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MA46382 - LIC-COMM-TCPIP-WAIT TCP INTERFACE UNUSABLE

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-COMM-TCPIP-WAIT TCP INTERFACE UNUSABLE

Error Description

TCP interface is unusable after network problem. QTCPWRK job    
still shows active, but can't be ended. MSD analysis shows the  
QTCPWRK job waiting on a gate held by an SK-ASC task that is    
waiting on a WaitList.                                          
                                                               
Service Keywords:                                              
QUWAITLIST                                                      
QUTREEQUEUECODE                                                
TELNETSOCKETS                                                  
                                                               
QTVDEVICE job                                                  

Problem Summary

****************************************************************
* PROBLEM: (MA46382) Licensed Program = 5770999 for i 7.2 and  *
*                                       i 7.3                  *
*           Usability of a Product's MAJOR Function            *
*            New Telnet sessions                               *
****************************************************************
* USERS AFFECTED: All IBM i operating system users.            *
****************************************************************
* RECOMMENDATION: Apply LIC PTF MF63619 for i 7.2.             *
*                 Apply LIC PTF MF63620 for i 7.3.             *
****************************************************************
TCP interface is unusable after network problem. QTCPWRK job    
still shows active, but can't be ended. MSD analysis shows the  
QTCPWRK job waiting on a gate held by an SK-ASC task that is    
waiting on a WaitList.                                          

Problem Conclusion

A deadlock was occurring in a small timing window where the    
connection Netstat was working on was also being accessed by    
Telnet to send a Telnet session reject message. The deadlock has
been removed.                                                  

Temporary Fix

                       *********                                
                       * HIPER *                                
                       *********                                

Comments

Circumvention


PTFs Available

R720 MF63619 PTF Cover Letter   7290
R730 MF63620 PTF Cover Letter   7283

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG3CM
Failing Module.......................... RCHMGR
Reported Release................... R720
Duplicate Of..............................




System i Support

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Document Information

Modified date:
28 October 2017