Re: [Boost-bugs] [Boost C++ Libraries] #11991: Application crashes when yield/resume an coroutine after handing an exception

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11991: Application crashes when yield/resume an coroutine after handing an exception
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-17 08:34:30

#11991: Application crashes when yield/resume an coroutine after handing an
exception
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  chris_kohlhoff
  misko.pawel@…          |     Status:  new
      Type:  Bugs        |  Component:  asio
 Milestone:  To Be       |   Severity:  Problem
  Determined             |   Keywords:  asio coroutine windows Visual
   Version:  Boost       |  Studio 2015
  1.61.0                 |
Resolution:              |
-------------------------+-------------------------------------------------
Changes (by olli):

 * owner:  olli => chris_kohlhoff
 * component:  coroutine => asio

Comment:

 You must not install/call an async_result inside a exception handler
 (catch-block).
 The exception handler might reside on the stack or might removed from the
 stack (including the variables) if left. Especially MS is unspecific what
 happens under the hood (in contrast to C++-Itanium exception ABI).

 A small modification of your code prevents the error (async_result is
 allocated outside the exception handler):


 {{{
 spawn( ios, [&ios]( auto yield ){
         bool failed = false;
         try{
             throw std::runtime_error{ "" };
         }catch( ... ){
             std::cerr << "[1] " << std::endl;
             failed = true;
         }
         if (failed){
             yield_completion_t completion{ yield_context{ yield } };
             auto handler = completion.handler;
             ios.post( [=]
             {
                 std::this_thread::sleep_for( seconds{ 1 } );
                 asio_handler_invoke( handler, &handler );
             } );
             completion.result.get();
             std::cerr << "[2] " << std::endl;
         }
     } );

 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11991#comment:1>
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