IT28579: DEADLOCK IN TCPIP NODES.

APAR status

• Closed as program error.

Error description

• Under some workloads where TCPIP connections are either
  unreliable or there is a large amount of socket openign and
  closing then it is possible to hit a deadlock in the TCPIP
  Nodes due to taking locks in an incorrect order. Examining a
  java core file will show one or more threads blocked in
  WaitingForReadDataState.getReadyConnections or
  AvailableForReadState.forceToCloseState and one or more threads
  blocked in Connection.giveBackRead.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of IBM Integration Bus version 10 or App Connect
  Enterprise v11 using the TCP/IP Nodes.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  <span style="background-color:rgb(255, 255, 255)">Under some
  workloads where TCPIP connections are either </span><span
  style="background-color:rgb(255, 255, 255)">unreliable or there
  is a large amount of socket opening and </span><span
  style="background-color:rgb(255, 255, 255)">closing then it is
  possible to hit a deadlock in the TCPIP </span><span
  style="background-color:rgb(255, 255, 255)">Nodes due to taking
  locks in an incorrect order. Examining a  </span><span
  style="background-color:rgb(255, 255, 255)">java core file will
  show one or more threads blocked in </span><span
  style="background-color:rgb(255, 255,
  255)">WaitingForReadDataState.getReadyConnections or
  </span><span style="background-color:rgb(255, 255,
  255)">AvailableForReadState.forceToCloseState and one or more
  threads </span><span style="background-color:rgb(255, 255,
  255)">blocked in Connection.giveBackRead.        </span>
  

Problem conclusion

• Locks are now taken in the correct order so the deadlock no
  longer occurs.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.19
  v11.0      11.0.0.7
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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

  INTEGRATION BUS

• Fixed component ID

  5724J0540

Applicable component levels