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After upgrading Tor from v0.2.7.1-alpha to v0.2.7.2-alpha I get a new warning message:

Jul 30 16:47:24.820 [notice] Tor 0.2.7.2-alpha (git-36c0ae6f7834af16) opening log file.
Jul 30 16:47:24.821 [notice] {ACCT} Configured hibernation.  This interval began at 2015-07-30 07:00:00; the scheduled wake-up time was 2015-07-30 07:00:00; we expect to exhaust our quota for this interval around 2015-07-31 07:00:00; the next interval begins at 2015-07-31 07:00:00 (all times local)
Jul 30 16:47:25.033 [warn] {CONFIG} ConnLimit must be at least 32. Failing.
Jul 30 16:48:00.749 [notice] {CONTROL} New control connection opened from 127.0.1.5.
Jul 30 16:48:00.808 [warn] {CONFIG} ConnLimit must be at least 32. Failing.

With the attached patch the warning is:

[warn] {CONFIG} ConnLimit must be at least 32 but is 0. Failing.

The torrcs do not contain a ConnLimit directive and adding one doesn't seem to make a difference.

Sending SIGHUP or (re-)connecting to the ControlPort results in a new warning.

So far I'm reproducible getting the warning on a relay and on a hidden service but not on a pure client.