IZ90121: WMQ APPLICATION FAILS TO CONNECT TO QUEUE MANAGER AND RECEIVES FDC XY029004 WHEN SOCKET DESCRIPTOR EXCEEDS FD_SETSIZE(1024)

WebSphere MQ V7.0 Fix Pack 7.0.1.5
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.5

APAR status

• Closed as program error.

Error description

• A WebSphere MQ application fails to connect to the queue
  manager and receives the following FDC:
  
  Probe Id          :- XY029004
  Component         :- xllOurSocket
  Major Errorcode   :- xecX_E_RESOURCE_ERROR
  Probe Type        :- INCORROUT
  Probe Description :- AMQ6125: An internal WebSphere MQ error has
  occurred
  Arith2            :- 1024 (0x400)
  Comment1          :- Socket number 1054 exceeds fd_setsize(1024)
  
  MQM Function Stack
  Java_com_ibm_mq_jmqi_local_internal_base_Native_MQCONNX
  MQCONNX
  zstMQCONNX
  zstMQConnect
  ziiMQCONN
  ziiConnectToAgent
  zcpAttachPipe
  xcsRequestMutexSem
  xllRequestSocketMutex
  xcsFFST
  
  This problem occurs for applications that use a large number of
  file descriptors such as MQ Java applications running in
  WebSphere Application Server (WAS) or in any other application
  server.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users running WebSphere MQ V7 applications which use more than
  1024 file descriptors in a single process; for example a JVM
  running inside an application server which runs WebSphere MQ
  applications.
  
  Platforms affected:
  All Unix
  
  ****************************************************************
  PROBLEM SUMMARY:
  WebSphere MQ uses select or poll system calls for file
  descriptor multiplexing. The select system call fails with
  EBADF error when the "number of file descriptors" argument
  exceeds the FD_SETSIZE limit in some conditions on some
  platforms. This error causes the failure in MQCONN.
  

Problem conclusion

• WebSphere MQ has been modified to allow applications to use
  poll instead of select for file descriptor multiplexing.
  
  To enable WebSphere MQ to use poll, export the environment
  variable AMQ_DONT_USE_SELECT_FOR_SOCKMTX to a non null value.
  The export of this environment variable should be performed in
  the applications environment.
  
  Example:
  
  export AMQ_DONT_USE_SELECT_FOR_SOCKMTX=1
  Restart the queue manager, listener and the applications
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.5
  --------           --------------------
  AIX                U839183
  HP-UX (PA-RISC)    U839621
  HP-UX (Itanium)    U839626
  Solaris (SPARC)    U839622
  Solaris (x86-64)   U839628
  Linux (x86)        U839623
  Linux (x86-64)     U839627
  Linux (zSeries)    U839624
  Linux (Power)      U839625
  
  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

  WMQ LIN X86 V7

• Fixed component ID

  5724H7224

Applicable component levels

• R701 PSY

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