IT29281: MQ process hang after memory exception SIGSEGV

APAR status

• Closed as program error.

Error description

• A queue manager process (for example, amqrmppa) did not respond
  after receiving a memory exception (SIGSEGV) and a partial
  failure data capture (FDC) record was generated.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of MQ in the unlikely event that a memory exception is
  generated within heap management routines (a possible cause of
  this is corruption of the heap memory).
  
  
  Platforms affected:
  AIX, Linux on Power, HP-UX Itanium, Solaris x86-64, Solaris
  SPARC, Linux on zSeries, Linux on x86-64, Linux on x86, IBM
  iSeries
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  To obtain information about the process, the MQ signal handler
  had called the C library function fopen() marked as
  non-async-signal-safe.  This caused a secondary memory
  exception, whose signature was a partially-written FDC record
  and the process did not respond after the exception.
  

Problem conclusion

• The call to fopen() to obtain information about the process has
  been moved to earlier in the life of the program, so that it is
  not called from the signal handler.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.14
  v9.0 LTS   9.0.0.8
  v9.1 CD    9.1.4
  v9.1 LTS   9.1.0.4
  
  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

  5724H7241

Applicable component levels