[MITgcm-support] segmentation fault

[Andreas Klocker]

Hi guys,

I've taken a working 1/24 degree nested simulation (of Drake Passage)
with 42 vertical layers and tried to increase the vertical layers to 150
(without changing anything else apart from obviously my boundary files
for OBCS and recompiling with 150 vertical layers). Suddenly I get the
following error message:

forrtl: severe (174): SIGSEGV, segmentation fault occurred
Image              PC                Routine Line        Source
libirc.so          00002BA1704BC2C9  Unknown Unknown  Unknown
libirc.so          00002BA1704BAB9E  Unknown Unknown  Unknown
libifcore.so.5     00002BA1722B5F3F  Unknown Unknown  Unknown
libifcore.so.5     00002BA17221DD7F  Unknown Unknown  Unknown
libifcore.so.5     00002BA17222EF43  Unknown Unknown  Unknown
libpthread.so.0    00002BA1733B27E0  Unknown Unknown  Unknown
mitgcmuv_drake24_  00000000004E61BC  mom_calc_visc_ 3345  mom_calc_visc.f
mitgcmuv_drake24_  0000000000415127  mom_vecinv_ 3453  mom_vecinv.f
mitgcmuv_drake24_  0000000000601C33  dynamics_ 3426  dynamics.f
mitgcmuv_drake24_  0000000000613C2B  forward_step_ 2229  forward_step.f
mitgcmuv_drake24_  000000000064581E  main_do_loop_ 1886  main_do_loop.f
mitgcmuv_drake24_  000000000065E500  the_main_loop_ 1904  the_main_loop.f
mitgcmuv_drake24_  000000000065E6AE  the_model_main_ 2394  the_model_main.f
mitgcmuv_drake24_  00000000005C6439  MAIN__ 3870  main.f
mitgcmuv_drake24_  0000000000406776  Unknown Unknown  Unknown
libc.so.6          00002BA1737E2D1D  Unknown Unknown  Unknown
mitgcmuv_drake24_  0000000000406669  Unknown Unknown  Unknown

First this error pointed to a line in mom_calc_visc.f on which
calculations regarding the Leith viscosity are done. As a test I then
used a Smagorinsky viscosity instead and now it crashes with the same
error, but pointing to a line where Smagorinsky calculations are done. I
assume I must be chasing a way more fundamental problem than one related
to these two viscosity choices...but I'm not sure what this might be....

Has anyone got any idea of what could be going wrong here?

Thanks in advance!

Andreas



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