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MA46356 - OSP-OTHER-THREADS-INCORROUT SYSTEM HANG ON CTL QPACTL01 MSCP WAITING ON GATE LOCKED BY SNAPC2QPAIRSTATIC

 APAR (Authorized Program Analysis Report)

Abstract

OSP-OTHER-THREADS-INCORROUT SYSTEM HANG ON CTL QPACTL01 MSCP
WAITING ON GATE LOCKED BY SNAPC2QPAIRSTATIC

Error Description

jobs/tasks waiting for a seize on controller description        
QPACTL01 That job was waiting for a seize on module #mscptsk    
which was held by task MSCP. MSCP had been waiting for almost  
4.4 hours on a gate locked by module SnaPc2QPairStatic          

Problem Summary

System hang. Jobs waiting for a seize on controller QPACTL01.  
That job was waiting for a seize on module #mscptsk which was  
held by task MSCP. MSCP had been waiting for hours on a gate    
locked by module SnaPc2QPairStatic.                            
If a user is logged on, they may run fine. If not, they are    
unable to log in. APPC, Enterprise Extender, and other          
communications controllers may also stop responding to user    
requests such as vary on or vary off due to MSCP task deadlock.
Eventually the console hangs so they have to do a main store    
dump and IPL to recover.                                        

Problem Conclusion

System deadlock on a LIC SNA component gate which is used to    
serialize access to FID2 path control for an APPC controller and
updates to its FID5 path control list for HPRIP/RTP connections.
One of the routines in the RTP connection take down and bring up
path invoked to perform HPR path switches attempted to obtain  
the shared and exclusive lock out of order causing deadlock. The
ordering problem has been fixed by removing the unneeded shared
lock and replacing it with a single exclusive lock request.    

Temporary Fix

Comments

Circumvention


PTFs Available

R610 MF63596 PTF Cover Letter   1000
R611 MF63597 PTF Cover Letter   1000
R710 MF63557 PTF Cover Letter   1000
R720 MF63558 PTF Cover Letter   7290
R730 MF63561 PTF Cover Letter   7283

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... No
Component.................................. 9400DG3CM
Failing Module.......................... RCHMGR
Reported Release................... R710
Duplicate Of..............................




System i Support

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Document information

More support for: i family

Software version: V6R1M0, V6R1M1, V7R1M0, V7R2M0, V7R3M0

Operating system(s): OS/400

Reference #: MA46356

Modified date: 28 October 2017