IT10942: MQ FDC PROBEID XC130003 SIGBUS: INVALID ADDRESS ALIGNMENT

APAR status

• Closed as program error.

Error description

• An FDC with Probe Identifier XC130003 is generated in the
  vpiConvertData function during
  an MQGET MQI call that uses a version 1 MQMD.
  
  An MQ function stack similar to this may be seen in the FDC:
  
  MQM Function Stack
  MQGET
  zstMQGET
  vpiConvertData
  xcsFFST
  

Local fix

• The address of buffers passed on the MQI should be aligned on at
  least a 4-byte boundary. This problem will not occur if buffers
  are correctly aligned.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users who pass unaligned buffers into the MQI on platforms with
  strict alignment rules may be affected by this problem.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  MQ received a buffer from the application which
  is not aligned on at least a 4-byte boundary. Code which
  adds an MQMDE to the message data then manipulated this
  buffer and caused a SIGBUS.
  
  Although providing an unaligned buffer on the MQI goes against
  the documented rules for specifying a message
  buffer, MQ should not SIGBUS if presented with
  unaligned data.
  

Problem conclusion

• The code was changed to cope with the possibility that the input
  buffer may be passed in at an unaligned address.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.5
  
  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 BASE MULTIP

• Fixed component ID

  5724H7251

Applicable component levels

• R800 PSY

     UP