circuit_receive_relay_cell(): Bug: relay crypt failed. Dropping connection.
I've hit this today on a machine running Debian Jessie and Tor 0.3.0.1-alpha-dev (git-1a45398ffa713ca3+5156f73) acting as an onion service client with a SocksPort open and used as well. Functionality appears not to be affected, everything continues to run normally.
Besides the incoming rendezvous traffic, this instance also sends outgoing traffic via the SocksPort but to .onion destinations only, so it's mostly rendezvous traffic.
Jan 23 15:31:44.000 [warn] circuit_receive_relay_cell(): Bug: relay crypt failed. Dropping connection. (on Tor 0.3.0.1-alpha-dev )
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