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Sep 28 16:23:29.567 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:22:28, but circuit launched at 2010-09-28 16:22:28. It's now 2010-09-28 16:23:29.
Sep 28 16:25:31.815 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:24:30, but circuit launched at 2010-09-28 16:24:30. It's now 2010-09-28 16:25:31.
Sep 28 16:28:34.211 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:27:33, but circuit launched at 2010-09-28 16:27:33. It's now 2010-09-28 16:28:34.
Sep 28 16:35:00.010 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:33:59, but circuit launched at 2010-09-28 16:33:59. It's now 2010-09-28 16:35:00.
Sep 28 16:50:15.030 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:49:14, but circuit launched at 2010-09-28 16:49:14. It's now 2010-09-28 16:50:15.

If I look closer at them, it seems we're not actually completing a hop:

Sep 28 16:25:31.815 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:24:30, but circuit launched at 2010-09-28 16:24:30. It's now 2010-09-28 16:25:31.
Sep 28 16:25:31.816 [debug] circuit_build_times_add_time(): Adding circuit build time 2147483646
Sep 28 16:25:31.816 [info] circuit_expire_building(): Abandoning circ 128.31.0.34:9009:56334 (state 0:doing handshakes, purpose 13)
Sep 28 16:25:31.816 [info] exit circ (length 3, exit Amunet11): $4C17FB532E20B2A8AC199441ECD2B0177B39E4B1(open) Pandora14(waiting for keys) Amunet11(closed)
Sep 28 16:25:31.816 [debug] connection_or_send_destroy(): Sending destroy (circID 56334).

or

Sep 28 16:50:15.030 [warn] circuit_build_times_network_close(): Bug: Circuit somehow completed a hop while the network was not live. Network was last live at 2010-09-28 16:49:14, but circuit launched at 2010-09-28 16:49:14. It's now 2010-09-28 16:50:15.
Sep 28 16:50:15.031 [debug] circuit_build_times_add_time(): Adding circuit build time 2147483646
Sep 28 16:50:15.031 [info] circuit_expire_building(): Abandoning circ 128.31.0.34:9009:56361 (state 0:doing handshakes, purpose 13)
Sep 28 16:50:15.031 [info] exit circ (length 3, exit morphium2): $4C17FB532E20B2A8AC199441ECD2B0177B39E4B1(open) $F08F537D245A65D9C242359983718A19650A25F7(open) morphium2(waiting for keys)
Sep 28 16:50:15.031 [debug] connection_or_send_destroy(): Sending destroy (circID 56361).

I'm using a bridge.

Also, it's a nice coincidence that "circuit launched at x" and "network was last live at y" are always x=y.