IT34856: HIGH CPU USAGE ON WINDOWS IF A NAMED PIPE BECOMES INVALID WHILE IT IS BEING WRITTEN TO

APAR status

• Closed as program error.

Error description

• The product uses Windows named pipes for inter-process
  communication. If a named pipe becomes invalid, for any reason,
  while a thread is attempting to write data to the pipe then
  that thread will get stuck in a loop. This thread will never
  exit and will consume a large amount of CPU.
  
  A service trace
  will show the thread stuck in the function ImbNamedPipe::send
  whereas a stack trace will show the same thread stuck in the
  function ImbNamedPipe::sendTimeout.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of IBM Integration Bus v10 and IBM App Connect
  Enterprise v11 on Windows
  
  
  Platforms affected:
  Windows on x86-64 platform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The product uses Windows named pipes for inter-process
  communication. If a named pipe becomes invalid, for any reason,
  while a thread is attempting to write data to the pipe then that
  thread will get stuck in a loop. This thread will never exit and
  will consume a large amount of CPU.
  
  A service trace will show the thread stuck in the function
  ImbNamedPipe::send whereas a stack trace will show the same
  thread stuck in the function ImbNamedPipe::sendTimeout.
  

Problem conclusion

• An exception will now be thrown when the named pipe breaks in
  unexpected ways during data transfer.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.23
  v11.0      11.0.0.11
  
  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