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The proc.Stop just sends the SIGTERM to etcd server. The etcd server needs time to teardown. If we don't wait for it, the etcd server will hold the port and then next test case, like TestGrpcProxyAutoSync, will fail to listen on the port 20000. ```bash file_/__w/etcd/etcd/tests/fixtures/server.crt_--peer-key-file_/__w/etcd/etcd/tests/fixtures/server.key.insecure_--cert-file_/__w/etcd/etcd/tests/fixtures/server2.crt_--key-file_/__w/etcd/etcd/tests/fixtures/server2.key.insecure_--tls-min-version_TLS1.2_--tls-max-version_TLS1.3) (32856): {"level":"info","ts":"2023-10-13T06:12:32.718845Z","caller":"embed/etcd.go:394","msg":"closing etcd server","name":"e1","data-dir":"/tmp/TestEtcdTLSVersion284993522/001","advertise-peer-urls":["https://127.0.0.1:20000"],"advertise-client-urls":["https://0.0.0.0:0"]} 2023-10-13T06:12:32.7399709Z --- PASS: TestEtcdTLSVersion (1.03s) 2023-10-13T06:12:32.7400181Z === RUN TestGrpcProxyAutoSync 2023-10-13T06:12:32.7401203Z logger.go:130: 2023-10-13T06:12:32.719Z INFO starting server... {"name": "TestGrpcProxyAutoSync-test-0"} 2023-10-13T06:12:32.7408306Z logger.go:130: 2023-10-13T06:12:32.719Z INFO spawning process {"args": ["/__w/etcd/etcd/bin/etcd", "--name=TestGrpcProxyAutoSync-test-0", "--listen-client-urls=http://localhost:20000", "--advertise-client-urls=http://localhost:20000", "--listen-peer-urls=http://localhost:20001", "--initial-advertise-peer-urls=http://localhost:20001", "--initial-cluster-token=new", "--data-dir", "/tmp/TestGrpcProxyAutoSync1139610722/001", "--snapshot-count=10000", "--initial-cluster-token=new", "--initial-cluster=TestGrpcProxyAutoSync-test-0=http://localhost:20001", "--initial-cluster-state=new"], "working-dir": "/__w/etcd/etcd/tests/e2e", "name": "TestGrpcProxyAutoSync-test-0", "environment-variables": ["ETCD_VERIFY=all", "EXPECT_DEBUG=true", "PATH=/__t/go/1.21.3/x64/bin:/go/bin:/__t/go/1.21.3/x64/bin:/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "ETCD_UNSUPPORTED_ARCH=amd64"]} ... 2023-10-13T06:12:32.7559855Z /__w/etcd/etcd/bin/etcd (TestGrpcProxyAutoSync-test-0) (32863): {"level":"fatal","ts":"2023-10-13T06:12:32.735191Z","caller":"etcdmain/etcd.go:181","msg":"discovery failed","error":"listen tcp 127.0.0.1:20000: bind: address already in use","stacktrace":"go.etcd.io/etcd/server/v3/etcdmain.startEtcdOrProxyV2\n\tgo.etcd.io/etcd/server/v3/etcdmain/etcd.go:181\ngo.etcd.io/etcd/server/v3/etcdmain.Main\n\tgo.etcd.io/etcd/server/v3/etcdmain/main.go:40\nmain.main\n\tgo.etcd.io/etcd/server/v3/main.go:31\nruntime.main\n\truntime/proc.go:267"} ``` Signed-off-by: Wei Fu <fuweid89@gmail.com>
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