IV73799: CRASH IN BASIC_STRING AFTER EXCEPTION HANDLING

XL C/C++ for AIX Fix Pack 4 (July 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 5 (November 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 6 (February 2016 PTF) for 13.1
XL C/C++ for AIX Fix Pack 7 (May 2016 PTF) for 13.1
XL C/C++ for AIX Fix Pack 8 (August 2016 PTF) for 13.1
XL C/C++ for AIX Fix Pack 9 (June 2017 PTF) for 13.1
XL C/C++ for AIX Fix Pack 10 (February 2018 PTF) for 13.1
XL C/C++ for AIX Fix Pack 11 (November 2018 PTF) for 13.1

APAR status

• Closed as program error.

Error description

• After a complex IF statement, a thrown exception causes the
  program to crash after the exception handling __DoThrowV6()
  call. The stacktrace points to a basic_string destructor:
  
  
     === STACK TRACE ===
  
  statics.std::_UseFacet<std::num_put<wchar_t,std::ostreambuf_iter
  ator<wchar_t,std::char_traits<wchar_t> > >,1>::_Use(const
  
  std::locale&,const std::locale::facet*&,const
  
  std::locale::facet*).std::basic_string<char,std::char_traits<cha
  r>,std::allocator<char> >::_Tidy(bool)(??, ??) at 0xd3ec93a8
  
  std::basic_string<char,std::char_traits<char>,std::allocator<cha
  r> >::?basic_string()(??, ??) at 0xd3ec91a0
  
  test.std::basic_string<char,std::char_traits<char>,std::allocato
  r<char> >::__dftdt()(0x2ff21590) at 0x10001058
  
  invokedtr.__Invoke__Destructor() at 0xd14d4be4
  
  __DoThrowV6() at 0xd14d6b78
  
  test(Nry&)(0x2ff21690) at 0x10000d30
  
  main(0x1, 0x2ff21730) at 0x10000e08
  

Local fix

• None.  Occurance of the issue is sensitive to minor code logic
  changes.
  

Problem summary

• PROBLEM DESCRIPTION:
  The compiler is removing certain temporary values that have
  exception entries in them, causing incorrect behaviour.
  
  USERS AFFECTED:
  Users with compound conditional statements with copy
  constructors in them.
  

Problem conclusion

• The compiler now prevents the exception entries from being
  removed by preventing variable replacement during temporary
  elimination.  The fix has been implemented.
  

Temporary fix

Comments

APAR Information

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

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

  IV74822

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels