largest matrix size by the LAPACKE_dsyevr

 Hi,

  I am trying to diagonalize a square matrix of size N=73789, with a MKL LAPACKE_dsyevr, and
need to find all the eigenvalues and eigenvectors. The machine I am running on uses
Intel(R) C++ Intel(R) 64 Compiler for applications running on Intel(R) 64, Version 18.0.2.199 Build 20180210
and has 3TB of RAM. The matrix itself occupies ~44 G. The code calls the
  info = LAPACKE_dsyevr( LAPACK_COL_MAJOR, 'V', 'A', 'U', N, A, LDA,
                        vl, vu, il, iu, abstol, &m, W, Z, LDZ, ISUPPZ );
 successfully, and spends about ~6000 minutes in the routine (it multithreads with the available processors),
and the memory requirement is steady.
 However, when it seems it is nearly finished, there is a segmentation fault (core dumped).
 
 Can anyone tell me why this is happening? Or if this is too big a matrix to be used with dsyevr?
 Thanks,

 Debasish