Hi,

I am using Eigen 3.3 on Ubuntu 12.10, gcc 4.6.3.
I got SIGSEGV on line 63 of SparseDenseProduct.h. It looks like LhsInnterIterator points to an invalid location.
I get the same error with optimizaitons turned on or off, OpenMP on or off.
I don't know if this matters, but in my case this sparse-dense product originates from line 43 of ConjugateGradient.h.
The sparse solve works fine when I switch to SimplicialLDLT.

Please let me know if there are things I can do to help track the problem.

Thanks,

Jun Saito

Please, paste the relevant code snippet so that there is chance for us to reproduce the issue.

Luckily, I was able to reproduce the problem with a smaller code. Here it is:

https://github.com/dukecyto/admm-elasti ... teGradient

Now I know that the problem happens with older Eigen (3.2.5) and on OSX El Capitan.
I will keep on investigating the problem, but I would really appreciate it if you can look into it as well.

Forget this. I just found out the problem.
I was expecting compute() in IterativeLinearSolvers to make a copy of the matrix like direct solvers do.
I just needed to keep the copy of the matrix on my end.

Sorry about the confusion.