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MA47625 - LIC-OTHER-WAIT Partition hang during LPM

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-OTHER-WAIT Partition hang during LPM

Error Description

Logical Partition Migration (LPM) validates and completes      
successfully, but upon normal IOP reset on the destination      
partition before the lpar is available, tape page faults are    
using the same recovery queue as the Load Source; causing a    
deadlock situation.                                            

Problem Summary

A partition hangs during device error recovery.  The SRC        
A6xx0266 (e.g., SRCA6000266) would typically be displayed.      

Problem Conclusion

A non-critical task is taking a page fault on its stack while  
using a critical work queue.  This causes deadlock on the queue,
between that task and critical recovery, such as recovery for  
the load source device.  With this fix, all tasks will run on  
resident (non-pageable) stacks while accessing this queue.      
                                                               
This problem is far more likely to occur on partitions that use
I/O devices attached to virtual adapters.   In particular,      
partitions that have both (1) disk devices and (2) tape and/or  
optical devices attached to virtual adapters can encounter the  
mix of critical and non-critical error recovery described above,
when outages in the hosting partition occur.  Partitions in this
environment should apply this PTF as soon as possible.  In this
situation, the PTF should also be permanently applied.          
                                                               
This issue has never been seen on partitions that use only      
physical I/O adapters assigned directly to the partition - in  
that case customers may wish to avoid disruption to their      
business and wait for the next maintenance window to apply this
fix.                                                            

Temporary Fix

Comments

Circumvention


To limit exposure to this issue in a virtual I/O environment,  

customers should avoid actions that cause temporary outages of  
the hosting partition (such as rebooting a VIOS server or      
performing Logical Partition Mobility) until this PTF is        
applied.  Unscheduled outages cannot be completely prevented,  
but this will reduce risk of the exposure.                      

PTFs Available

R720 MF65976 PTF Cover Letter   9297
R730 MF66028 PTF Cover Letter   9311
R740 MF66029 PTF Cover Letter   9304

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG300
Failing Module.......................... RCHMGR
Reported Release................... R720
Duplicate Of..............................




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Document Information

Modified date:
16 November 2019