With "master" branch commit 8f7e7147832b239ef17e8b42666067c2c7fb855b (June 29, 2023) and earlier:
make clean stepwat_test
./stepwat_test
Running main() from sw_src/googletest/googletest/src/gtest_main.cc
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from ST_Mortality_test
[ RUN ] ST_Mortality_test.Simulate_prescribed_fire_when_killfreq_startyr_is_0
Segmentation fault: 11
With "master" branch commit 8f7e7147832b239ef17e8b42666067c2c7fb855b (June 29, 2023) and earlier: