IT39511: An amqrmppa process terminates unexpectedly with XC027005 FDC, clients receive MQRC_CONNECTION_BROKEN(2009)

APAR status

• Closed as program error.

Error description

• A client channel closed and a AMQ9788W: Slow DNS lookup for
  address '[ip_address]' error was issued, then the server-side
  channel process amqrmppa terminated which resulted in multiple
  MQ client connections being broken with MQRC 2009.  On the MQ
  server a failure data capture (FDC) record with probe id
  XC027005 was produced as follows:
  
  Probe Id          :- XC027005
  Component         :- xcsRequestMutexSem
  Program Name      :- amqrmppa
  Thread            :- nnn    RemoteResponder
  Major Errorcode   :- STOP
  Probe Description :- AMQ6109S: An internal IBM MQ Appliance
  error has occurred.
  
  MQM Function Stack
  cciResponderThread
  rppAdjustPool
  rppFindPID
  rppLockPool
  xcsRequestMutexSem
  xcsFFST
  

Local fix

• Change the SHARECNV attribute on the failing SVRCONN channel to
  2 or higher.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  MQ systems with SVRCONN channels configured to use SHARECNV(1)
  that have client applications connected and using the
  async-consume API
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  After a client channel disconnected unexpectedly, MQ's reverse
  DNS lookup (so that it could include the hostname in the pending
  AMQ9209E message) took longer than 5 seconds and  timed-out.
  The MQ code reported the following:
  
  AMQ9788W: Slow DNS lookup for address '[ip_address]'.
  
  followed by:
  
  AMQ9209E: Connection to host '[hostname]' for channel
  '[channel_name]' closed.
  
  The MQ code then attempted to free the channel resources but a
  defect in MQ's error reporting code had invalidated the channel
  state which caused an error and FFST in the channel cleanup.
  

Problem conclusion

• The defect has been fixed so the channel cleanup completes
  without error.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.6
  v9.x CD    9.3.0.0
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  MQ APPL M2002 V

• Fixed component ID

  5737H4701

Applicable component levels