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Test Case UdpServerTest.supportsUdpMulticast fails sporadically

See original GitHub issue

When running ./gradlew build the test case UdpServerTest.supportsUdpMulticast sporadically (1 out of 3 builds) fails

reactor.netty.ChannelBindException: Failed to bind on [0:0:0:0:0:0:0:1%0:59042]
	Suppressed: java.lang.Exception: #block terminated with an error
		at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:139)
		at reactor.core.publisher.Mono.block(Mono.java:1727)
		at reactor.netty.udp.UdpServer.bindNow(UdpServer.java:120)
		at reactor.netty.udp.UdpServerTests.portBindingException(UdpServerTests.java:266)
		at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
		at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
		at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.base/java.lang.reflect.Method.invoke(Method.java:566)

UdpServerTests.zip

Expected Behavior

Build runs always without test errors

Actual Behavior

Build fails sometimes with test errors

Steps to Reproduce

Run build

Possible Solution

Your Environment

Reactor version(s) used: reactor-netty 1.0.7 JVM version : OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.7+10, mixed mode) OS and version: Linux 5.12.10-arch1-1 #1 SMP PREEMPT Thu, 10 Jun 2021 16:34:50 +0000 x86_64 GNU/Linux