRV

• Fixed component ID

  5695SCPX1

Applicable component levels

• R7C0 PSY UJ06008

     UP21/07/21 P F107

• R7D0 PSY UJ06009

     UP21/07/21 P F107

Fix is available

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