IT26275: UNDER SOME CONDITIONS, A BUFFER OVERFLOW CAN OCCUR WHEN READING FROM BLU PAGES THAN LEADS TO A HANG OR CRASH

APAR status

• Closed as program error.

Error description

• During a huge load of data in a BLU table, the engine might hang
  due to a buffer overflow reading a BLU page in memory.
  
  A stack similar to the following is generated:
  
  offset: 0000000000000E3F in <...::getCodes>
  <S:\...\common\osse\core\inc\ossbit.h:503>
  offset: 0000000000000074 in <...::unpack>
  <S:\...\engn\cde\query\BankUnpacker.cpp:730>
  offset: 00000000000011D3 in <...::processTSNRangeOnPage>
  <S:\...\engn\cde\query\LoadColValueEvaluator.cpp:2547>
  offset: 0000000000000C5D in <...::processTSNRange>
  <S:\...\engn\cde\query\LoadColValueEvaluator.cpp:1633>
  offset: 00000000000005D1 in
  <...::processInputsSynchronously><S:\...\engn\cde\query\LoadColV
  alueEvaluator.cpp:204>
  
  Windows platform are more prone to this problem than the other
  platforms.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 Version 11.1 Mod 4 Fix Pack 4 for Linux,      *
  * UNIX, and Windows                                            *
  ****************************************************************
  

Problem conclusion

• Problem was first fixed in Db2 Version 11.1 Mod 4 Fix Pack 4 for
  Linux, UNIX, and Windows
  

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:

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

     UP