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The README states

For example, to compute Equihash using N=120 and k=5 using this projects Makefile as seed, consuming at least 32 MB of RAM

$ ./equihash -n 120 -k 5 -s Makefile

However, actually running this on the current master results in the error message below on Linux.

$ ./equihash -n 120 -k 5 -s Makefile                                                                                                                                                                         git:master
Error: must provide input file for non-benchmarking modes

Since line 211 of main.c sets status to NULL, line 219 and then passes status as the first parameter of fprintf, if the conditional block between this block is not executed, fprintf tries to dereference it, which leads to segmentation fault on Linux. See GDB/GEF screenshot below. The command I run was ./equihash solve -v -n 40 -k 4 -f Makefile -s /tmp/s which I took directly from README.md. To produce the screenshot below, I only removed -O3 from the Makefile but the crash happens regardless whether optimization is enabled or not – it just produces more readable backtraces.