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MA45149 - TCPIP-OTHER-INCORROUT IP STOPS WORKING SOME MINUTES AFTER IPL

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 APAR (Authorized Program Analysis Report)

Abstract

TCPIP-OTHER-INCORROUT IP STOPS WORKING SOME MINUTES AFTER IPL

Error Description

TCP/IP stops working some minutes after IPL. Console is working.
IP interfaces can not stop. This fail with TCP2670.            
                                                               
Service Keywords:                                              
Gate Wait - gate initilized by ENDTCPABN while in use          
ToIpListBase SkRefCount                                        

Problem Summary

****************************************************************
* PROBLEM: (MA45149) Licensed Program = 5770999 for i 7.2      *
*           Crash Hang Requiring an IPL to Recover             *
****************************************************************
* USERS AFFECTED: All IBM i operating system users.            *
****************************************************************
* RECOMMENDATION: Apply LIC PTF MF61097 for i 7.2.             *
****************************************************************
********                                                        
TCP/IP stops working some minutes after IPL. Console is working.
IP interfaces can not stop. This fail with TCP2670.            

Problem Conclusion

A race condition could lead to not releasing a reference to an  
object. That then can cause a subsequent hang. This race        
condition can occur when IPv6 packets are being received and may
be more likely if the service tools LAN adapter is shared with  
the system TCP/IP stack and IPv6 is enabled on the service tools
adapter (the default).                                          
                                                               
The failure to release the reference under the race condition  
has been corrected which will prevent the hang.                

Temporary Fix

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

Comments

Circumvention


If the service tools LAN adapter is shared with the system,    

moving it to a separate adapter or disabling IPv6 on the service
tools adapter will reduce the likelihood of this hang.          
                                                               
To disable IPv6 on the service tools adapter, change parameter  
"IP version allowed" in the Service Tools Lan Adapter          
configuration from BOTH to IPV4, or use the OPSCONSOLE advanced
analysis macro with "CNFGLAN -ipver IPV4" parameters.          

PTFs Available

R720 MF61097 PTF Cover Letter   6127
R730 MF61159 PTF Cover Letter   6085

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG3TC
Failing Module.......................... RCHMGR
Reported Release................... R720
Duplicate Of..............................




System i Support

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Document Information

Modified date:
24 May 2016