IV74498: CRASH IN INVALID EXCEPTION __DOTHROWV6 WITH QHOT=LEVEL=0

XL C/C++ for AIX Fix Pack 22 (September 2015 PTF) for 11.1
XL C for AIX Fix Pack 23 (March 2016 PTF) for 11.1
XL C/C++ for AIX Fix Pack 23 (March 2016 PTF) for 11.1
XL C for AIX Fix Pack 24 (September 2016 PTF) for 11.1
XL C/C++ for AIX Fix Pack 24 (September 2016 PTF) for 11.1
XL C for AIX Fix Pack 22 (September 2015 PTF) for 11.1

APAR status

• Closed as program error.

Error description

• When compiling with higher levels of optimization that enable
  -qhot=level=0 or higher, an invalid exception state occurs and a
  segmentation fault is seen in the exception handling
  __DoThrowV6() routine.
  
  The issue is sensitive to small code changes.
  

Local fix

• NA
  

Problem summary

• USERS AFFECTED:
  C++ users with exception handling code may be affected by this
  issue.
  
  PROBLEM DESCRIPTION:
  Users may see a segfault due to erroneous execution of a catch
  clause.
  

Problem conclusion

• The fix was to recognize a particular internal form of the
  exception and catch it.
  

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:

Fix information

• Fixed component name

  XL C FOR AIX

• Fixed component ID

  5724X1200

Applicable component levels

• RB10 PSY

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