OA54431: SMSVSAM OPEN DEADLOCK WITH LATCH CONTENTION REPORTED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During open of RLS data set latch contention may be reported and
  a hang / deadlock will be seen.  A d sms,smsvsam,diag(c) will
  shows latch contention on :
  DESCRIPTION: IGWLYSPH - SHM OBJECT POOL
  
  Problem occurs if a QUIESCE request is pending and a system from
  the plex is terminated during the OPEN processing.
  
   Additional Keywords:
  RLSOPEN RLSHANG IGWLYSPH
  SMSVSAM RLS VSAMRLS DF122
  RLSPSP/K
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All VSAM RLS users issuing Quiesce against a non-catalog     *
  * data set                                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * SMSVSAM OPEN of a data set can hang with latch contention    *
  * reported after a Quiesce is issued against that data set     *
  * from a remote system.                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  SMSVSAM obtains an ENQ and a Quiesce lock when opening a data
  set to serialize against the Quiesce data set process.
  When a Quiesce is issued against an open data set from a remote
  system, it will broadcast the request and then wait for
  responses from all the connected servers. If a SMSVSAM server is
  recycled in the middle of the Quiesce data set process, that
  server will release the ENQ without completing the Quiesce data
  set process correctly. A subsequent OPEN of that data set will
  obtain that ENQ, but then wait for the previous Quiesce to
  complete. As a result, the open data set process will hang.
  SMSVSAM must be recycled to release the hang.
  

Problem conclusion

• The Quiesce data set process has been modified to correct the
  serialization error, avoiding the hang. A subsequent open will
  fail with IEC161I 242-0790, indicating that the data set is
  marked as quiesced. The data set will not be able to be opened
  until an Unquiesce is issued against it.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UJ07922 UJ07923 UJ07924

Modules/Macros

• IDAVQDRV
  

Fix information

• Fixed component name

  VSAM REC LEV SH

• Fixed component ID

  5695DF122

Applicable component levels

• R230 PSY UJ07922

     UP22/04/14 P F204 ¢

• R240 PSY UJ07923

     UP22/04/14 P F204 ¢

• R250 PSY UJ07924

     UP22/04/14 P F204 ¢

Fix is available

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