id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
3836	SystemTestMixin.set_up_grid configures an introducer that tries to automatically select a main tub port	exarkun	exarkun	"`allmydata.test.common_system.SystemTestMixin._create_introducer` does not supply a configuration value for `tub.port` or `tub.location`.  Consequently, the introducer created by this function tries to pick a free TCP port on its own to use for the main tub.  Since this process is subject to race conditions, this sometimes fails.  Since `_create_introducer` is called by `set_up_nodes` and `set_up_nodes` is essentially the whole point of `SystemTestMixin`, all test cases that use `SystemTestMixin` are subject to this intermittent failure condition.

Instead, `_create_introducer` should supply a configuration that specifies a reliably available port for the main tub.
"	defect	closed	normal	undecided	unknown	n/a	fixed		exarkun