IT38312: Missing trace while processing secure socket read and write, andSIGSEGV memory exception

APAR status

• Closed as program error.

Error description

• SIGSEGV memory exception and missing trace in amqrmppa process.
  
  Call stack from the failure data capture (FDC) generated by the
  process contains lines similar to these:
  
  /opt/mqm/lib64/libmqmcs_r.so(xehExceptionHandler+n)
  /lib64/libpthread.so.0(+n)
  :
  :
  /opt/mqm/lib64/libmqmr_r.so(cciTcpSslWriteCallback+n)
  :
  :
  /opt/mqm/lib64/libmqmr_r.so(ccigsk_secure_soc_read+n)
  /opt/mqm/lib64/libmqmr_r.so(cciSslSecureReceive+n)
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Queue managers that serve client application programs over
  TCP/IP using TLS secured connections.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  After reading data from the client, the secure sockets code
  (GSKit) on the MQ server behaves normally by calling back into
  MQ code to send data to the network, to perform some
  handshaking.  The MQ code uses the wrong thread context to write
  trace, resulting in the trace being written in the wrong place,
  and in the worst case a memory exception (SIGSEGV) may occur.
  This happens in the amqrmppa process.
  

Problem conclusion

• The IBM MQ code has been corrected to avoid using the wrong
  thread context.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 LTS   9.1.0.10
  v9.x CD    9.2.5
  
  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

  IBM MQ BASE MP

• Fixed component ID

  5724H7271

Applicable component levels