grpc sometimes failed to bind ipv6 localhost inside macOS sanbox-exec

[meteorcloudy]

See context in bazelbuild/bazel#20743

TL;DR: when running a grpc server inside macOS sandbox with internet access blocked, grpc sometimes failed to bind ipv6 localhost with the following error:

ci@bk-macstudio-9 sandbox_grpc_bug % /usr/bin/sandbox-exec -f no-internet.sb /Users/ci/workdir-pcloudy/bazel/bazel-bin/src/test/shell/bazel/bind
Exception in thread "main" java.io.IOException: Failed to bind to address /0:0:0:0:0:0:0:1:0
	at io.grpc.netty.NettyServer.start(NettyServer.java:328)
	at io.grpc.internal.ServerImpl.start(ServerImpl.java:185)
	at io.grpc.internal.ServerImpl.start(ServerImpl.java:94)
	at SocketBindingExample.main(SocketBindingExample.java:23)
Caused by: java.net.SocketException: Operation not permitted
	at java.base/sun.nio.ch.Net.bind0(Native Method)
	at java.base/sun.nio.ch.Net.bind(Net.java:459)
	at java.base/sun.nio.ch.Net.bind(Net.java:448)
	at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227)
	at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:141)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:562)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1334)
	at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:600)
	at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:579)
	at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:973)
	at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:260)
	at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:356)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:829)

What version of gRPC-Java are you using?

At least all versions from 1.49.x to 1.56.x

What is your environment?

macOS

What did you expect to see?

grpc successfully binding to ipv6 localhost inside macOS sandbox-exec

What did you see instead?

grpc sometimes failed to bind to ipv6 localhost inside macOS sandbox-exec

Steps to reproduce the bug

This issue is only reproducible on some of the Bazel CI mac machines, we are still not sure what specific environment triggered it. bazelbuild/bazel#20743 (comment) is the minimal reproducible case.

[sergiitk]

This seems be caused by bazel, and got resolved in bazelbuild/bazel#20755.

EDIT: fixed the PR link.

[ejona86]

Seems this was never a gRPC issue and has been dealt with in bazel. Closing.

[sergiitk]

For posterity, after a reproduction attempt, I also responded here : bazelbuild/bazel#20743 (comment).