I am trying to run a Fortran program that exercises some of my computational kernels. The program does not use MPI, just OpenMP. I have compiled it for a small case and that runs fine and gives the correct results. However when I recompile it for a realistic cases (the same source is used, only a bunch of parameter statements are different), it segfaults at line 13 of the main program: [knl00 tests] ../mc/x.testwf.12c-11_states-pn c12_11states-pn.in forrtl: severe (174): SIGSEGV, segmentation fault occurred Image PC Routine Line Source libintlc.so.5 00007F569D060C05 Unknown Unknown Unknown libintlc.so.5 00007F569D05E827 Unknown Unknown Unknown libifcoremt.so.5 00007F569DEE1962 Unknown Unknown Unknown libifcoremt.so.5 00007F569DEE17B6 Unknown Unknown Unknown libifcoremt.so.5 00007F569DE36CAD Unknown Unknown Unknown libifcoremt.so.5 00007F569DE48FAD Unknown Unknown Unknown libpthread.so.0 00007F569F2D7100 Unknown Unknown Unknown x.testwf.12c-11_s 00000000004030F0 MAIN__ 13 testwf.f x.testwf.12c-11_s 0000000000402C0E Unknown Unknown Unknown libc.so.6 00007F569CAA3B15 Unknown Unknown Unknown x.testwf.12c-11_s 0000000000402B19 Unknown Unknown Unknown Aborted (core dumped) [knl00 tests] Line 13 is the very beginning of declarations, not an executable statement. It is the first non-comment line and is: use random2 random2 is a module that defines some subroutines. It is not changed by the parameter statements that are different for the working and failing cases. Here are the working and failing executable sizes: text data bss dec hex filename 2459352 124772 24979752 27563876 1a49764 x.testwf.4he-pn 2192689 92004 623277384 625562077 254951dd x.testwf.12c-11_states-pn Here is how the main program is compiled and module linked: ifort -Imods.libgen -FR -g -O0 -qopenmp -lpthread -qopenmp-report -r8 -WB -traceback -fpe3 -I../common/ -I../mc/ -fpp -DSPIN_SUF= -DPARAMNUC=nclude/paramnuc.12c-11_states-pn -DM0_DIV=1 -DDOCASE=0 -DPARAMCASE=nclude/paramcase.12c-11_states-pn -c -g testwf.f ifort -g -mcmodel=medium -traceback -fpe3 -qopenmp -lpthread -qopenmp-report -o x.testwf.12c-11_states-pn testwf.o do_adlb_no.o dmem_fake.o adlb_fake.o \ ../common/wall_second-nompi.o ../common/stopnompi.o ../common/mpi_wtime_fake.o -L . -l12c-11_states-pn -lgen -l12c-11_states-pn -L ../common/ -lcomgen enable_abort_fake.o -lsvml [knl00 mc] which ifort /soft/compilers/intel/bin/ifort This is in ~b21541/gfmc/mc . This test case runs fine on blues. Any suggestions will be gratefully received. Steve -- Steven C. Pieper, Senior Physicist SO: [email protected] Argonne National Laboratory, Physics Division, Bldg. 203, Argonne, IL 60439 Phone: 630-252-4232 Fax -6008 Secretary, Debra Beres, -4100