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MA48005 - LIC-OTHER-LOOP DLPAR OPERATION CAUSES LOOP

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-OTHER-LOOP DLPAR OPERATION CAUSES LOOP

Error Description

DLPAR processor changes stop working on an IBM i partition.    
Restart of the partition clears the condition.                  
                                                               
Service Keywords:                                              
Task TDCONFIGCTL looping                                        
systemmonitor shows QuStacklessMsgPoolCode repeatedly          
                                                               
Data collection:                                                
QMGTOOLS SYSSNAP with Servicedocs                              
AA Macro tdconfigctlfr                                          

Problem Summary

Dynamic partition and processor configuration changes are      
handled with a client-server model in LIC.  For a specific      
set of changes identified below, a race condition exists        
between the client(s) and server that can cause the server      
task (TDCONFIGCTLTASK) to loop, consuming processor capacity.  
Once the server task is looping, subsequent requests made by    
clients will not be serviced, and will hang or time-out.        
Recovery from the looping condition requires a partition IPL.  
                                                               
The impacted configuration actions include:                    
                                                               
- Change in processor multi-tasking mode (via QPRCMLTTSK        
  system value)                                                
- Change in SMT context (via QWCCHGPR API)                      
- Change in entitled processor units (typically via HMC)        
- Change in active virtual processors (typically via HMC)      

Problem Conclusion

The race condition is handled properly, resolving the defect.  

Temporary Fix

Comments

Circumvention


PTFs Available

R720 MF66707  0114

R730 MF66708  0128

R740 MF66709  0121

Affected Modules


         
         

Affected Publications

Summary Information

Status............................................CLOSED PER
HIPER...........................................Yes
Component..................................9400DG300
Failing Module..........................RCHMGR
Reported Release...................R730
Duplicate Of..............................




IBM i Support

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Document Information

Modified date:
15 May 2020