Toby St Clere Smithe <[email protected]>
writes:
> So having split up my sources, I'm having trouble with shared
> pointers. It seems that because of the way the sources have been split
> into a number of functions, some pointer goes out of scope and gets
> dereferenced twice.. I'm not sure the problem is in ViennaCL, but
> something tricky is happening here at the interface between Python,
> Boost and ViennaCL..
Then, bizarrely, when I use Valgrind, I get some success:
...
Test: initialisation of vector with CPU scalar passed
Test: initialisation of vector with ndarray passed
Test: initialisation of vector with Vector passed
Test: negation passed
ERROR 2013-12-20 22:18:57,950 pyviennacl.pycore 2754 execute
EXCEPTION EXECUTING: Assign(Scalar, Dot(Vector, Vector)=>Scalar)=>NoResult
Traceback (most recent call last):
File "../tests/pyviennacl/vector_operations.py", line 458, in <module>
sys.exit(test())
File "../tests/pyviennacl/vector_operations.py", line 444, in test
test_vector_slice(run_test, epsilon, p.float32, 11)
File
"/home/toby/src/viennacl/pyviennacl-dev/tests/pyviennacl/test_common.py", line
124, in test_vector_slice
dtype = dtype)
File "../tests/pyviennacl/vector_operations.py", line 72, in run_test
act_diff = math.fabs(X - Y)
File
"/home/toby/src/viennacl/pyviennacl-dev/build/pyviennacl/build/lib.linux-x86_64-2.7/pyviennacl/pycore.py",
line 458, in __sub__
return self.value - rhs
File
"/home/toby/src/viennacl/pyviennacl-dev/build/pyviennacl/build/lib.linux-x86_64-2.7/pyviennacl/pycore.py",
line 2107, in value
return self.result.value
File
"/home/toby/src/viennacl/pyviennacl-dev/build/pyviennacl/build/lib.linux-x86_64-2.7/pyviennacl/pycore.py",
line 2085, in result
self.execute()
File
"/home/toby/src/viennacl/pyviennacl-dev/build/pyviennacl/build/lib.linux-x86_64-2.7/pyviennacl/pycore.py",
line 2096, in execute
self._result = s.execute()
File
"/home/toby/src/viennacl/pyviennacl-dev/build/pyviennacl/build/lib.linux-x86_64-2.7/pyviennacl/pycore.py",
line 2752, in execute
self.vcl_statement.execute()
RuntimeError: ViennaCL: Internal memory error: unknown memory handle!
ToolObject::processDone( 1, 0 )
...
And without either Valgrind or gdb, the error is not a double free, but
"Error in `python': invalid fastbin entry (free): 0x00000000013aa550"...
Does anyone have a good reference for scoping and shared pointers in
C++? Or should I just try and write some code reproducing this sort of
error? (This may mean the 1.0.0 release has to wait till 2014..)
Toby
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