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Single-hop (or unknown relay) attempts in 0.2.3



While tracking down #2205, I bumped up the severity level of

log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
             "Attempt by %s to open a stream %s. Closing.",
             safe_str(or_circ->p_conn->_base.address),
             or_circ->is_first_hop ? "on first hop of circuit" :
                                     "from unknown relay");

in connection_edge.c to LOG_NOTICE.  I've applied the patch
https://trac.torproject.org/projects/tor/attachment/ticket/2205/idea_raw_for_2205.diff
but every 3-6 hours, I see a group of entries like this in my log:

Dec 02 05:08:17.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:18.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:18.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:18.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:19.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:19.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:20.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:21.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:21.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:22.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.
Dec 02 05:08:22.000 [notice] Attempt by [scrubbed] to open a stream from
unknown relay. Closing.

Any idea what this might be?

   - Ian