PI37417: ABEND UFFD-00000090 on DDF startup when LE POSIX is enabled at system level prior to DB2 DDF startup

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DB2DDF DB2HANG defect pi37417 dpi37417
  ABEND ABNDUFFD-00000090 M=DSNVEUS3 is issued for the DIST
  asid on DB2 startup when POSIX(ON) has been set at the system
  level prior to DB2 or DDF being started.
  DB2 startup may show "complete" but DB2 may hang if DDF
  automatically starting due to DDF initialization not
  
  
  ABNDUFFD is an abend U4093.
  The Dump failing psw will point into LE module CEEPIPI
  
  An example of the command to set POSIX(ON) would be
  SETCEE CEEDOPT,POSIX(ON)
  If this SETCEE is done with DB2 already started and active,
  there is no impact.
  ***************************************************************
  Additional Symptoms and Keywords:
   POSIX
   Abend ABENDUFFD  ABNDUFFD  ABENDFFD  ABNDFFD  UFFD  FFD
         ABENDU4093 ABNDU4093 ABEND4093 ABND4093 U4093 4093
    ABNDUFFD-00000090 00000090 RC00000090
   ABEND0C4 AB0C4 S00C4 0C4
    0C4-00000010 00000010 RC00000010
     DSNLTRTP DSNLTRTP+04C8 04C8 OFFSET04C8
   ABEND04E AB04E S004E 04E
    04E-00F3040B 00F3040B RC00F3040B
     DSN3SSTM DSN3SSTM+03EE 03EE OFFSET03EE
  

Local fix

• local workaround/fix: If POSIX(ON) has been set at the lpar
  level, disable POSIX(ON) prior to starting DB2. Allow DB2
  startup and DDF initialization to complete before enabling
  POSIX(ON) at the lpar level.
  Command SETCEE CEEDOPT,POSIX(OFF) can be used
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Distributed Data Facility (DDF) users.   *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend FFD-00000090 during DDF start     *
  *                      processing if LE POSIX system level     *
  *                      default is enabled.                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The user has enabled LE POSIX as the system level default via
  the LE "SETCEE CEEDOPT,POSIX(ON)" command.
  This causes an LE abend U4093 with reason 00000090 during DDF
  start processing and DDF start processing will not complete.
  If DDF start processing is automatically initiated as part of
  DB2 start processing, DB2 start processing will also not
  complete.  Once this condition occurs, DDF cannot be stopped or
  restarted because it's still in a starting state (message
  DSNL023I).  DB2 must be abnormally terminated (ex: via MVS
  "Cancel ssnmDIST" command) in order to get back into a state
  where DDF (and DB2) can be started.
  The user must first disable LE POSIX as the system level
  default via the LE "SETCEE CEEDOPT,POSIX(OFF)" command in order
  for the DDF start to succeed.
  DDF start processing must initialize an LE environment into
  internal (TCB based) system tasks.  DB2/DDF does not require an
  LE POSIX environment for these tasks and therefore makes no
  effort to clean up unwanted resources that might otherwise
  exist relative to an LE POSIX environment.  However, DB2 does
  not explicitly specify that POSIX is not required and therefore
  did not consider that an LE POSIX environment may have been
  initialized anyway as a result of a system level default.  As a
  result, LE detects an abend 4093-00000090 condition when
  DB2/DDF attempts to initialize an LE environment into the
  second system task.
  

Problem conclusion

• For system tasks that do not require an LE POSIX environment,
  DDF start processing has been changed to explicitly specify
  that a POSIX environment is not required, thereby avoiding any
  conflict with the system level default.
  

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:

  UI26410 UI26411

Modules/Macros

• DSNLILE
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UI26410

     UP15/04/15 P F504

• RB10 PSY UI26411

     UP15/04/15 P F504

Fix is available

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