I got a program which does the following sequence of operations --

SSL_shutdown(ssl)
SSL_free (ssl);
SSL_CTX_free ( ctx );
close(socket)

Where 'socket' is the underlying non-blocking socket the ssl connection is established over. bio is also set to non-blocking.

Sometimes, the program crashes when doing an SSL_CTX_free; before the crash, ctx is an invalid pointer, that's why I can get a valid value from SSL_CTX_get_max_cert_list (ctx), so it's not a double free problem.

I tried removing SSL_shutdown(ssl) with no improvements.
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