A typo in the return value from `tor_init` means that if `crypto_early_init` fails, `tor_main` can continue running, rather than returning with an error value. This bug was introduced in commit `d3fb846d8c98` possibly related to feature legacy/trac#4900, first released in 0.2.5.2-alpha. Given it's a very simple fix, where tor continues to run half-initialised, we might want to backport it. I'll post a branch very soon.