scheduler_release_channel: Non-fatal assertion

Got this at a stable hardened Gentoo Linux exit :

Dec 02 18:20:17.000 [warn] Tried to establish rendezvous on non-OR circuit with purpose Acting as rendevous (pending)

... <repeating>

Dec 03 01:03:59.000 [warn] Tried to establish rendezvous on non-OR circuit with purpose Acting as rendevous (pending)
Dec 03 01:04:10.000 [warn] Tried to establish rendezvous on non-OR circuit with purpose Acting as rendevous (pending)
Dec 03 01:07:47.000 [warn] tor_bug_occurred_(): Bug: src/or/scheduler.c:631: scheduler_release_channel: Non-fatal assertion !(smartlist_pos(channels_pending, chan) == -1) failed. (on Tor 0.3.2.6-alpha 87012d076ef58bb9)

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