goroutine 280 [running]:
<http://github.com/pulumi/pulumi/pkg/util/contract.failfast(...)|github.com/pulumi/pulumi/pkg/util/contract.failfast(...)>
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/util/contract/failfast.go:23
<http://github.com/pulumi/pulumi/pkg/util/contract.Assert(...)|github.com/pulumi/pulumi/pkg/util/contract.Assert(...)>
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/util/contract/assert.go:26
<http://github.com/pulumi/pulumi/pkg/resource/plugin.(*provider).Diff(0xc0036c9f20|github.com/pulumi/pulumi/pkg/resource/plugin.(*provider).Diff(0xc0036c9f20>, 0xc006027e00, 0xea, 0x0, 0x0, 0xc002a1ca50, 0xc001ed8d20, 0x203001, 0x0, 0x0, ...)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/plugin/provider_plugin.go:504 +0x15ba
<http://github.com/pulumi/pulumi/pkg/resource/deploy.diffResource(0xc006027e00|github.com/pulumi/pulumi/pkg/resource/deploy.diffResource(0xc006027e00>, 0xea, 0x0, 0x0, 0xc002a1c7b0, 0xc002a1ca50, 0xc001ed8d20, 0x19d5340, 0xc0036c9f20, 0xc004632501, ...)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/step_generator.go:1049 +0x118
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).diff(0xc0057c7440|github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).diff(0xc0057c7440>, 0xc006027e00, 0xea, 0xc0029b6b00, 0xc00330e900, 0xc002a1c7b0, 0xc002a1ca50, 0xc001ed8d20, 0x19d5340, 0xc0036c9f20, ...)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/step_generator.go:1037 +0x30d
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).generateStepsFromDiff(0xc0057c7440|github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).generateStepsFromDiff(0xc0057c7440>, 0x7f6ab8111fc0, 0xc00486efa0, 0xc006027e00, 0xea, 0xc0029b6b00, 0xc00330e900, 0xc002a1c7b0, 0xc002a1ca50, 0xc001ed8d20, ...)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/step_generator.go:499 +0xf6
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).generateSteps(0xc0057c7440|github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).generateSteps(0xc0057c7440>, 0x7f6ab8111fc0, 0xc00486efa0, 0xc00119d200, 0x3, 0xc001401aa0, 0x1, 0xc00119d200)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/step_generator.go:432 +0xead
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).GenerateSteps(0xc0057c7440|github.com/pulumi/pulumi/pkg/resource/deploy.(*stepGenerator).GenerateSteps(0xc0057c7440>, 0x7f6ab8111fc0, 0xc00486efa0, 0x7f6ab8111fc0, 0xc00486efa0, 0x1, 0xc001401ac0, 0x45d9c0)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/step_generator.go:155 +0x5a
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*planExecutor).handleSingleEvent(0xc00577b200|github.com/pulumi/pulumi/pkg/resource/deploy.(*planExecutor).handleSingleEvent(0xc00577b200>, 0x1988bc0, 0xc00486efa0, 0x0, 0x1)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/plan_executor.go:361 +0x138
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*planExecutor).Execute.func3(0xc005879440|github.com/pulumi/pulumi/pkg/resource/deploy.(*planExecutor).Execute.func3(0xc005879440>, 0xc00577b200, 0xc005726bf0, 0x19b4280, 0xc001e25c80, 0x0, 0x0, 0x19b4340, 0xc00570a030, 0x0, ...)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/plan_executor.go:235 +0x210
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*planExecutor).Execute(0xc00577b200|github.com/pulumi/pulumi/pkg/resource/deploy.(*planExecutor).Execute(0xc00577b200>, 0x19b4340, 0xc00570a030, 0x19b4680, 0xc0057c70e0, 0x7fffffff, 0x0, 0x0, 0x0, 0x0, ...)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/plan_executor.go:251 +0x7da
<http://github.com/pulumi/pulumi/pkg/resource/deploy.(*Plan).Execute(...)|github.com/pulumi/pulumi/pkg/resource/deploy.(*Plan).Execute(...)>
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/resource/deploy/plan.go:335
<http://github.com/pulumi/pulumi/pkg/engine.(*planResult).Walk.func1(0x19b4680|github.com/pulumi/pulumi/pkg/engine.(*planResult).Walk.func1(0x19b4680>, 0xc0057c70e0, 0xc0057c6ea0, 0x19b4340, 0xc00570a030, 0xc00570a001, 0xc005726b20, 0xc005878ba0)
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/engine/plan.go:192 +0x24a
created by <http://github.com/pulumi/pulumi/pkg/engine.(*planResult).Walk|github.com/pulumi/pulumi/pkg/engine.(*planResult).Walk>
	/home/travis/gopath/src/github.com/pulumi/pulumi/pkg/engine/plan.go:178 +0x177