OA59442: CMDMON OUTPUT HAS SOME ENTRIES WITH DATE/TIME = 09/17/42 19:53:47. ADD'L SYMPTOMS BELOW - ABEND0C4 S

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During command statistics collection, some entries in the data
  table are all zeroes.  This results in an interpreted time value
  of all 00's to the wrap time of the system clock - 9/17/2042
  19:53:47.
  add'l symptoms;
  1.  Abend0C4 in module DSICSREC at offset '644' - reg14 bad.
  reg14 is loaded from reg6 +8 where reg6 -> CSWKA, then reg15
  is added which results in invalid storage address.  Overlays
  of CPOOL header occur resulting in other task abends and
  various symptoms seemingly unrelated to CMDMON; eg. IRXTERMA
  not found caused task abend0c4.
  .
  2.  Abend0C4 in module DSIDRS at offset +1DCC.  Reg 4
  contains ebcdic D3C5E7F3 loaded from Reg 3 +18 - storage
  overlaid with CMDMON CSW table data.
  .
  3. Abend0C4 in DSIGMN at 208A Reg8 points to invalid
  storage adadress.  Reg8 loaded from cpool table which
  pointed to cpool cell overlaid by CMDMON CSW table data.
  .
  add'l keywords;
  overlay overlayed abends0c4
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the Command Statistics function *
  *                 of the IBM Z NetView V6R3 program.           *
  ****************************************************************
  * PROBLEM DESCRIPTION: When the Command Statistics function is *
  *                      enabled, users may encounter one or     *
  *                      more of the following symptoms:         *
  *                        * The output of the CMDMON DISPLAY    *
  *                          command shows rows of data that are *
  *                          all x'00' (resulting in the Start   *
  *                          Time and End Time fields showing    *
  *                          date and time stamps of '09/17/42   *
  *                          18:53:47').                         *
  *                        * Message DWO049W appears on the      *
  *                          system console, followed by an      *
  *                          attempted dump of the NetView       *
  *                          address space.                      *
  *                        * Messages DWO115W and/or DWO316W     *
  *                          appear on the system console.       *
  ****************************************************************
  * RECOMMENDATION: Apply the PTF and restart the NetView        *
  *                 program.                                     *
  ****************************************************************
  The Command Statistics function saves data records in a region
  of global NetView storage that is potentially accessed by
  multiple tasks at the same time. For this reason, access to this
  global storage is controlled by a latch. Because the latch being
  obtained is shared, other instructions (such as Compare And
  Swap) are used to ensure that the storage is updated in a
  synchronous manner. However, despite this controlled access,
  users who have configured their systems with many CPUs are
  vulnerable to experiencing the symptoms listed above due to the
  shared latch access, which allows for multiple control block
  fields being updated by multiple tasks at the same time.
  

Problem conclusion

• Module DSICSREC is being changed so that all write access to the
  Command Statistics data table is controlled with an exclusive
  latch. Read access (i.e., CMDMON DISPLAY) remains controlled
  with a shared latch. In addition, another bug was discovered in
  which a manual data capture (using the CMDMON CAPTURE command)
  followed by an automatic capture would potentially result in
  duplicate records being written to the data set that is
  allocated by the capture program (by default, sample CNMSCSDP).
  Module DSICSREC is being changed to correct this problem, so
  that only new data is sent to the capture program every time,
  regardless of whether the capture is manual or automatic.
  

Temporary fix

Comments

APAR Information

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

  OA57433

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

  UJ02967 UJ02968

Modules/Macros

• DSICMDMN DSICSREC DSICSSMF DSIMILOD
  

Fix information

• Fixed component name

  NETVIEW FOR Z/O

• Fixed component ID

  5697NV600

Applicable component levels

• R13B PSY UJ02967

     UP20/05/21 P F005

• R30B PSY UJ02968

     UP20/05/21 P F005

Fix is available

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