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MA47215 - LIC-OTHER-WAIT DEADLOCK CONDITION DUE TO CONTENTION ON RESIDENT STACKS

 APAR (Authorized Program Analysis Report)

Abstract

LIC-OTHER-WAIT DEADLOCK CONDITION DUE TO CONTENTION ON RESIDENT
STACKS

Error Description

Deadlock condition due to an object (QuPool) on which page      
fault handling is dependent can be locked while executing on a  
pageable stack. A deadlock can occur if a page fault occurs    
while the pool lock is held. System will hang.                  
Deadlock condition due to contention on the resident stack pool
while waiting for I/O completions. The outstanding I/O will not
complete until I/O error recovery completes,  however a task    
used for I/O error recovery can not acquire a resident stack to
run on.                                                        

Problem Summary

Please see the ERROR DESCRIPTION section.                      

Problem Conclusion

Licensed Internal Code will be changed to allow a task needed by
the I/O error path to run on a reserved stack when using methods
that require a stack switch to a pool stack. This will allow I/O
error recovery to complete even when the normal stack pool is  
depleted.                                                      

Temporary Fix

Comments

Circumvention


PTFs Available

R720 MF65220 PTF Cover Letter   9123
R730 MF65208 PTF Cover Letter   9116

Affected Modules

         
         

Affected Publications

Summary Information

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




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Document information

More support for: i family

Software version: V6R1M1, V7R1M0, V7R2M0, V7R3M0

Operating system(s): OS/400

Reference #: MA47215

Modified date: 29 August 2019