IT28248: CLEANING UP OF EDU CAUSES PRIVATE MEMORY TO LEAK (WINDOWS PLATFORM ONLY)

Db2 Version 11.1 Mod 4 Fix Pack 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• This issue is specific to Db2 running under Windows operating
  system only and with version 11.1 mod 4 fix pack 4. When a EDU
  is released from serving an application it will leak a private
  memory block. Depending on the configuration and number of
  connections coming in/out the leak might grow rather quickly.
  
  The type of blocks leaked will be visible in a "db2fodc -memory"
  output file "db2pd.memblocks.private". In this file, the persist
  pool of the private memory will be the main consumer with a
  large count of blocks:
  
  ...
  Total size for persist pool: 7673057192 bytes (PoolID: 86,
  SecondID: 0, PoolAddr: 0x000001504C280498)
  Total size for Private memory set: 7673668136 bytes
  
  All memory consumers in Private memory set:
  PoolAddr          PoolID    PoolName  SecondID
  TotalSize(Bytes)    %Bytes TotalCount %Count  LOC  File
  0x000001504C280498 86        persist   0
  7663597408          99.87 216388      99.43  476  4284367586
  0x000001504C280498 86        persist   0
  6549088             0.09  52           0.02  196  1235720678
  0x000001504C280498 86        persist   0
  1159264             0.02  490          0.23  244  4283993058
  0x000001504C280498 86        persist   0
  786432              0.01  6            0.00 5176  745254192
  ...
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Db2 running on Windows environment only                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * upgrade to Db2 version 11.1 mod 4 fp5                        *
  ****************************************************************
  

Problem conclusion

• first fixed in Db2 version 11.1 mod 4 fp5
  

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:

  IT30794 IT31299

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSY

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