IT25750: SIGKILL ORIGINATING FROM DB2STOP FORCE NODENUM XX

Db2 Version 11.1 Mod4 Fix Pack4 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 4 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 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 7 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• db2sysc sends SIGKILL to itself which generates FODC_Panic
  diagnostics when stopping nodes concurrently. This affects
  multiple partition systems.
  
  Reproduce by running the script below. This example uses 4
  partition system.
  
  #!/bin/sh
  db2 "activate db t"
  sleep 1
  db2stop force nodenum 1 &
  db2stop force nodenum 3 &
  db2stop force nodenum 2 &
  db2stop force nodenum 0 &
  sleep 1
  db2stop force nodenum 0 &
  db2stop force nodenum 3 &
  db2stop force nodenum 1 &
  db2stop force nodenum 2 &
  sleep 1
  db2stop force nodenum 3 &
  db2stop force nodenum 0 &
  db2stop force nodenum 3 &
  db2stop force nodenum 1 &
  sleep 1
  db2stop force nodenum 1 &
  db2stop force nodenum 3 &
  db2stop force nodenum 0 &
  db2stop force nodenum 2 &
  
  
  NOTES:
  a) By default this fix is disabled. To enable this fix, set DB2
  registry variable DB2_PMODEL_SETTINGS=PARALLEL_SINGLE_STOP:TRUE
  then restart DB2 instance for new change to take effect
  b) Can only be enabled on DPF instance which has more than one
  member
  

Local fix

• Two alternatives:
  a) "db2stop force" parallel db2stop on all nodes, but it lets
  DB2 decide order to stop each node
  OR
  b) Execute "db2stop force on nodenum xx" sequentially instead of
  concurrently as per the reproduction script.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 11.1 Mod 4 Fixpack 4 or higher                *
  ****************************************************************
  

Problem conclusion

• First fixed in Db2 11.1 Mod 4 Fixpack 4
  

Temporary fix

• See LOCAL 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

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