Hi Everybody,

we're experiencing a little problem here (with Eigen 3.0.3 and 3.0.6):

Using Ubuntu 12.04 (32-bit !) we are compiling our application using Eigen3 and in the Debug configuration we're always getting assertion failures like this one:

Eigen/src/Core/MapBase.h:172: void Eigen::MapBase<Derived, 0>::checkSanity() const [with Derived = Eigen::Map<const Eigen::Array<float, 4, 1, 0, 4, 1>, 1, Eigen::Stride<0, 0> >]: Assertion `(!(internal::traits<Derived>::Flags&AlignedBit) || ((size_t(m_data) % (sizeof(Scalar)*internal::packet_traits<Scalar>::size)) == 0)) && "data is not aligned"' failed.

although we defined the following macros project wide (and checked that the definitions are effective where the assert fails):

#define EIGEN_DONT_VECTORIZE
#define EIGEN_DISABLE_UNALIGNED_ARRAY_ASSERT

The code actually works well in the release build, but it prevents debugging the 32-bit build. Interestingly this doesn't happen on 64bit.

I also found some people on the net having the same problem, but I couldn't find any solution to this. Can somebody suggest what we should try to resolve the problem?

Best Regards
Rainer

are you sure you tried with Eigen 3.0.6? This should definitely work fine, and if an error you get, then it must be different.

for the record, here is the related fix pushed in 3.0.4: https://bitbucket.org/eigen/eigen/commi ... dee89bf3d5

Hi Gael,

thanks for your suggestions and sorry for my late reply!

I definitely checked that this is Eigen 3.0.6, and the assert looks as in the change you mentioned. But somehow the Aligned flag is set anyways.

I could reproduce this now even in Visual Studio, which makes me think that I'm doing something wrong. I attached two screenshots for you. One containing the project-wide preprocessor defines, and one showing the state in the debugger right at the point where the assertion failed. Is this of any help for you? How could I track this down further? Maybe you see something in the stack trace?

http://dl.voigt-home.net/temporary/eigen3_assertion_failure/AssertionFailure.png
http://dl.voigt-home.net/temporary/eigen3_assertion_failure/PreprocessorDefines.png

Regards,
Rainer

As i aslo have the same problem describled in your post, checkSanity() fails despite DISABLE_UNALIGNED_ARRAY_ASSERT , to define EIGEN_DONT_VECTORIZE may work well in my Slam project used with Eigen vision 3.2.9, but the results don't meet the ture values,.
Could you tell me your finally method to slove the issue?
Thanks a lot!

Are you using stableNorm? I recently (like 2 days ago!) fixed a such an issue there. Otherwise, please, let us know more about the code triggering the issue.