IT42903: BIPHTTPLISTENER PROCESS EXHIBITS HIGH CPU

APAR status

• Closed as program error.

Error description

• biphttplistener process may exhibit very high cpu even with
  moderate load. The procstack output shows that some threads  are
  looping in compression/decompression function.
  
  ---------- tid# 42075303 (pthread ID:  10282) ----------
  0x090000002d115008  inflate(??, ??) + 0x1f0
  0x09000000267ec7dc  Imb::WSBase::Inflate::ZStream::inflate(Imb:
  :WSBase::Inflate::ZStream::Type,bool, evbuffer*, ImbCommonBuffer
  0x15c
  0x09000000267ec4e4
  Imb::WSBase::Inflate::inflate(ImbCompression::Type, evbuffer*,
  ImbCommonBuffer&, Imb::WSBase::DecompressionInfo*, int)(??, ??,
  ??, ??, ??) + 0x54
  0x09000000267ed0a4  Imb::WSBase::Inflate::operator()(evbuffer*,
  ImbCommonBuffer&, Imb::WSBase::DecompressionInfo*)(??, ??, ??,
  ??) + 0x124
  0x0900000030ba8768
  Imb::EvHtp::Request::addBodyData(ImbCommonBuffer&, bool,
  Imb::WSBase::DecompressionInfo*)(??, ??, ??, ??) + 0x208
  0x0900000030aff340  Imb::HTTPListener::ProtoHandler::handle(Imb
  ::EvHtp::RequestStub)(0x125197020,0x110f30d00, 0x0) + 0x3b0
  0x0900000030bce648  Imb::EvHtp::ListenerRunThread::Internal::Pr
  ocessRequest(evhtp_request*,void*)(??, ??) + 0x3c8
  0x0900000030c2d810  htp__request_parse_fini_(??) + 0x90
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of App Connect Enterprise v12.0 using IntegrationNode
  level HTTP listener
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The node level biphttplistener process may exhibit very high cpu
  even with moderate load. The procstack output may contain some
  threads looping in compression/decompression function as shown
  below:
  
  ---------- tid# 42075303 (pthread ID:  10282) ----------
  inflate(??, ??) + 0x1f0
  Imb::WSBase::Inflate::ZStream::inflate(Imb:
  :WSBase::Inflate::ZStream::Type,bool, evbuffer*,
  ImbCommonBuffer)
  Imb::WSBase::Inflate::inflate(ImbCompression::Type, evbuffer*,
   ImbCommonBuffer&, Imb::WSBase::DecompressionInfo*, int)
  Imb::WSBase::Inflate::operator()(evbuffer*, ImbCommonBuffer&,
  Imb::WSBase::DecompressionInfo*)
  Imb::EvHtp::Request::addBodyData(ImbCommonBuffer&, bool,
  Imb::WSBase::DecompressionInfo*)
  Imb::HTTPListener::ProtoHandler::handle(Imb::EvHtp::RequestStub)
  Imb::EvHtp::ListenerRunThread::Internal::ProcessRequest(evhtp_re
  quest*,void*)
  htp__request_parse_fini_(??)
  

Problem conclusion

• The product has been modified such that the biphttplistener
  process no longer exhibits high cpu when processing request
  messages.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v11.0      11.0.0.21
  v12.0      12.0.8.0
  
  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

  5724J0560

Applicable component levels