[function] rare crash on destroy

25 Jan 2010

      Hello,

In my application I use to "post" a pointer to a dynamically allocated
boost::function to a hidden window in the following manner (WinXP,
MSVC9.0, 1.41):

typedf function Functor;
#define AM_FUNCTOR (WM_USER+79)

// called from some "worker" thread
void post(const Functor &func)
{
  Functor *f = new Functor(func);
  PostMessage(hWind_, AM_FUNCTOR, 0, reinterpret_cast<LPARAM>(f));
}

// Window procedure, called from the window thread
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
 switch(msg)
 {
   case AM_FUNCTOR:
   {
       Functor *f = reinterpret_cast(lParam);
       (*f)();
       delete f;
   }
//....
}

post() is called several times per second.
Sometimes - but *very* rarely - the line "delete f" causes a crash
(Access violation reading location 0xfeeefef6).
The application is compiled with /Ox /GL, linked with /LTCG.
What could be wrong with this code?

Callstack:
function_base.hpp, line 323:
functor_manager_common::manage_small():
  reinterpret_cast(&out_buffer.data)->~Functor(); //
THIS LINE CRASHES

function_base.hpp, line 432:
functor_manager::manage():
  manager(in_buffer, out_buffer, op, tag_type());

The assembly code looks like this:

100134C9  mov   esi,dword ptr [esi+0Ch]
100134CC  test  esi,esi
100134CE  je
boost::detail::function::functor_manager_common::manage_small+9Eh
100134D0  mov   eax,dword ptr [esi]
100134D2  mov   ecx,dword ptr [eax+8]  // CRASHES HERE, as eax == 0xfeeefeee
100134D5  push  esi
100134D6  call   ecx

Thanks in advance.

Igor R

Peter Dimov

Igor R

Roland Bock

Igor R

Roland Bock

Igor R

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