Segmentation fault when built with MPI and run on 1 process in global mode #11
Description
When UMWM is compiled with -DMPI, isglobal = .true. in namelists/main.nml, and the program is run on 1 process, it triggers a segmentation fault, e.g.:
umwm: nmlread: warning: pm should be divisible by 8 for optimal propagation properties
umwm: grid: dx min/max/mean [m]: 970.33 111193.26 70782.45
umwm: grid: dy min/max/mean [m]: 111193.70 111195.98 111134.87
umwm: grid: area min/max/mean [m^2]: 107894896.00 12364143616.00 7870612992.00
umwm: masks: total number of grid points: 64800
umwm: masks: number of land points: 20149, 31.1%
umwm: masks: number of sea points: 44651, 68.9%
umwm: masks: shallowest point: 10.000 meters
umwm: masks: deepest point: 8330.680 meters
umwm: partition: tiling summary:
+---------+------------+----------------+----------------+
| nproc | ilen | istart | iend |
+---------+------------+----------------+----------------+
| 0 | 44651 | 1 | 44651 |
+---------+------------+----------------+----------------+
umwm: remap: tiling with halo summary:
+---------+------------+----------------+----------------+
| nproc | iilen | iistart | iiend |
+---------+------------+----------------+----------------+
| 0 | 497 | -164 | 332 |
+---------+------------+----------------+----------------+
umwm: output_grid: grid definition written in output/umwmout.grid
umwm: dispersion: solving for dispersion relationship;
forrtl: severe (408): fort: (2): Subscript #2 of the array CP0 has value 333 which is greater than the upper bound of 332
Image PC Routine Line Source
umwm.mpi 0000000000A9BC80 Unknown Unknown Unknown
umwm.mpi 000000000042897C umwm_init_mp_disp 1445 umwm_init.F90
umwm.mpi 0000000000439D7C umwm_init_mp_init 1336 umwm_init.F90
umwm.mpi 00000000004DB0AD umwm_top_mp_umwm_ 26 umwm_top.F90
umwm.mpi 000000000040C1C8 MAIN__ 7 umwm.F90
umwm.mpi 000000000040C0EE Unknown Unknown Unknown
libc-2.22.so 00002AAAAD567725 __libc_start_main Unknown Unknown
umwm.mpi 000000000040BFE9 Unknown Unknown Unknown
This occurs because iiend is not set to a correct value at initialization. iiend must be greater than iend when isglobal is true.
Running on 2 or more processes is fine. Running on 1 process, but compiled without -DMPI, i.e. with CPPFLAGS="", is fine as well.
Reported by @adarmenov.