boost:shared_ptr destructor, SIGBUS, MIPS 64

3 Jan 2012

      I am using a STL list of boost shared pointer in my code and and it
randomly dumps core. Below is the code snippet and the core stack.

class A ()

{

    virtual ~A();

    string getsomestring();

}

class B: public A

{

}

typedef shared_ptr<A> A_ptr;

class C // singelton class

{

public:

getList(list & temp_list)

{

    list::iterator itr = _inv.begin();

    for( ; itr != _inv.end(); itr++ ) {

        temp_list.push_back( (*itr) );

}

getListContent ( list<string>& str_list)

{

    list::iterator itr = _inv.begin();

    for( ; itr != _inv.end(); itr++ ) {

        str_list.push_back( (*itr)->getsomestring() );

    }

}

private:

list  _inv;

}

main()

{

C *c= new C; // create an instance ( its a singleton class)

// On creating an instance of C, the private member variable inventory is
populated.

// inventory.push_back(A_ptr(new FRU ( fvar )))

thread 1 {

list var1;

c->getList(var1);

list <string> var2;

c->getListContent(var2);

}  // End of thread

delete c;

}  // end of main

Now this code works fine for some iterations and then dumps core with the
following stack

######################

Thread 1 (Thread 0x55567f7af0 (LWP 23773)):

#0  0x0000000120038ecc in boost::detail::atomic_decrement (pw=0xa)

sysroot/usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp:66

#1  0x0000000120038f44 in boost::detail::sp_counted_base::release (this=0x2)

#2  0x00000001200390ac in boost::detail::shared_count::~shared_count
(this=0x1200b08d8, __in_chrg=<value optimized out>)

#3  0x000000012003eaf4 in boost::shared_ptr<A>::~shared_ptr
(this=0x1200b08d0, __in_chrg=<value optimized out>)

#4  0x000000012003eb4c in __gnu_cxx::new_allocator
...
::destroy (this=0xffffeaf640, __p=0x1200b08d0)
#5  0x000000012003c9e0 in std::_List_base >::_M_clear (this=0x1200a8ee8)

#6  0x000000012003b4ac in std::_List_base >::~_List_base (this=0x1200a8ee8,
__in_chrg=<value optimized out>)

#7  0x000000012003a0e8 in std::list >::~list (this=0x1200a8ee8,
__in_chrg=<value optimized out>)

#8  0x0000000120068b64 in C::~C (this=0x1200a8e70, __in_chrg=<value
optimized out>)

######################################################

This code is cross compiled for MIPS64 arch on linux x86_64 machine and is
running on a 64 bit MIPS machine. I am not sure why it is dumping core. It
dumps core giving a *SIGBUS* error. Do i have to specifically handle the
delete operation of the List ? I am using the default destructor for "C"
class and there is no pointers in the class A and Class A also doesnt have
anything in its destructor, no memory allocations are done in Class A. Any
suggestions regarding this problem would be highly helpful.

sumanth krishna

Peter Dimov

sumanth krishna

Peter Dimov

sumanth krishna

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