Scalapack and large matrix

[john_john]

I try so solve a linear system using a large matrix (use of pzgetrf() for factorization).
When each part of matrix distributed on one process greater than 2Gbytes, it seems that I have problem in pzgetrf(): sigsegv...

My configuration is:
linux 2.6.9-22.ELsmp (x86_64)
gcc&gfortran 4.1.1 (64 bits)
blacs v1.1
scalapack 1.7.1
mpich 1.2.7

On one process, using a matrix [12629x12629] I obtain the same observation.
What could it be?
I try to use a debugger like gdb but I am not an expert in the scalapack algorithm and I don't succeed to find what could be wrong... could you help a newbie like me.