This segfault does not always happen. It did not on a 61x61 run or a 121x121 run. But on this run
```
mpiexec -n 4 pisms -eisII A -Mx 181 -My 181 -Mz 181 -y 200000 -skip \
-skip_max 10 -o eisIIA…
_Minor_ but improvable. Consider
```
...
* Initializing the surface model reading temperature at the top of the ice
and ice surface mass flux from a file...
- Reading boundary conditions from '…