But try updating to latest versions and if you can reproduce the issue, then provide reproduction steps in issue in GitHub. Segfault should never happen under no cindition

At the moment, the most common condition is that the version of magic is too old; I added a "require" line to the techfile to force magic to exit if a tech file contains syntax that magic won't recognize, but versions of magic prior to that will tend to crash when seeing unknown entries in the tech file.