Sorry for my "good" english. :) I'am try to use boost.task 0.4.2 in my project. I found some leaks in the files handle.hpp and task.hpp related use_count member initialization. So boost::intrusive_ptr can't release allocated resources. After fixing promblem of the use_count initialization, i ran my unit tests again, but some leaks still living. I discovered that the problem is in the boost.fiber (v 0.5.1). If i try to run compiled unit tests of the boost.fiber manually, the garbage collector of the boost.test shows the leaks. In hopes of finding the place of data leaks, I perform these tests under Rational Purify, but Puify reports that no leaks were detected. Is the garbage collector of the boost.test lies, or the leaks is real!? Tested environment: Windows 7 x64, Windows XP boost 1.42.0 boost.context 0.2.0 boost.task 0.4.2 boost.fiber 0.5.1