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The test was modifying a pointer to a struct that had been passed to another goroutine. Instead create a new struct to modify. ``` WARNING: DATA RACE Write at 0x00c01407c3c0 by goroutine 832: github.com/hashicorp/consul/agent.TestServiceManager_PersistService_API() /home/daniel/pers/code/consul/agent/service_manager_test.go:446 +0x1d86 testing.tRunner() /usr/lib/go/src/testing/testing.go:1193 +0x202 Previous read at 0x00c01407c3c0 by goroutine 938: reflect.typedmemmove() /usr/lib/go/src/runtime/mbarrier.go:177 +0x0 reflect.Value.Set() /usr/lib/go/src/reflect/value.go:1569 +0x13b github.com/mitchellh/copystructure.(*walker).Primitive() /home/daniel/go/pkg/mod/github.com/mitchellh/copystructure@v1.0.0/copystructure.go:289 +0x190 github.com/mitchellh/reflectwalk.walkPrimitive() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:252 +0x31b github.com/mitchellh/reflectwalk.walk() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:179 +0x24d github.com/mitchellh/reflectwalk.walkStruct() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:386 +0x4ec github.com/mitchellh/reflectwalk.walk() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:188 +0x656 github.com/mitchellh/reflectwalk.walkStruct() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:386 +0x4ec github.com/mitchellh/reflectwalk.walk() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:188 +0x656 github.com/mitchellh/reflectwalk.Walk() /home/daniel/go/pkg/mod/github.com/mitchellh/reflectwalk@v1.0.1/reflectwalk.go:92 +0x164 github.com/mitchellh/copystructure.Config.Copy() /home/daniel/go/pkg/mod/github.com/mitchellh/copystructure@v1.0.0/copystructure.go:69 +0xe7 github.com/mitchellh/copystructure.Copy() /home/daniel/go/pkg/mod/github.com/mitchellh/copystructure@v1.0.0/copystructure.go:13 +0x84 github.com/hashicorp/consul/agent.mergeServiceConfig() /home/daniel/pers/code/consul/agent/service_manager.go:362 +0x56 github.com/hashicorp/consul/agent.(*serviceConfigWatch).handleUpdate() /home/daniel/pers/code/consul/agent/service_manager.go:279 +0x250 github.com/hashicorp/consul/agent.(*serviceConfigWatch).runWatch() /home/daniel/pers/code/consul/agent/service_manager.go:246 +0x2d4 Goroutine 832 (running) created at: testing.(*T).Run() /usr/lib/go/src/testing/testing.go:1238 +0x5d7 testing.runTests.func1() /usr/lib/go/src/testing/testing.go:1511 +0xa6 testing.tRunner() /usr/lib/go/src/testing/testing.go:1193 +0x202 testing.runTests() /usr/lib/go/src/testing/testing.go:1509 +0x612 testing.(*M).Run() /usr/lib/go/src/testing/testing.go:1417 +0x3b3 main.main() _testmain.go:1181 +0x236 Goroutine 938 (running) created at: github.com/hashicorp/consul/agent.(*serviceConfigWatch).start() /home/daniel/pers/code/consul/agent/service_manager.go:223 +0x4e4 github.com/hashicorp/consul/agent.(*ServiceManager).AddService() /home/daniel/pers/code/consul/agent/service_manager.go:98 +0x344 github.com/hashicorp/consul/agent.(*Agent).addServiceLocked() /home/daniel/pers/code/consul/agent/agent.go:1942 +0x2e4 github.com/hashicorp/consul/agent.(*Agent).AddService() /home/daniel/pers/code/consul/agent/agent.go:1929 +0x337 github.com/hashicorp/consul/agent.TestServiceManager_PersistService_API() /home/daniel/pers/code/consul/agent/service_manager_test.go:400 +0x17c4 testing.tRunner() /usr/lib/go/src/testing/testing.go:1193 +0x202 ```