Bug: Duplicate call to circuit_mark_for_close

I noticed an extreme increase of memory usage (increase by ~500MB compared to normal), after looking into the logs I stumbled upon:

circuit_mark_for_close_(): Bug: Duplicate call to circuit_mark_for_close at ../src/or/onion.c:182 (first at ../src/or/command.c:559) (on Tor 0.2.8.6 )

(6 times within one second)

also in the logs 10 seconds before the log entries above:

Removed 109202016 bytes by killing 2 circuits; 5252 circuits remain alive. Also killed 0 non-linked directory connections.

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