[🐛 Bug]: Grid 4 - Selenium hub crashes after a while

### What happened?

We've been using Selenium Grid 3 for years and we are running small tests frequently. We have a hub and 10 nodes on the same machine which we start and stop once a day. After upgrading to Grid 4 the tests started failing after about 40 minutes most probably due to memory problems. We have reproduced this constantly.
Could you please look into it?

![memory-usage](https://user-images.githubusercontent.com/55243864/139088728-4d9368e1-3a5c-47db-9fa7-218ed1168d9f.JPG)





### Command used to start Selenium Grid with Docker

```shell
version: '3'
services:
   seleniumhub:
       image: selenium/hub
       container_name: seleniumhub
       ports:
             - "4442:4442"
             - "4443:4443"
             - "4444:4444"
       volumes:
             - /dev/shm:/dev/shm
       environment:
             - GRID_TIMEOUT=340
             - GRID_BROWSER_TIMEOUT=320

   chrome:
       image: selenium/node-chrome
       shm_size: 512m
       depends_on:
             - seleniumhub
       volumes:
             - /tmp/automation:/home/seluser/Downloads
             - /dev/shm:/dev/shm

       environment:
        - SCREEN_WIDTH=1920
        - SCREEN_HEIGHT=1080
        - TZ=Europe/Bucharest
        - SE_EVENT_BUS_HOST=seleniumhub
        - SE_EVENT_BUS_PUBLISH_PORT=4442
        - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
        - SE_NODE_MAX_SESSIONS=1
```


### Relevant log output

```shell
09:25:13.536 INFO [GridModel.setAvailability] - Switching node 7bf35e99-1aef-4bc6-9b3d-54f3c1d41db9 (uri: http://172.23.0.10:5555) from DOWN to UP
09:25:15.410 INFO [GridModel.setAvailability] - Switching node 2d9bb0bc-6489-4f86-a0a5-7f4ea279e8b0 (uri: http://172.23.0.9:5555) from DOWN to UP
09:25:16.639 INFO [GridModel.setAvailability] - Switching node 9ac8adaf-1d78-4289-b65a-0d42117a1345 (uri: http://172.23.0.6:5555) from DOWN to UP
09:25:16.812 INFO [GridModel.setAvailability] - Switching node aa57fc51-923e-47d9-a545-132f22b39083 (uri: http://172.23.0.8:5555) from DOWN to UP
09:25:38.474 WARN [SeleniumSpanExporter$1.lambda$export$0] - {"traceId": "3bcb3c95d05b2ecbd26ac31e78caec8c","eventTime": 1635240338457300715,"eventName": "exception","attributes": {"exception.message": "Unable to execute request for an existing session: NettyHttpHandler request execution error","exception.stacktrace": "java.lang.RuntimeException: NettyHttpHandler request execution error\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.makeCall(NettyHttpHandler.java:83)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.execute(NettyHttpHandler.java:51)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)\n\tat org.openqa.selenium.remote.http.netty.NettyClient.execute(NettyClient.java:119)\n\tat org.openqa.selenium.remote.tracing.TracedHttpClient.execute(TracedHttpClient.java:55)\n\tat org.openqa.selenium.grid.web.ReverseProxyHandler.execute(ReverseProxyHandler.java:92)\n\tat org.openqa.selenium.grid.router.HandleSession.execute(HandleSession.java:110)\n\tat org.openqa.selenium.remote.http.Route$PredicatedRoute.handle(Route.java:373)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.grid.router.Router.execute(Router.java:91)\n\tat org.openqa.selenium.grid.web.EnsureSpecCompliantResponseHeaders.lambda$apply$0(EnsureSpecCompliantResponseHeaders.java:34)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$NestedRoute.handle(Route.java:270)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.AddWebDriverSpecHeaders.lambda$apply$0(AddWebDriverSpecHeaders.java:35)\n\tat org.openqa.selenium.remote.ErrorFilter.lambda$apply$0(ErrorFilter.java:44)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.remote.ErrorFilter.lambda$apply$0(ErrorFilter.java:44)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.netty.server.SeleniumHandler.lambda$channelRead0$0(SeleniumHandler.java:44)\n\tat java.base\u002fjava.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)\n\tat java.base\u002fjava.util.concurrent.FutureTask.run(FutureTask.java:264)\n\tat java.base\u002fjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)\n\tat java.base\u002fjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)\n\tat java.base\u002fjava.lang.Thread.run(Thread.java:829)\nCaused by: java.util.concurrent.ExecutionException: java.util.concurrent.TimeoutException: Request timeout to 172.23.0.7\u002f172.23.0.7:5555 after 180000 ms\n\tat java.base\u002fjava.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:395)\n\tat java.base\u002fjava.util.concurrent.CompletableFuture.get(CompletableFuture.java:2022)\n\tat org.asynchttpclient.netty.NettyResponseFuture.get(NettyResponseFuture.java:206)\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.makeCall(NettyHttpHandler.java:66)\n\t... 35 more\nCaused by: java.util.concurrent.TimeoutException: Request timeout to 172.23.0.7\u002f172.23.0.7:5555 after 180000 ms\n\tat org.asynchttpclient.netty.timeout.TimeoutTimerTask.expire(TimeoutTimerTask.java:43)\n\tat org.asynchttpclient.netty.timeout.RequestTimeoutTimerTask.run(RequestTimeoutTimerTask.java:50)\n\tat io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:669)\n\tat io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:744)\n\tat io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:469)\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\t... 1 more\n","exception.type": "java.lang.RuntimeException","http.flavor": 1,"http.handler_class": "org.openqa.selenium.grid.router.HandleSession","http.host": "clj-heartbeat01:4444","http.method": "POST","http.request_content_length": "369","http.scheme": "HTTP","http.target": "\u002fsession\u002f56e701c17e041d6a58aea67d9357bdf3\u002felement","http.user_agent": "selenium\u002f3.141.59 (java windows)","session.id": "56e701c17e041d6a58aea67d9357bdf3"}}

09:25:38.489 INFO [GridModel.setAvailability] - Switching node 6ba5452d-7e1d-49d8-a6f2-d647f5254c05 (uri: http://172.23.0.4:5555) from DOWN to UP
09:25:38.519 INFO [GridModel.setAvailability] - Switching node 51cfe841-ee7c-4b31-a3d3-518fe4c6c3ff (uri: http://172.23.0.11:5555) from DOWN to UP
09:25:38.536 INFO [GridModel.setAvailability] - Switching node 368f0d70-e29a-4a74-b5ae-3bc7fc25a7ca (uri: http://172.23.0.12:5555) from DOWN to UP
09:25:38.555 INFO [GridModel.setAvailability] - Switching node 6ac6dec8-89c3-46fe-a141-cd0d62bae768 (uri: http://172.23.0.3:5555) from DOWN to UP
09:25:38.690 INFO [GridModel.setAvailability] - Switching node 77469386-1e9f-4f45-ae38-d4105d7888c2 (uri: http://172.23.0.5:5555) from DOWN to UP
09:25:38.708 INFO [GridModel.setAvailability] - Switching node 46495380-18e2-4a18-b1ba-6409b8af671f (uri: http://172.23.0.7:5555) from DOWN to UP
09:25:43.570 WARN [SeleniumSpanExporter$1.lambda$export$0] - {"traceId": "edb6138ff49821c43611d17b6e18b44f","eventTime": 1635240343568906501,"eventName": "exception","attributes": {"exception.message": "Unable to execute request for an existing session: java.net.ConnectException: Connection refused: \u002f172.23.0.7:5555","exception.stacktrace": "java.io.UncheckedIOException: java.net.ConnectException: Connection refused: \u002f172.23.0.7:5555\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.makeCall(NettyHttpHandler.java:80)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.execute(NettyHttpHandler.java:51)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)\n\tat org.openqa.selenium.remote.http.netty.NettyClient.execute(NettyClient.java:119)\n\tat org.openqa.selenium.remote.tracing.TracedHttpClient.execute(TracedHttpClient.java:55)\n\tat org.openqa.selenium.grid.web.ReverseProxyHandler.execute(ReverseProxyHandler.java:92)\n\tat org.openqa.selenium.grid.router.HandleSession.execute(HandleSession.java:110)\n\tat org.openqa.selenium.remote.http.Route$PredicatedRoute.handle(Route.java:373)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.grid.router.Router.execute(Router.java:91)\n\tat org.openqa.selenium.grid.web.EnsureSpecCompliantResponseHeaders.lambda$apply$0(EnsureSpecCompliantResponseHeaders.java:34)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$NestedRoute.handle(Route.java:270)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.AddWebDriverSpecHeaders.lambda$apply$0(AddWebDriverSpecHeaders.java:35)\n\tat org.openqa.selenium.remote.ErrorFilter.lambda$apply$0(ErrorFilter.java:44)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.remote.ErrorFilter.lambda$apply$0(ErrorFilter.java:44)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.netty.server.SeleniumHandler.lambda$channelRead0$0(SeleniumHandler.java:44)\n\tat java.base\u002fjava.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)\n\tat java.base\u002fjava.util.concurrent.FutureTask.run(FutureTask.java:264)\n\tat java.base\u002fjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)\n\tat java.base\u002fjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)\n\tat java.base\u002fjava.lang.Thread.run(Thread.java:829)\nCaused by: java.net.ConnectException: Connection refused: \u002f172.23.0.7:5555\n\tat org.asynchttpclient.netty.channel.NettyConnectListener.onFailure(NettyConnectListener.java:179)\n\tat org.asynchttpclient.netty.channel.NettyChannelConnector$1.onFailure(NettyChannelConnector.java:108)\n\tat org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:28)\n\tat org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:20)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491)\n\tat io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616)\n\tat io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609)\n\tat io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117)\n\tat io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321)\n\tat io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:707)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\t... 1 more\nCaused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: \u002f172.23.0.7:5555\nCaused by: java.net.ConnectException: Connection refused\n\tat java.base\u002fsun.nio.ch.SocketChannelImpl.checkConnect(Native Method)\n\tat java.base\u002fsun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:777)\n\tat io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)\n\tat io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:707)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\tat java.base\u002fjava.lang.Thread.run(Thread.java:829)\n","exception.type": "java.io.UncheckedIOException","http.flavor": 1,"http.handler_class": "org.openqa.selenium.grid.router.HandleSession","http.host": "clj-heartbeat01:4444","http.method": "POST","http.request_content_length": "205","http.scheme": "HTTP","http.target": "\u002fsession\u002f56e701c17e041d6a58aea67d9357bdf3\u002felement","http.user_agent": "selenium\u002f3.141.59 (java windows)","session.id": "56e701c17e041d6a58aea67d9357bdf3"}}

09:31:38.314 WARN [SeleniumSpanExporter$1.lambda$export$0] - {"traceId": "cb34f0f1e67ebde733f21638f2b070ac","eventTime": 1635240698313527177,"eventName": "exception","attributes": {"exception.message": "Unable to execute request for an existing session: java.net.ConnectException: Connection refused: \u002f172.23.0.6:5555","exception.stacktrace": "java.io.UncheckedIOException: java.net.ConnectException: Connection refused: \u002f172.23.0.6:5555\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.makeCall(NettyHttpHandler.java:80)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)\n\tat org.openqa.selenium.remote.http.netty.NettyHttpHandler.execute(NettyHttpHandler.java:51)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)\n\tat org.openqa.selenium.remote.http.netty.NettyClient.execute(NettyClient.java:119)\n\tat org.openqa.selenium.remote.tracing.TracedHttpClient.execute(TracedHttpClient.java:55)\n\tat org.openqa.selenium.grid.web.ReverseProxyHandler.execute(ReverseProxyHandler.java:92)\n\tat org.openqa.selenium.grid.router.HandleSession.execute(HandleSession.java:110)\n\tat org.openqa.selenium.remote.http.Route$PredicatedRoute.handle(Route.java:373)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.grid.router.Router.execute(Router.java:91)\n\tat org.openqa.selenium.grid.web.EnsureSpecCompliantResponseHeaders.lambda$apply$0(EnsureSpecCompliantResponseHeaders.java:34)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$NestedRoute.handle(Route.java:270)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.http.Route$CombinedRoute.handle(Route.java:336)\n\tat org.openqa.selenium.remote.http.Route.execute(Route.java:68)\n\tat org.openqa.selenium.remote.AddWebDriverSpecHeaders.lambda$apply$0(AddWebDriverSpecHeaders.java:35)\n\tat org.openqa.selenium.remote.ErrorFilter.lambda$apply$0(ErrorFilter.java:44)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.remote.ErrorFilter.lambda$apply$0(ErrorFilter.java:44)\n\tat org.openqa.selenium.remote.http.Filter$1.execute(Filter.java:64)\n\tat org.openqa.selenium.netty.server.SeleniumHandler.lambda$channelRead0$0(SeleniumHandler.java:44)\n\tat java.base\u002fjava.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)\n\tat java.base\u002fjava.util.concurrent.FutureTask.run(FutureTask.java:264)\n\tat java.base\u002fjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)\n\tat java.base\u002fjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)\n\tat java.base\u002fjava.lang.Thread.run(Thread.java:829)\nCaused by: java.net.ConnectException: Connection refused: \u002f172.23.0.6:5555\n\tat org.asynchttpclient.netty.channel.NettyConnectListener.onFailure(NettyConnectListener.java:179)\n\tat org.asynchttpclient.netty.channel.NettyChannelConnector$1.onFailure(NettyChannelConnector.java:108)\n\tat org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:28)\n\tat org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:20)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550)\n\tat io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491)\n\tat io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616)\n\tat io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609)\n\tat io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117)\n\tat io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321)\n\tat io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:707)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\t... 1 more\nCaused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: \u002f172.23.0.6:5555\nCaused by: java.net.ConnectException: Connection refused\n\tat java.base\u002fsun.nio.ch.SocketChannelImpl.checkConnect(Native Method)\n\tat java.base\u002fsun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:777)\n\tat io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)\n\tat io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:707)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)\n\tat io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)\n\tat io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)\n\tat io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\tat java.base\u002fjava.lang.Thread.run(Thread.java:829)\n","exception.type": "java.io.UncheckedIOException","http.flavor": 1,"http.handler_class": "org.openqa.selenium.grid.router.HandleSession","http.host": "clj-heartbeat01:4444","http.method": "POST","http.request_content_length": "233","http.scheme": "HTTP","http.target": "\u002fsession\u002ff68cd24799bcf753161802302c2c8044\u002felement","http.user_agent": "selenium\u002f3.141.59 (java windows)","session.id": "f68cd24799bcf753161802302c2c8044"}}

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x000000076f800000, 873463808, 0) failed; error='Not enough space' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 873463808 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /tmp/hs_err_pid10.log
2021-10-26 09:31:38,543 INFO exited: selenium-grid-hub (exit status 1; not expected)
```


### Operating System

Centos

### Docker Selenium version (tag)

selenium/hub:4.0.0-20211025 and node-chrome:95.0-chromedriver-95.0-20211025

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Uh oh!

[🐛 Bug]: Grid 4 - Selenium hub crashes after a while #1439

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Command used to start Selenium Grid with Docker

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Uh oh!

[🐛 Bug]: Grid 4 - Selenium hub crashes after a while #1439

Description

What happened?

Command used to start Selenium Grid with Docker

Relevant log output

Operating System

Docker Selenium version (tag)

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Development

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