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counts. Brandon reported this assertion failure when running http-enum: nmap: nsock_core.c:199: socket_count_write_dec: Assertion `(iod->writesd_count) > 0' failed. The problem was that handle_write_result always assumed that if a call to SSL_write failed with SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE, that it must have been invoked because the socket was writable (and hence the write count should be decremented). Because of how non-blocking sockets work in OpenSSL, it's possible that we called handle_write_result because a socket because *readable* and thus we should decrement the read count, not the write count.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).