Fixes are available
May 2012 PTF for XL C/C++ for AIX, V10.1
January 2013 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 18 (July 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 19 (October 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 21 (October 2015 PTF) for 10.1
May 2011 PTF for XL C/C++ for AIX, V10.1
October 2011 PTF for XL C/C++ for AIX, V10.1
February 2012 PTF for XL C/C++ for AIX, V10.1
September 2012 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 20 (October 2014 PTF) for 10.1
APAR status
Closed as program error.
Error description
An application has runtime segmentation fault. The segfault is caused by memory corruption when calling a destructor of the same class allocated on stack twice. Second (wrong) time is called when throw() is executed. __DoThrowV6 on stack. If changing the code from : ? to if-else, problem disappears. A reduced test case follows: ========== TEST CASE: ========== $cat t.C && xlC t.C && ./a.out extern "C" int printf(const char *, ...); struct S { S(int i) { printf("S::S(%d), this = 0x%lx\n", i, this); } ~S() { printf("S::~S(), this = 0x%lx\n", this); } S(const S&) { printf("S(const S&), this = 0x%lx\n", this);} }; void bar(S s) { } void foo(bool b, S* p) { bar(b ? *p : S(2)); throw 42; } int main() { try { S s(1); foo(true, &s); } catch(int i) { printf("caught\n"); } return 0; } ============== ACTUAL OUTPUT: ============== S::S(1), this = 0x2ff229a0 S(const S&), this = 0x2ff22908 S::~S(), this = 0x2ff22908 S::~S(), this = 0x2ff22908 S::~S(), this = 0x2ff229a0 caught ================ EXPECTED OUTPUT: ================ S::S(1), this = 0x2ff229a0 S(const S&), this = 0x2ff22908 S::~S(), this = 0x2ff22908 S::~S(), this = 0x2ff229a0 caught (constructor and destructor pairs should match)
Local fix
Replace conditional expressions with 'if else'.
Problem summary
PROBLEM DESCRIPTION: Double destruction of temporaries may occur in code using conditional expressions. USERS AFFECTED: Conditional expression used in copy-by-value argument.
Problem conclusion
A fix is available to ensure the exception handling state is corrected in the affected cases. Apply applicable service.
Temporary fix
Comments
APAR Information
APAR number
IZ97834
Reported component name
XL C++ AIX
Reported component ID
5724U8100
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-03-31
Closed date
2011-03-31
Last modified date
2011-03-31
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++ AIX
Fixed component ID
5724U8100
Applicable component levels
[{"Line of Business":{"code":"LOB08","label":"Cognitive Systems"},"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSJT9L","label":"XL C\/C++"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"A.1"}]
Document Information
Modified date:
06 October 2021