Tor should complain if the user has configured a too-short CBT
The reporter of legacy/trac#5363 (moved) set the following torrc lines, and Tor got flaky:
LearnCircuitBuildTimeout 0 CircuitBuildTimeout 5
Perhaps Tor should warn the user if he/she/it has specified a non-adaptive circuit-build timeout and Tor is failing to build too many circuits.
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