[Boost-bugs] [Boost C++ Libraries] #10337: weak_ptr & shared_ptr causes double "delete" -> crash

Subject: [Boost-bugs] [Boost C++ Libraries] #10337: weak_ptr & shared_ptr causes double "delete" -> crash
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-08-10 15:57:00

#10337: weak_ptr & shared_ptr causes double "delete" -> crash
------------------------------+-----------------------
 Reporter:  thesaint1987@…    |      Owner:  pdimov
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  smart_ptr
  Version:  Boost 1.53.0      |   Severity:  Problem
 Keywords:                    |
------------------------------+-----------------------
 I am not sure why this happens (VS2005 - VS2013) and specifically on
 windows (code compiles and runs fine on linux)...

 The following is the boost code that is responsible:

     void sp_counted_impl_p<T>::release() // nothrow
     {
         if( BOOST_INTERLOCKED_DECREMENT( &use_count_ ) == 0 )
         {
             dispose();
             weak_release();
         }
     }

     void sp_counted_impl_p<T>::weak_release() // nothrow
     {
         if( BOOST_INTERLOCKED_DECREMENT( &weak_count_ ) == 0 )
         {
             destroy();
         }
     }

 Look what MUST happen, when "use_count = 1" and "weak_count = 1".. It
 causes a double release which crashes the application. That was a real
 pain in the ass to track down and unfortunately I have nothing to
 specifically trigger this issue either. Just look at the code and it
 should be obvious that this is a race condition.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10337>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.