Ensure hostname is ascii #2
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ZachChuba
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Since approximately the LBv2 API (the current API) was introduced, gRPC
won't use a transport until it is ready. Long ago, transports could be
used before they were ready and these old tests were not waiting for the
negotiator to complete before starting. We need them to wait for the
handshake to complete to avoid a test-only data race in getAttributes()
noticed by TSAN.
Throwing away data frames in the Noop handshaker is necessary to act
like a normal handshaker; they don't allow data frames to pass until the
handshake is complete. Without the handling, it goes through invalid
code paths in NettyClientHandler where a terminated transport becomes
ready, and a similar data race.
```
Write of size 4 at 0x00008db31e2c by thread T37:
#0 io.grpc.netty.NettyClientHandler.handleProtocolNegotiationCompleted(Lio/grpc/Attributes;Lio/grpc/InternalChannelz$Security;)V NettyClientHandler.java:517
#1 io.grpc.netty.ProtocolNegotiators$GrpcNegotiationHandler.userEventTriggered(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V ProtocolNegotiators.java:937
#2 io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(Ljava/lang/Object;)V AbstractChannelHandlerContext.java:398
#3 io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(Lio/netty/channel/AbstractChannelHandlerContext;Ljava/lang/Object;)V AbstractChannelHandlerContext.java:376
grpc#4 io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(Ljava/lang/Object;)Lio/netty/channel/ChannelHandlerContext; AbstractChannelHandlerContext.java:368
grpc#5 io.grpc.netty.ProtocolNegotiators$ProtocolNegotiationHandler.fireProtocolNegotiationEvent(Lio/netty/channel/ChannelHandlerContext;)V ProtocolNegotiators.java:1107
grpc#6 io.grpc.netty.ProtocolNegotiators$WaitUntilActiveHandler.channelActive(Lio/netty/channel/ChannelHandlerContext;)V ProtocolNegotiators.java:1011
...
Previous read of size 4 at 0x00008db31e2c by thread T4 (mutexes: write M0, write M1, write M2, write M3):
#0 io.grpc.netty.NettyClientHandler.getAttributes()Lio/grpc/Attributes; NettyClientHandler.java:345
#1 io.grpc.netty.NettyClientTransport.getAttributes()Lio/grpc/Attributes; NettyClientTransport.java:387
#2 io.grpc.netty.NettyClientTransport.newStream(Lio/grpc/MethodDescriptor;Lio/grpc/Metadata;Lio/grpc/CallOptions;[Lio/grpc/ClientStreamTracer;)Lio/grpc/internal/ClientStream; NettyClientTransport.java:198
#3 io.grpc.netty.NettyClientTransportTest$Rpc.<init>(Lio/grpc/netty/NettyClientTransport;Lio/grpc/Metadata;)V NettyClientTransportTest.java:953
grpc#4 io.grpc.netty.NettyClientTransportTest.huffmanCodingShouldNotBePerformed()V NettyClientTransportTest.java:631
...
```
```
Read of size 4 at 0x00008f983a3c by thread T4 (mutexes: write M0, write M1):
#0 io.grpc.netty.NettyClientHandler.getAttributes()Lio/grpc/Attributes; NettyClientHandler.java:345
#1 io.grpc.netty.NettyClientTransport.getAttributes()Lio/grpc/Attributes; NettyClientTransport.java:387
#2 io.grpc.netty.NettyClientTransport.newStream(Lio/grpc/MethodDescriptor;Lio/grpc/Metadata;Lio/grpc/CallOptions;[Lio/grpc/ClientStreamTracer;)Lio/grpc/internal/ClientStream; NettyClientTransport.java:198
#3 io.grpc.netty.NettyClientTransportTest$Rpc.<init>(Lio/grpc/netty/NettyClientTransport;Lio/grpc/Metadata;)V NettyClientTransportTest.java:973
grpc#4 io.grpc.netty.NettyClientTransportTest$Rpc.<init>(Lio/grpc/netty/NettyClientTransport;)V NettyClientTransportTest.java:969
grpc#5 io.grpc.netty.NettyClientTransportTest.handlerExceptionDuringNegotiatonPropagatesToStatus()V NettyClientTransportTest.java:425
...
Previous write of size 4 at 0x00008f983a3c by thread T56:
#0 io.grpc.netty.NettyClientHandler$FrameListener.onSettingsRead(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http2/Http2Settings;)V NettyClientHandler.java:960
...
```
ZachChuba
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Sep 29, 2025
d65d394 increased the test speed of connect_then_mainServerDown_fallbackServerUp by using FakeClock. However, it introduced a data race because FakeClock is not thread-safe. This change injects a single thread for gRPC callbacks such that syncContext is run on a thread under the test's control. A simpler approach would be to expose syncContext from XdsClientImpl for testing. However, this test is in a different package and I wanted to avoid adding a public method. ``` Read of size 8 at 0x00008dec9d50 by thread T25: #0 io.grpc.internal.FakeClock$ScheduledExecutorImpl.schedule(Lio/grpc/internal/FakeClock$ScheduledTask;JLjava/util/concurrent/TimeUnit;)V FakeClock.java:140 #1 io.grpc.internal.FakeClock$ScheduledExecutorImpl.schedule(Ljava/lang/Runnable;JLjava/util/concurrent/TimeUnit;)Ljava/util/concurrent/ScheduledFuture; FakeClock.java:150 #2 io.grpc.SynchronizationContext.schedule(Ljava/lang/Runnable;JLjava/util/concurrent/TimeUnit;Ljava/util/concurrent/ScheduledExecutorService;)Lio/grpc/SynchronizationContext$ScheduledHandle; SynchronizationContext.java:153 #3 io.grpc.xds.client.ControlPlaneClient$AdsStream.handleRpcStreamClosed(Lio/grpc/Status;)V ControlPlaneClient.java:491 grpc#4 io.grpc.xds.client.ControlPlaneClient$AdsStream.lambda$onStatusReceived$0(Lio/grpc/Status;)V ControlPlaneClient.java:429 grpc#5 io.grpc.xds.client.ControlPlaneClient$AdsStream$$Lambda+0x00000001004a95d0.run()V ?? grpc#6 io.grpc.SynchronizationContext.drain()V SynchronizationContext.java:96 grpc#7 io.grpc.SynchronizationContext.execute(Ljava/lang/Runnable;)V SynchronizationContext.java:128 grpc#8 io.grpc.xds.client.ControlPlaneClient$AdsStream.onStatusReceived(Lio/grpc/Status;)V ControlPlaneClient.java:428 grpc#9 io.grpc.xds.GrpcXdsTransportFactory$EventHandlerToCallListenerAdapter.onClose(Lio/grpc/Status;Lio/grpc/Metadata;)V GrpcXdsTransportFactory.java:149 grpc#10 io.grpc.PartialForwardingClientCallListener.onClose(Lio/grpc/Status;Lio/grpc/Metadata;)V PartialForwardingClientCallListener.java:39 ... Previous write of size 8 at 0x00008dec9d50 by thread T4 (mutexes: write M0, write M1, write M2, write M3): #0 io.grpc.internal.FakeClock.forwardTime(JLjava/util/concurrent/TimeUnit;)I FakeClock.java:368 #1 io.grpc.xds.XdsClientFallbackTest.connect_then_mainServerDown_fallbackServerUp()V XdsClientFallbackTest.java:358 ... ```
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Implement fix to address potential security issue related to certificate validation in OkHttp
grpc-java is susceptible to CVE-2021-0341