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IJ45426: APPLICATIONS BUILT WITH XL C/C++ FOR AIX, V16.1 USING IPA/PDF MAY SEGFAULT WHEN RUN WITH C++ RUNTIME FOR AIX, V17.1.1.1 PTF

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APAR status

  • Closed as program error.

Error description

  • An application compiled with XL C/C++ for AIX, V16.1 using
IPA/PDF when run on the C++ Runtime for AIX, V17.1.1.1 PTF
may lead to a coredump.

This APAR is being used to mark the previous XL C/C++ for AIX,
V17.1.1.1 PTF as a PE PTF.

Local fix

  • N/a

Problem summary

  • USERS AFFECTED:
Users whose applications are built by XLC/C++ V16.1 for AIX
xlclang++ compiler and running against the XL Open V17.1.1.1 C++
runtime and make use of C++ exception handling,
and either specify '#pragma execution_frequency' in conjunction
with an optimization option or are compiled with -qpdf2 in
conjunction with an optimization option may be affected by this
issue.

PROBLEM DESCRIPTION:
The V17.1.1.1 C++ runtime's personality routine for V16.1
xlclang++ compiler generated applications uses the stack to pass
the exception object to the landing pad.
The landing pad retrieves the exception object with a call to
the runtime function __xlc_exception_handle(). The
implementation incorrectly assumes that __xlc_exception_handle()
should go up one stack frame to get to the stack frame of the
caller of __xlc_exception_handle(), which is supposedly the
stack frame of the function containing the landing pad.
However, this does not always work, e.g., the xlclang++ compiler
generates a wrapper of __xlc_exception_handle() and calls the
wrapper from the landing pad for optimization purposes.

Problem conclusion

  • This problem is pervasive and should be fixed. This APAR is
being used to mark the previous V17.1.1.1 PTF as a PE PTF.
Since this is a problem in the XL Open V17.1.1 C++ runtime that
affects the binary compatibility with XLC/C++ V16.1 compiled
applications,
the fix is in the XL Open V17.1.1 C++ runtime not in XLC/C++
V16.1 compiler or runtime.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ45426
    • 

  • Reported component name
    XL C/C++ FOR AI
    • 

  • Reported component ID
    5725C7200
    • 

  • Reported release
    H11
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-02-15
    • 

  • Closed date
    2023-02-27
    • 

  • Last modified date
    2023-02-27
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    XL C/C++ FOR AI
    • 

  • Fixed component ID
    5725C7200
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSGH3R","label":"XL C\/C++ for AIX"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"H11","Line of Business":{"code":"LOB57","label":"Power"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            27 February 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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