[🐛 Bug]: Selenium Grid Hub intermittently fails to create new sessions (HTTP 500): SequentialScheduler task rejected / ThreadPoolExecutor “Shutting down”

[rookieInTraining]

Description

The issue is similar to one reported at #14280

We are seeing intermittent failures while creating new Selenium sessions against Grid. The client receives:

• org.openqa.selenium.SessionNotCreatedException
• HTTP 500
• Root cause in message indicates a Java HTTP client task rejected because the underlying executor is shutting down:
  jdk.internal.net.http.common.SequentialScheduler$SchedulableTask ... rejected from ThreadPoolExecutor ... [Shutting down ...]

This suggests the Hub (or its internal HTTP client/executor) is shutting down/restarting or being terminated while still receiving new session requests, leading to session creation failures.

Stacktrace

org.openqa.selenium.SessionNotCreatedException: Could not start a new session. Response code 500. Message: Could not start a new session. java.io.IOException: Task jdk.internal.net.http.common.SequentialScheduler$SchedulableTask@70cf1cfc rejected from java.util.concurrent.ThreadPoolExecutor@25b0836a[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 56] 
    Host info: host: 'selenium-hub-668784c48d-4x88s', ip: '10.102.38.164'
    Build info: version: '4.39.0', revision: '126f156aee'
    System info: os.name: 'Linux', os.arch: 'amd64', os.version: '6.6.72+', java.version: '21.0.9'
    Driver info: driver.version: unknown
    Build info: version: '4.39.0', revision: '126f156aee'
    System info: os.name: 'Linux', os.arch: 'amd64', os.version: '5.14.0-611.24.1.el9_7.x86_64', java.version: '17.0.17'
    Driver info: org.openqa.selenium.remote.RemoteWebDriver
    Command: [null, newSession {capabilities=[Capabilities {acceptInsecureCerts: true, browserName: chrome, goog:chromeOptions: {args: [--kiosk-printing, --no-sandbox, --disable-dev-shm-usage, --disable-gpu, --ignore-certificate-errors, --disable-extensions, --disable-infobars, --remote-allow-origins=*, --disable-features=Download..., --disable-popup-blocking, --allow-outdated-plugins, --enable-audio-output, --autoplay-policy=no-user-g..., --enable-logging, --v=2, --enable-notifications, --disable-popup-blocking, --use-fake-device-for-media..., --use-fake-ui-for-media-stream], extensions: [], prefs: {credentials_enable_service: false, download.default_directory: /mnt1/jenkins/workspace/Kno..., download.prompt_for_download: false, printing.print_preview_sticky_settings.appState: {"recentDestinations": [{"i..., profile.default_content_setting_values.clipboard: 1, profile.default_content_setting_values.media_stream: 1, profile.default_content_setting_values.media_stream_mic: 1, profile.default_content_setting_values.notifications: 1, profile.default_content_setting_values.sound: 1, profile.default_content_settings.automatic_downloads: 1, profile.default_content_settings.popups: 0, profile.password_manager_enabled: false, safebrowsing.enabled: true, safebrowsing_for_trusted_sources_enabled: false}, w3c: true}, goog:loggingPrefs: org.openqa.selenium.logging..., pageLoadStrategy: none, se:name: Retry_KB_UI_..., unhandledPromptBehavior: accept}]}]
    Capabilities {acceptInsecureCerts: true, browserName: chrome, goog:chromeOptions: {args: [--kiosk-printing, --no-sandbox, --disable-dev-shm-usage, --disable-gpu, --ignore-certificate-errors, --disable-extensions, --disable-infobars, --remote-allow-origins=*, --disable-features=Download..., --disable-popup-blocking, --allow-outdated-plugins, --enable-audio-output, --autoplay-policy=no-user-g..., --enable-logging, --v=2, --enable-notifications, --disable-popup-blocking, --use-fake-device-for-media..., --use-fake-ui-for-media-stream], extensions: [], prefs: {credentials_enable_service: false, download.default_directory: /mnt1/jenkins/workspace/Kno..., download.prompt_for_download: false, printing.print_preview_sticky_settings.appState: {"recentDestinations": [{"i..., profile.default_content_setting_values.clipboard: 1, profile.default_content_setting_values.media_stream: 1, profile.default_content_setting_values.media_stream_mic: 1, profile.default_content_setting_values.notifications: 1, profile.default_content_setting_values.sound: 1, profile.default_content_settings.automatic_downloads: 1, profile.default_content_settings.popups: 0, profile.password_manager_enabled: false, safebrowsing.enabled: true, safebrowsing_for_trusted_sources_enabled: false}, w3c: true}, goog:loggingPrefs: org.openqa.selenium.logging..., pageLoadStrategy: none, se:name: Retry_KB_UI_..., unhandledPromptBehavior: accept}
    	at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:114)
    	at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:75)
    	at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:61)
    	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:187)
    	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:561)
    	at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:250)
    	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:178)
    	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:164)
    	at com.spr.core.ui.browser.Browser.createDriverWithTimeout(Browser.java:249)
    	at com.spr.core.ui.browser.Browser.getRemoteDriver(Browser.java:41)
    	at com.spr.core.ui.WebDriverThread.setExecutionStyle(WebDriverThread.java:152)
    	at com.spr.core.ui.WebDriverThread.getDriver(WebDriverThread.java:65)
    	at com.spr.core.ui.BrowserInit.getDriver(BrowserInit.java:215)
    	at com.spr.core.ui.BrowserInit.checkSession(BrowserInit.java:141)
    	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
    	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethodConsideringTimeout(MethodInvocationHelper.java:69)
    	at org.testng.internal.invokers.ConfigInvoker.invokeConfigurationMethod(ConfigInvoker.java:390)
    	at org.testng.internal.invokers.ConfigInvoker.invokeConfigurations(ConfigInvoker.java:325)
    	at org.testng.internal.invokers.TestInvoker.runConfigMethods(TestInvoker.java:810)
    	at org.testng.internal.invokers.TestInvoker.invokeMethod(TestInvoker.java:577)
    	at org.testng.internal.invokers.TestInvoker.invokeTestMethod(TestInvoker.java:227)
    	at org.testng.internal.invokers.MethodRunner.runInSequence(MethodRunner.java:50)
    	at org.testng.internal.invokers.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:957)
    	at org.testng.internal.invokers.TestInvoker.invokeTestMethods(TestInvoker.java:200)
    	at org.testng.internal.invokers.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:148)
    	at org.testng.internal.invokers.TestMethodWorker.run(TestMethodWorker.java:128)
    	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
    	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
    	at java.base/java.lang.Thread.run(Thread.java:842)

Reproducible Code

static RemoteWebDriver getRemoteDriver(DriverInitContext context, URL remoteUrl, Capabilities capabilities) {
        RemoteWebDriver driver = createDriverWithTimeout(context, remoteUrl, capabilities, SESSION_CREATION_MAX_WAIT);
        driver.setFileDetector(new LocalFileDetector());
        return driver;
}

// Try creating a session with retries until timeout because the grid might be busy
private static RemoteWebDriver createDriverWithTimeout(DriverInitContext context, URL remoteUrl, Capabilities capabilities, long timeout) {
    RemoteWebDriver driver = null;
    Throwable cause = null;
    final long start = System.currentTimeMillis();
    boolean retry = true;
    while (driver == null && retry) {
        retry = false;
        try {
            driver = new RemoteWebDriver(remoteUrl, capabilities, false);
        } catch (SessionNotCreatedException e) {
            cause = e.getCause();
            if (cause instanceof TimeoutException
                    && System.currentTimeMillis() - start < timeout
                    && context.getCumulativeSessionCreationWait().get() < CUMULATIVE_SESSION_CREATION_MAX_WAIT) {
                retry = true;
            } else {
                e.printStackTrace();
            }
        }
    }
    context.getCumulativeSessionCreationWait().addAndGet(System.currentTimeMillis() - start);

    if (driver != null) {
        return driver;
    } else {
        // If driver is still null after retries, throw SessionNotCreatedException
        throw new SessionNotCreatedException("Failed to create a session. Unable to find the session even after retries.");
    }
}

Debugging Logs

Jaeger Trace:


{
    "data": [
        {
            "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
            "spans": [
                {
                    "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                    "spanID": "fc4c5c6d05f4c71c",
                    "operationName": "session_queue",
                    "references": [],
                    "startTime": 1770139417152176,
                    "duration": 1439406,
                    "tags": [
                        {
                            "key": "span.kind",
                            "type": "string",
                            "value": "server"
                        },
                        {
                            "key": "http.target",
                            "type": "string",
                            "value": "/session"
                        },
                        {
                            "key": "random.key",
                            "type": "string",
                            "value": "c4c55adc-da7e-41e4-9fb4-f0471f7c3f46"
                        },
                        {
                            "key": "http.method",
                            "type": "string",
                            "value": "POST"
                        },
                        {
                            "key": "http.status_code",
                            "type": "int64",
                            "value": 500
                        },
                        {
                            "key": "span.kind",
                            "type": "string",
                            "value": "internal"
                        },
                        {
                            "key": "otel.status_code",
                            "type": "string",
                            "value": "ERROR"
                        },
                        {
                            "key": "error",
                            "type": "bool",
                            "value": true
                        },
                        {
                            "key": "otel.status_description",
                            "type": "string",
                            "value": "Kind: INTERNAL Description:"
                        },
                        {
                            "key": "internal.span.format",
                            "type": "string",
                            "value": "otlp"
                        }
                    ],
                    "logs": [
                        {
                            "timestamp": 1770139418591582,
                            "fields": [
                                {
                                    "key": "event",
                                    "type": "string",
                                    "value": "HTTP request execution complete"
                                },
                                {
                                    "key": "http.client_ip",
                                    "type": "string",
                                    "value": "10.56.33.91"
                                },
                                {
                                    "key": "http.flavor",
                                    "type": "int64",
                                    "value": 1
                                },
                                {
                                    "key": "http.handler_class",
                                    "type": "string",
                                    "value": "org.openqa.selenium.grid.sessionqueue.local.LocalNewSessionQueue"
                                },
                                {
                                    "key": "http.host",
                                    "type": "string",
                                    "value": "qa6-selenium-grid-care-int.sprinklr.com"
                                },
                                {
                                    "key": "http.method",
                                    "type": "string",
                                    "value": "POST"
                                },
                                {
                                    "key": "http.request_content_length",
                                    "type": "string",
                                    "value": "2419"
                                },
                                {
                                    "key": "http.scheme",
                                    "type": "string",
                                    "value": "HTTP"
                                },
                                {
                                    "key": "http.status_code",
                                    "type": "int64",
                                    "value": 500
                                },
                                {
                                    "key": "http.target",
                                    "type": "string",
                                    "value": "/session"
                                },
                                {
                                    "key": "http.user_agent",
                                    "type": "string",
                                    "value": "selenium/4.39.0 (java unix)"
                                }
                            ]
                        }
                    ],
                    "processID": "p1",
                    "warnings": null
                },
                {
                    "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                    "spanID": "860f708a9e2a3da5",
                    "operationName": "sessionqueue.add_to_queue",
                    "references": [
                        {
                            "refType": "CHILD_OF",
                            "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                            "spanID": "fc4c5c6d05f4c71c"
                        }
                    ],
                    "startTime": 1770139417152886,
                    "duration": 1438568,
                    "tags": [
                        {
                            "key": "span.kind",
                            "type": "string",
                            "value": "internal"
                        },
                        {
                            "key": "internal.span.format",
                            "type": "string",
                            "value": "otlp"
                        }
                    ],
                    "logs": [],
                    "processID": "p1",
                    "warnings": null
                },
                {
                    "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                    "spanID": "c24b501e7d8fd19f",
                    "operationName": "distributor.poll_queue",
                    "references": [
                        {
                            "refType": "CHILD_OF",
                            "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                            "spanID": "fc4c5c6d05f4c71c"
                        }
                    ],
                    "startTime": 1770139417154035,
                    "duration": 1436607,
                    "tags": [
                        {
                            "key": "request.id",
                            "type": "string",
                            "value": "94572db9-786a-4b69-9e1c-c2d135572b34"
                        },
                        {
                            "key": "span.kind",
                            "type": "string",
                            "value": "internal"
                        },
                        {
                            "key": "internal.span.format",
                            "type": "string",
                            "value": "otlp"
                        }
                    ],
                    "logs": [],
                    "processID": "p1",
                    "warnings": null
                },
                {
                    "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                    "spanID": "d4c300b92343896d",
                    "operationName": "distributor.new_session",
                    "references": [
                        {
                            "refType": "CHILD_OF",
                            "traceID": "f3d4387f3c20c9748a6eeaf5d9301e69",
                            "spanID": "c24b501e7d8fd19f"
                        }
                    ],
                    "startTime": 1770139417154150,
                    "duration": 1435620,
                    "tags": [
                        {
                            "key": "error",
                            "type": "bool",
                            "value": true
                        },
                        {
                            "key": "span.kind",
                            "type": "string",
                            "value": "internal"
                        },
                        {
                            "key": "otel.status_code",
                            "type": "string",
                            "value": "ERROR"
                        },
                        {
                            "key": "error",
                            "type": "bool",
                            "value": true
                        },
                        {
                            "key": "otel.status_description",
                            "type": "string",
                            "value": "Kind: ABORTED Description:"
                        },
                        {
                            "key": "internal.span.format",
                            "type": "string",
                            "value": "otlp"
                        }
                    ],
                    "logs": [
                        {
                            "timestamp": 1770139417154428,
                            "fields": [
                                {
                                    "key": "event",
                                    "type": "string",
                                    "value": "Session request received by the Distributor"
                                },
                                {
                                    "key": "logger",
                                    "type": "string",
                                    "value": "org.openqa.selenium.grid.distributor.local.LocalDistributor"
                                },
                                {
                                    "key": "request.payload",
                                    "type": "string",
                                    "value": "[Capabilities {acceptInsecureCerts: true, browserName: chrome, goog:chromeOptions: {args: [--kiosk-printing, --no-sandbox, --disable-dev-shm-usage, --disable-gpu, --ignore-certificate-errors, --disable-extensions, --disable-infobars, --remote-allow-origins=*, --disable-features=Download..., --disable-popup-blocking, --allow-outdated-plugins, --enable-audio-output, --autoplay-policy=no-user-g..., --enable-logging, --v=2, --enable-notifications, --disable-popup-blocking, --use-fake-device-for-media..., --use-fake-ui-for-media-stream], extensions: [], prefs: {credentials_enable_service: false, download.default_directory: /mnt1/jenkins/workspace/sev..., download.prompt_for_download: false, printing.print_preview_sticky_settings.appState: {\"recentDestinations\": [{\"i..., profile.default_content_setting_values.clipboard: 1, profile.default_content_setting_values.media_stream: 1, profile.default_content_setting_values.media_stream_mic: 1, profile.default_content_setting_values.notifications: 1, profile.default_content_setting_values.sound: 1, profile.default_content_settings.automatic_downloads: 1, profile.default_content_settings.popups: 0, profile.password_manager_enabled: false, safebrowsing.enabled: true, safebrowsing_for_trusted_sources_enabled: false}, w3c: true}, goog:loggingPrefs: {browser: ALL}, pageLoadStrategy: none, se:name: sev1/Service_Conversational..., unhandledPromptBehavior: accept}]"
                                }
                            ]
                        },
                        {
                            "timestamp": 1770139418589770,
                            "fields": [
                                {
                                    "key": "event",
                                    "type": "string",
                                    "value": "exception"
                                },
                                {
                                    "key": "exception.message",
                                    "type": "string",
                                    "value": "Unable to create session: Could not start a new session. java.io.IOException: Task jdk.internal.net.http.common.SequentialScheduler$SchedulableTask@5affbf0 rejected from java.util.concurrent.ThreadPoolExecutor@60c48c82[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 84] \nHost info: host: 'selenium-hub-668784c48d-4x88s', ip: '10.102.38.164'\nBuild info: version: '4.39.0', revision: '126f156aee'\nSystem info: os.name: 'Linux', os.arch: 'amd64', os.version: '6.6.72+', java.version: '21.0.9'\nDriver info: driver.version: unknown"
                                },
                                {
                                    "key": "exception.stacktrace",
                                    "type": "string",
                                    "value": "org.openqa.selenium.SessionNotCreatedException: Could not start a new session. java.io.IOException: Task jdk.internal.net.http.common.SequentialScheduler$SchedulableTask@5affbf0 rejected from java.util.concurrent.ThreadPoolExecutor@60c48c82[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 84] \nHost info: host: 'selenium-hub-668784c48d-4x88s', ip: '10.102.38.164'\nBuild info: version: '4.39.0', revision: '126f156aee'\nSystem info: os.name: 'Linux', os.arch: 'amd64', os.version: '6.6.72+', java.version: '21.0.9'\nDriver info: driver.version: unknown\n\tat org.openqa.selenium.grid.distributor.local.LocalDistributor.startSession(LocalDistributor.java:431)\n\tat org.openqa.selenium.grid.distributor.local.LocalDistributor.newSession(LocalDistributor.java:346)\n\tat org.openqa.selenium.grid.distributor.local.LocalDistributor$NewSessionRunnable.handleNewSessionRequest(LocalDistributor.java:601)\n\tat org.openqa.selenium.grid.distributor.local.LocalDistributor$NewSessionRunnable.lambda$run$1(LocalDistributor.java:551)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)\n\tat java.base/java.lang.Thread.run(Thread.java:1583)\nCaused by: java.io.UncheckedIOException: java.io.IOException: Task jdk.internal.net.http.common.SequentialScheduler$SchedulableTask@5affbf0 rejected from java.util.concurrent.ThreadPoolExecutor@60c48c82[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 84]\n\tat org.openqa.selenium.remote.http.jdk.JdkHttpClient.execute0(JdkHttpClient.java:503)\n\tat org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:44)\n\tat org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:55)\n\tat org.openqa.selenium.remote.http.jdk.JdkHttpClient.lambda$executeAsync$2(JdkHttpClient.java:388)\n\tat java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)\n\tat java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)\n\t... 3 more\nCaused by: java.io.IOException: Task jdk.internal.net.http.common.SequentialScheduler$SchedulableTask@5affbf0 rejected from java.util.concurrent.ThreadPoolExecutor@60c48c82[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 84]\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl.send(HttpClientImpl.java:972)\n\tat java.net.http/jdk.internal.net.http.HttpClientFacade.send(HttpClientFacade.java:133)\n\tat org.openqa.selenium.remote.http.jdk.JdkHttpClient.execute0(JdkHttpClient.java:462)\n\t... 8 more\nCaused by: java.util.concurrent.RejectedExecutionException: Task jdk.internal.net.http.common.SequentialScheduler$SchedulableTask@5affbf0 rejected from java.util.concurrent.ThreadPoolExecutor@60c48c82[Shutting down, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 84]\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2081)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:841)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1376)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$DelegatingExecutor.ensureExecutedAsync(HttpClientImpl.java:183)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$DelegatingExecutor.execute(HttpClientImpl.java:175)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:282)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:251)\n\tat java.net.http/jdk.internal.net.http.Http1AsyncReceiver.onReadError(Http1AsyncReceiver.java:516)\n\tat java.net.http/jdk.internal.net.http.Http1AsyncReceiver$Http1TubeSubscriber.onComplete(Http1AsyncReceiver.java:601)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$ReadSubscription.signalCompletion(SocketTube.java:648)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.read(SocketTube.java:853)\n\tat java.net.http/jdk.internal.net.http.SocketTube$SocketFlowTask.run(SocketTube.java:181)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:280)\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:233)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.signalReadable(SocketTube.java:782)\n\tat java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$ReadEvent.signalEvent(SocketTube.java:965)\n\tat java.net.http/jdk.internal.net.http.SocketTube$SocketFlowEvent.handle(SocketTube.java:253)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.handleEvent(HttpClientImpl.java:1477)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.lambda$run$3(HttpClientImpl.java:1422)\n\tat java.base/java.util.ArrayList.forEach(ArrayList.java:1596)\n\tat java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.run(HttpClientImpl.java:1422)\n"
                                },
                                {
                                    "key": "exception.type",
                                    "type": "string",
                                    "value": "org.openqa.selenium.SessionNotCreatedException"
                                },
                                {
                                    "key": "logger",
                                    "type": "string",
                                    "value": "org.openqa.selenium.grid.distributor.local.LocalDistributor"
                                },
                                {
                                    "key": "request.payload",
                                    "type": "string",
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[selenium-ci]

@rookieInTraining, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide

[github-actions]

⚠️ You reported using Selenium version 4.39.0, but the latest release is 4.40.

Please verify that this issue still occurs with the latest version. If it no longer applies, you can close this issue or update your comment.

This issue will be marked "awaiting answer" and may be closed automatically if no response is received.