LI75120: CORRUPTION OF TRACEBACK TABLE.

October 2009 Update for XL C/C++ for Linux, V10.1
June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
August 2010 Update for XL C/C++ for Linux, V10.1
January 2011 Update for XL C/C++ for Linux, V10.1
January 2012 Update for XL C/C++ for Linux, V10.1
July 2012 Update for XL C/C++ for Linux, V10.1

APAR status

• Closed as program error.

Error description

• A __DoThrowV6 is occuring at runtime during the applications
  exception handling process which leads to a SIGSEGV.
  
  The miscompile happens when a removable function (either from
  using a pragma or from using the Template Registry) with
  exception handling compiled at noopt is mishandled by the
  backend, corrupting one value in a backend table. This in turn
  corrupts the exception handling information for later
  non-removable functions which have no exception handling,
  resulting in them having incorrect traceback tables.  If there
  is a throw while one of those functions is active and in the
  path between the throw and catch, execution might fail.
  

Local fix

• n/a
  

Problem summary

• C++ progams containing an is_removable
  pragma or compiled with the templateegistry option, using
  throw, and compiled at noopt on AIX may experience this issue.
  
  A compiler error sometimes results in an
  incorrect traceback table incorrectly indicating a
  destructor is needed if a throw is done.  A throw
  through that function sometimes causes incorrect
  execution.
  

Problem conclusion

• Changed exception handling to avoid
  corrupting backend table when the exception state variable
  has no owner.
  

Temporary fix

Comments

APAR Information

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

  IZ45744

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

Fix information

• Fixed component name

  XL C/C++ RHEL52

• Fixed component ID

  5724U8310

Applicable component levels

• RA10 PSN IZ45744

     UP06/09/13