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IV56143: PPP ON POWER7 WITH AIX7 CRASH IN IPINTR_NOQUEUE_POST_FW() APPLIES TO AIX 7100-03

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APAR status

  • Closed as program error.

Error description

  • PPP crashed in ipintr_noqueue_post_fw() due to SKEY
violation. Only on Power7/AIX7 combo

Stack:
 netinet:ipintr_noqueue_post_fw+000B84
 netinet:ipintr_noqueue+000120
 Netintr+0002FC
 netisr_thread+000020
 threadentry+000088

  (0)> status
CPU INTR      TID  TSLOT     PID  PSLOT  PROC_NAME
  0         230047     35  140028     20  gil     <<<<

(0)> vmlog
Most recent VMM errorlog entry
Error id               =  DSI_PROC
Exception DSISR/ISISR  =  0000000000200000
Exception srval        =  0000000082031510
Exception virt addr    =  F1000A0310150018
Exception value        =  0000010E  EXCEPT_SKEY <<<<

In this case PPP interface received packets are processed
by the AIX gil thread.

Local fix

  • Work around is to ensure that the ppp ip address does not
hash to ANY ethernet ip address/broadcast address.
EX:
This would expose the problem.
10.71.4.255 =  0x0A4704FF   (enX broadcast addr)
>  print (unsigned int)0x0A4704FF % 229(0xE5);
unsigned int  = 29(0x0000001d)

192.168.254.135 = 0xC0A8FE87 (pp0 assigned addr)
> print (unsigned int)0xC0A8FE87 % 229 (0xE5);
unsigned int  = 29(0x0000001d)

In this case the workaround is to change pp0 address by
one to 192.168.254.136

Problem summary

  • When processing ppp(point to point protocol) packet, AIX
machine can crash with storage key exception, with the
following stack trace:

netinet:ipintr_noqueue_post_fw+000B84
netinet:ipintr_noqueue+000120
Netintr+0002FC
netisr_thread+000020
threadentry+000088

Problem conclusion

  • Modified code to add the required storage keys which avoids the
crash.

Temporary fix

  • 



Comments


    

  • 6100-07 - use AIX APAR IV58201
6100-08 - use AIX APAR IV57783
6100-09 - use AIX APAR IV56154
6100-09 - use AIX APAR IV56154
6100-09 - use AIX APAR IV56154
7100-01 - use AIX APAR IV57485
7100-02 - use AIX APAR IV53819
7100-03 - use AIX APAR IV56143
7100-04 - use AIX APAR IV56172

    



APAR Information




    

  • APAR number
    IV56143
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2014-03-03
    • 

  • Closed date
    2014-03-03
    • 

  • Last modified date
    2016-05-10
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    
IV53819
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U858978
       UP14/05/22  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11R","label":"AIX 7.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            10 May 2016
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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