IT27634: Queue manager hangs following a SIGSEGV while contacting the LDAP server

APAR status

• Closed as program error.

Error description

• If a SIGSEGV or similar memory exception happens while
  contacting the LDAP server for user/group information, then
  later queue manager operations involving user/group lookups hang
  permanently.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of a queue manager that suffers a memory exception (for
  example a SIGSEGV) in the area of code within the queue manager
  authorization service (also called the OAM) implementing LDAP
  connectivity.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  Because of the memory exception, the LDAP client code had not
  released a mutex.  A later call to the LDAP client code from the
  same MQ queue manager process, using the same LDAP context
  handle, hung because it waited for that mutex.  The mutex is
  never released, making this a permanent hang in the queue
  manager.
  

Problem conclusion

• The MQ code has been changed so that the LDAP context handle is
  not used again, following a SIGSEGV or similar memory exception
  in this area of the queue manager.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.12
  v9.0 LTS   9.0.0.6
  v9.1 CD    9.1.2
  v9.1 LTS   9.1.0.2
  
  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

  IBM MQ APPL M20

• Fixed component ID

  5725Z0900

Applicable component levels