Fathom

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The library seems to have problems when multiple threads call tb_probe_root (memory corruption). In my engine this is not done during a normal search, but there are some cases in which it is done (the parameter tuning utility for example can launch multiple threads, each of which does a root probe).

Yep, not thread safe. It says so in the header documentation:

 * - This function is NOT thread safe.  For engines this function should only
 *   be called once at the root per search.

The original code from this was based is also not thread safe at the root. I haven't looked into what is required to fix this.