certbot segfaulting when invoked for renewing certificates

[Gabriele Svelto <gabriele.svelto%gmail.com@localhost>]

 Hello all,
I've got certbot installed (from pkgsrc's trunk, so version 0.9.3) and
I'm using it automatically to renew certificates on my machine. However
since the last couple of days it's consistently segfaulting when invoked
with the 'renew' command.

The bottom of the stack trace I get for the segfault looks like this:

#0  0x00007f7ff7e13fc0 in ?? ()
#1  0x00007f7ff0f4dd09 in internal_verify () from
/usr/pkg/lib/libcrypto.so.1.0.0
#2  0x00007f7ff0f4fb9e in X509_verify_cert () from
/usr/pkg/lib/libcrypto.so.1.0.0
#3  0x00007f7ff1444778 in ssl_verify_cert_chain () from
/usr/pkg/lib/libssl.so.1.0.0
#4  0x00007f7ff14203fc in ssl3_get_server_certificate () from
/usr/pkg/lib/libssl.so.1.0.0
#5  0x00007f7ff142505e in ssl3_connect () from /usr/pkg/lib/libssl.so.1.0.0
#6  0x00007f7ff142e61e in ssl23_connect () from /usr/pkg/lib/libssl.so.1.0.0
#7  0x00007f7feee59679 in _cffi_f_SSL_do_handshake () from
/usr/pkg/lib/python2.7/site-packages/cryptography/hazmat/bindings/_openssl.so
#8  0x00007f7ff78e04e4 in PyEval_EvalFrameEx () from
/usr/pkg/lib/libpython2.7.so.1.0

I'm using pkgsrc's openssl BTW. I've found another thread about this but
no solution. Does anybody know what's going on? This has been working
properly for months so I'm not sure what changed.

 Gabriele