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SE38098 - WMQ STRMQMCHL OR WRKMQMCHL HANGS WHEN MULTIPLE STRMQMLSR
ARE PERFORMED

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 APAR (Authorized Program Analysis Report)

Abstract

WMQ STRMQMCHL OR WRKMQMCHL HANGS WHEN MULTIPLE STRMQMLSR
ARE PERFORMED

Error Description

Multiple STRMQMLSR commands may deadlock the job AMQZMGR0. This
can cause a hang on STRMQMCHL or WRKMQMLSR *OBJECT commands.    
The call stack for the threads of the AMQZMGR0 job would show a
secondary thread in start MTXW.                                
                                                               
This problem may be encountered in several diffent ways, each  
with different symptoms.  The AMQZMGR0 process is used with the
WMQ Command Server, WMQ Listeners and the Channel Initiator.    
When AMQZMGR0 deadlocks, any job requiring these functions may  
also hang.                                                      

Problem Summary

****************************************************************
USERS AFFECTED:                                                
Users attempting to work with WMQ listeners or channels        
                                                               
Platforms affected:                                            
iSeries                                                        
                                                               
****************************************************************
PROBLEM SUMMARY:                                                
The AMQZMGR0 job has 2 threads that could lock the same Mutex.  
In some cases, when multiple listeners are being started        
repeatedly, these 2 threads could result in a deadlock.        

Problem Conclusion

The code has been modified to alleviate the possibility of these
two threads resulting in a deadlock.                            
                                                               
---------------------------------------------------------------
The fix is targeted for delivery in the following PTFs:        
                                                               
                   v6.0                                        
Platform           Fix Pack 6.0.2.8                            
--------           --------------------                        
iSeries            tbc_p600_0_2_8                              
                                                               
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

Circumvention


PTFs Available

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... No
Component.................................. 5724H7206
Failing Module.......................... RCHMGR
Reported Release................... R600
Duplicate Of..............................




System i Support

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Document Information

Modified date:
09 September 2009