IT32695: UNEXPLAINED CPU ACTIVITY AFTER AN HTTP TIMEOUT.

APAR status

• Closed as program error.

Error description

• If a message flow thread processing a message received through
  an HTTP Input node is terminated without sending an HTTP reply
  from the same thread, and the message being processed this way
  times out, the HTTP Input node may fail to correctly recall the
  HTTP message stored earlier for use during the timeout,
  potentially leading to unexplained CPU activity inhibiting
  shutdown and correct timeout processing.
  
  Additional Symptom(s) Search Keyword(s):
  

Local fix

• NA
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  <span style="font-family:courier new,courier,monospace"><span
  style="font-size:14px">IBM App Connect Enterprise V11 users with
  http flows.  </span></span>
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  <span style="font-size:14px"><span style="font-family:courier
  new,courier,monospace"><span style="background-color:rgb(255,
  255, 255);color:rgb(0, 0, 0)">If a message flow thread
  processing a message received through </span><span
  style="background-color:rgb(255, 255, 255);color:rgb(0, 0,
  0)">an HTTP Input node is terminated without sending an HTTP
  reply </span><span style="background-color:rgb(255, 255,
  255);color:rgb(0, 0, 0)">from the same thread, and the message
  being processed this way </span><span
  style="background-color:rgb(255, 255, 255);color:rgb(0, 0,
  0)">times out, the HTTP Input node may fail to correctly recall
  the </span><span style="background-color:rgb(255, 255,
  255);color:rgb(0, 0, 0)">HTTP message stored earlier for use
  during the timeout, </span><span
  style="background-color:rgb(255, 255, 255);color:rgb(0, 0,
  0)">potentially leading to unexplained CPU activity inhibiting
  </span><span style="background-color:rgb(255, 255,
  255);color:rgb(0, 0, 0)">shutdown and correct timeout
  processing.
  
  Thread stack taken at the time of failure will show below calls
  in the stack:</span></span></span>
   <p style="margin-left:0px">ImbStringBase::assignInternal</p><p
  style="margin-left:0px">Imb::EvHtp::request::getOriginalMsgAsBlo
  b
  ImbWSInputNode::MessageLoopContext::handleSingleMessage</p><p
  style="margin-left:0px">ImbWSInputNode::readQueue</p>
  

Problem conclusion

• <span style="font-size:14px"><span style="font-family:courier
  new,courier,monospace"><span style="background-color:rgb(248,
  248, 248);color:rgb(29, 28, 29)">The product no longer fails and
  cause a hang when http timeout occurres</span></span></span>
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v11.0      11.0.0.9
  
  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

  APP CONNECT ENT

• Fixed component ID

  5724J0550

Applicable component levels

• RB00 PSY

     UP