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IT14460: AN FDC OCCURS WHEN USING A CLIENT APPLICATION WITH MULTICAST TOPICS WHEN TRACING IS ENABLED.

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When an application uses a TOPIC with COMMINFO(xxx)
MCAST(ENABLED) and client tracing is enabled then the
application throws an FDC with a footprint similar to the
following:
| LVLS       						:- 7.5.0.6

									
						|
| Product Long Name 	:- WebSphere MQ for Linux (x86-64
platform) 						|
| Vendor      					:- IBM

												&#09
;				|
| Installation Path 			:- /opt/mqm75

												&#09
;	|
| Installation Name 		:- Installation4  (4)
                			
											|
| Probe Id     					:- XC130003

												&#09
;		|
| Application Name 		:- MQM
												&#09
;			|
| Component     				:- xehExceptionHandler

											|
| SCCS Info     					:-
/build/slot1/p750_P/src/lib/cs/unix/amqxerrx.c,
				|
| Line Number    				:- 1433

												&#09
;			|
| Build Date    					:- Feb 26 2016
                    					
									|
| Build Level    				:- p750-006-160226

												|
| Build Type    					:- IKAP - (Production)

												|
| Program Name   			:- amqspubc

												&#09
;	|
| Arguments     				:-

												&#09
;					|
| Addressing mode  		:- 64-bit
												&#09
;			|
| LANG       						:- en_US.UTF-8

												&#09
;	|
| Process      					:- 7680

												&#09
;			|
| Process(Thread)  			:- 7687
                        	
												&#09
;		|
| Thread      						:- 3

												&#09
;				|
| ThreadingModel  			:- PosixThreads

												&#09
;	|
| UserApp      					:- TRUE

												&#09
;			|
| Last HQC     					:- 0.0.0-0

												&#09
;			|
| Last HSHMEMB   			:- 0.0.0-0

												&#09
;			|
| Major Errorcode  			:- STOP
                        			
												&#09
;|
| Minor Errorcode  			:- OK

												&#09
;				|
| Probe Type    				:- HALT6109

												&#09
;	|
| Probe Severity  				:- 1

												&#09
;				|
| Probe Description 		:- AMQ6109: An internal WebSphere
MQ error has occurred. 	|
| FDCSequenceNumber 	:- 0
												&#09
;				|
| Arith1      						:- 11 (0xb)

												&#09
;		|
| Comment1     				:- SIGSEGV: address not
mapped((nil))           							|
|
												&#09
;												|&#
09;
+---------------------------------------------------------------
----------------------------+
O/S Call Stack for current thread
/opt/mqm75/lib64/libmqe_r.so(+0x2408de)[0x7fce9db008de]
/opt/mqm75/lib64/libmqe_r.so(+0x25950d)[0x7fce9db1950d]
/opt/mqm75/lib64/libmqe_r.so(+0x25818e)[0x7fce9db1818e]
/opt/mqm75/lib64/libmqe_r.so(+0x25b920)[0x7fce9db1b920]
/opt/mqm75/lib64/libmqe_r.so(+0x255b9e)[0x7fce9db15b9e]
/lib64/libpthread.so.0[0x351c00f7e0]
/opt/mqm75/lib64/libmqe_r.so(+0x2ebe9a)[0x7fce9dbabe9a]
/opt/mqm75/lib64/libmqe_r.so(+0x56404e)[0x7fce9de2404e]
/opt/mqm75/lib64/libmqe_r.so(+0x59e199)[0x7fce9de5e199]
/opt/mqm75/lib64/libmqe_r.so(+0x5d66e4)[0x7fce9de966e4]
/opt/mqm75/lib64/libmqe_r.so(+0x5d77ae)[0x7fce9de977ae]
/opt/mqm75/lib64/libmqe_r.so(+0x2a8343)[0x7fce9db68343]
/lib64/libpthread.so.0[0x351c007aa1]
/lib64/libc.so.6(clone+0x6d)[0x351b8e893d]

MQM Function Stack
Rmm.send_stream_packets
Rmm.send_single_packet
Rmm.rmmSendPacket
xcsFFST

MQM Trace History
{ xcsRequestThreadMutexSem
} xcsRequestThreadMutexSem rc=OK
{ xcsRequestThreadMutexSem
} xcsRequestThreadMutexSem rc=OK
{ xcsReleaseThreadMutexSem
} xcsReleaseThreadMutexSem rc=OK
{ xcsReleaseThreadMutexSem
} xcsReleaseThreadMutexSem rc=OK
{ xihCSThreadClear
-{ xcsEmptyCBM
-} xcsEmptyCBM rc=OK
} xihCSThreadClear rc=OK
{ xppInitialiseDestructorRegistrations
} xppInitialiseDestructorRegistrations rc=OK
{ xcsInitialize
-{ xihCSThreadClear
--{ xcsEmptyCBM
--} xcsEmptyCBM rc=OK
-} xihCSThreadClear rc=OK
-{ xcsRequestThreadMutexSem
-} xcsRequestThreadMutexSem rc=OK
-{ xcsRequestThreadMutexSem
-} xcsRequestThreadMutexSem rc=OK
-{ xcsReleaseThreadMutexSem
-} xcsReleaseThreadMutexSem rc=OK
-{ xcsGetEnvironmentString
-} xcsGetEnvironmentString rc=xecE_E_ENV_VAR_NOT_FOUND
-{ xcsReleaseThreadMutexSem
-} xcsReleaseThreadMutexSem rc=OK
} xcsInitialize rc=OK
{ Rmm.send_stream_packets
-{ Rmm.send_single_packet
--{ Rmm.rmmSendPacket
---{ Rmm.sendmsg
---} Rmm.sendmsg rc=Unknown(4D)
---{ xcsFFST

Local fix

  • 



Problem summary


    

  • ****************************************************************
USERS AFFECTED:
Users of MQ V7.5 or 8 with TOPICS that specify the
MCAST(ENABLED) property.


Platforms affected:
MultiPlatform

****************************************************************
PROBLEM DESCRIPTION:
A programming error meant that it was possible for the MQ
tracing routines to attempt to access a null pointer under the
circumstances described above, resulting in a SIGSEGV signal
being sent to MQ by the operating system.

    



Problem conclusion


    

  • The WebSphere MQ tracing routines have been corrected to avoid
the SIGSEGV.

---------------------------------------------------------------
The fix is targeted for delivery in the following PTFs:

Version    Maintenance Level
v7.5       7.5.0.7
v8.0       8.0.0.2

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 number
    IT14460
    • 

  • Reported component name
    WMQ BASE MULTIP
    • 

  • Reported component ID
    5724H7241
    • 

  • Reported release
    750
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2016-03-24
    • 

  • Closed date
    2016-04-21
    • 

  • Last modified date
    2016-04-21
    • 





    

  • 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


    








      
              
                            

              

              [{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSDEZSF","label":"IBM WebSphere MQ Managed File Transfer for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.5","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            31 March 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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