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SE35646 - MQM400 3506(ELOCKED) ENDS QUEUE MANAGER ABRUPTLY

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 APAR (Authorized Program Analysis Report)

Abstract

MQM400 3506(ELOCKED) ENDS QUEUE MANAGER ABRUPTLY

Error Description

User deployed a tool called IFS AUDIT by iTera that utilizes    
the DosSetFileLocks() API which briefly locks an object. At the
time this tool was running, the WMQ checkpoint process kicked  
off and it utilizes the writev() API which accesses WMQ objects
in the IFS.  A WMQ IFS object was held by the DosSetFileLocks()
API when the writev() API attempted to access it during a      
checkpoint. The result was the writev() API returned an ELOCKED
or 3506 rc and the queue manager ended abruptly.                

Problem Summary

****************************************************************
USERS AFFECTED:                                                
WMQ users using the IFS AUDIT tool which internally uses        
DosSetFileLocks() API.                                          
                                                               
Platforms affected:                                            
iSeries                                                        
                                                               
****************************************************************
PROBLEM SUMMARY:                                                
Internally when the write operation is being performed by the  
WMQ using writev API, it finds the portion of the file that is  
being written to is locked. This results in the error 3506      
(ELOCKED) being returned by the API. This caused the AMQALMPX  
process to end abruptly and hence the queue manager.            

Problem Conclusion

A retry operation is being added to the WMQ code, which retries
5 times after each sec. Even if the lock is being held after 5  
sec, the AMQALMPX process would be brought down and hence the  
queue manager.                                                  
                                                               
---------------------------------------------------------------
The fix is targeted for delivery in the following PTFs:        
                                                               
                   v6.0                                        
Platform           Fix Pack 6.0.2.6                            
--------           --------------------                        
iSeries            tbc_p600_0_2_6                              
                                                               
                   v7.0                                        
Platform           Fix Pack 7.0.0.2                            
--------           --------------------                        
iSeries            tbc_p700_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

Circumvention


Disable the locking of IFS files in the iTera Monitoring tool  

while the queue manager is active.                              

PTFs Available

R600 SI47898 PTF Cover Letter   1000

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:
11 December 2012