Hi, I just cloned the petsc-dev branch for the first time and built it with GCC with both release and debug options and the tests during make test worked fine. I then built it with Intel with release options and the tests worked. Then I compiled with debug options and one of the tests generates an error: Possible error running Fortran example src/snes/examples/tutorials/ex5f with 1 MPI process See http://www.mcs.anl.gov/petsc/documentation/faq.html forrtl: severe (408): fort: (2): Subscript #1 of the array LX_V has value 15092 which is greater than the upper bound of 1 Image PC Routine Line Source libirc.so 00007F4245C589AA Unknown Unknown Unknown libirc.so 00007F4245C574A6 Unknown Unknown Unknown libifcore.so.5 00007F4240A5B6FC Unknown Unknown Unknown libifcore.so.5 00007F42409CEDA2 Unknown Unknown Unknown libifcore.so.5 00007F42409CF323 Unknown Unknown Unknown ex5f 0000000000403F58 forminitialguess_ 294 ex5f.F ex5f 0000000000403719 MAIN__ 224 ex5f.F ex5f 00000000004028AC Unknown Unknown Unknown libc.so.6 00007F42401AB23D Unknown Unknown Unknown ex5f 00000000004027A9 Unknown Unknown Unknown I am using: Intel(R) Fortran Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 12.1.1.256 Build 20111011 Copyright (C) 1985-2011 Intel Corporation. All rights reserved. and petsc was configured with: ./configure PETSC_ARCH=linux-intel-debug --prefix=/opt/petsc/intel/2011.sp1.1/debug --with-make-np=12 --with-clanguage=C++ --with-c-support=1--with-fortran-kernels=1 --with-shared-libraries=1--download-scalapack=yes --download-parmetis=yes --download-metis=yes --with-imagemagick=1 --download-sundials=yes --download-mpi4py=yes --download-petsc4py=yes --download-boost=yes --with-hdf5=1 --with-hdf5-dir=$HDF5_DIR --with-imagemagick=0 --with-shared-libraries --with-debugging=no COPTFLAGS='-g -C -traceback -fpe0 -check noarg_temp_created -fp-stack-check -check uninit' FOPTFLAGS='-g -C -traceback -fpe0 -check noarg_temp_created -fp-stack-check -check uninit' I am going to try looking for the problem, but since this is the first 10 minutes I've looked at the code, it will probably take me a lot longer than somebody else to find the problem. Let me know if there's anything I can do to help track down the problem. Thanks, Tim