[CppAD] attempt to return memory not in use

[Michael Braun]

Hi.

I have a rather complex use case for CppAD that is generating an error.  Unfortunately, I cannot construct a simple, reproducible case, but I am hoping someone can point me in the right direction to diagnose the problem.

I have written a class that includes an ADFun<double> as a member.  I am then exposing my C++ class in R, and then calling the C++ member functions using the Rcpp modules functionality.

If I launch R, run my R script, construct an object from the C++  class, everything works fine.  But then, after I delete the C++ object, unload the dynamic library, and start over again, I get the following error after trying to load in completely unrelated data:

cppad-20120227 error from a known source:
return_memory: attempt to return memory not in use
v_ptr    = 0x7fa4739037b8
thread   = 0
capacity = 972
See CPPAD_TRACE_THREAD & CPPAD_TRACE_CAPACITY in
# include <cppad/thread_alloc.hpp>

Error detected by false result for
    false
at line 982 in the file 
    /opt/cppad/include/cppad/thread_alloc.hpp
Assertion failed: (false), function CppAD::ErrorHandler::Default, file /opt/cppad/include/cppad/error_handler.hpp, line 217.

What's interesting is that when I get this error message, the object of the class that uses CppAD should have already been deleted.  And this error pops up long before I call the constructor.  It is only after I restart R that I can run my program again.  So this makes me think that something is going on with how CppAD re-allocates memory.

I am not doing anything special to de-allocate the ADFun or AD objects at all?  Should I?  Also, I am not running any multi-threaded code, so I am not invoking "parallel mode."  I was not able to find an example of using CppAD in parallel mode, even if the application itself is sequential.

Can you offer some suggestions on what to look for, or explain what might might cause CppAD to want to return memory that is not in use?

Thanks,

Michael






Michael Braun 
MIT Sloan School of Management
braunm at mit.edu
-------------------------------------------------- 
View my research at
http://braunm.scripts.mit.edu/

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