IT29170: ADDITIONAL FIX TO APAR IT13674, TEST FOR -NOEXEC MOUNT INCORRECTLY FAILS IN DB2SETUP SCRIPT

APAR status

• Closed as program error.

Error description

• The logic used to fix IT13674 (the underlying DB2 defect) used
  grep -w, or similar, which is insufficient when /tmp is
  overmounted with a different filesystem with correct parameters.
  
  WHY LOCAL FIX DOES NOT WORK:
  Due to /etc/mtab being a link to /proc/self/mounts, it is not
  directly editable.
  Due to /tmp being in use, it cannot be force unmounted twice in
  order to work around this.
  A remount will not work, because the top level mount is valid
  already, and the db2setup checks for this simply do not notice
  it.
  The last entry in mtab is the one that actually is in use.
  mtab is a link to /proc, so that is not editable
  
  
  APAR FIX:
  [root@azesp01b01 install]# pwd
  /sp/software/816srv/repository/native/1/ese/db2/linuxamd64/insta
  ll
  [root@azesp01b01 install]# diff db2setup db2setup.old
  137c137
  < foundit=`mount | grep -w ${TMPDIR?} | tail -1 | grep "noexec"
  2> /dev/null`
  ---
  > foundit=`mount | grep -w ${TMPDIR?} | grep "noexec" 2>
  /dev/null`
  

Local fix

• The new local fix could be move the symlink, create a dummy
  file, run the installer, then move the symlink back.
  Alternatively, mount --move may be an option, or unpack, edit,
  repack com.tivoli.dsm.server.db2.linux.x86_64_11.1.3030.239.zip
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 11.1 FP6 or higher                            *
  ****************************************************************
  

Problem conclusion

• Upgrade to Db2 11.1 FP6 or higher
  

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:

  IT34864 IT34865 IT34866

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels