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Wildfly lack of responsiveness and channel closed

Hi, I'm writing here in search for help.

My application runs on wildfly (version 21) and after random time it stops responding to the clients.

 

The structure is:

- Administrative panel for normal administration (war file).

- Api project for the clients that they exchange messages via websocket with this api (another war file).

 

Behaviour:

Everything works until api server start to slow down with responsiveness until nothing works after an hour and only after then the administrative panel also stops working.

 

I've bought the fastthread pro plan and the ML indicates this problem:
37 threads were executing sun.nio.ch.EPoll.wait(java.base@11.0.23/Native Method). It can slow down transactions.

 

In the logs there is this recurring error:

- (default task-214) java.io.IOException: UT002002: Channel is closed

2024-07-16 09:16:08,656 ERROR [stderr] (default task-214) java.io.IOException: UT002002: Channel is closed
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.websockets.core.WebSocketChannel.send(WebSocketChannel.java:343)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.websockets.core.WebSockets.sendBlockingInternal(WebSockets.java:992)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.websockets.core.WebSockets.sendBlockingInternal(WebSockets.java:986)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.websockets.core.WebSockets.sendTextBlocking(WebSockets.java:200)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at io.undertow.websocket@2.2.4.Final//io.undertow.websockets.jsr.WebSocketSessionRemoteEndpoint$BasicWebSocketSessionRemoteEndpoint.sendObjectImpl(WebSocketSessionRemoteEndpoint.java:351)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at io.undertow.websocket@2.2.4.Final//io.undertow.websockets.jsr.WebSocketSessionRemoteEndpoint$BasicWebSocketSessionRemoteEndpoint.sendObject(WebSocketSessionRemoteEndpoint.java:340)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.masterchart.api.FrontController.postAttach(FrontController.java:265)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at java.base/java.lang.reflect.Method.invoke(Method.java:566)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060)
2024-07-16 09:16:08,656 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at javax.servlet.api@2.0.0.Final//javax.servlet.http.HttpServlet.service(HttpServlet.java:523)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at javax.servlet.api@2.0.0.Final//javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.websocket@2.2.4.Final//io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:173)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:126)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:64)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:101)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:119)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at deployment.my-api-server.war//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
2024-07-16 09:16:08,657 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at io.undertow.core@2.2.4.Final//io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:841)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1363)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at org.jboss.xnio@3.8.4.Final//org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280)
2024-07-16 09:16:08,658 ERROR [stderr] (default task-214)       at java.base/java.lang.Thread.run(Thread.java:829)

 

I really don't get why after random time the channel is in status closed, maybe its linked to the sun.nio.ch.EPoll.wait problem.

 

It appears only when the server starts to having issues, the server can work for hours without having issues.

The apis are written using spring boot.

 

If something has to be changed in this question, I will.

 

All advice welcome.

Thank you in advance.

 

Report URL - https://fastthread.io/my-thread-report.jsp?p=c2hhcmVkLzIwMjQvMDcvMTUvNDY1NC50eHQtLTgtMzktNDg=

  • wildfly

  • websocket

  • springboot

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Mahesh

Hello,

Your API server (WAR file) using WebSockets experiences slowdowns over time. This slowness appears to be linked to the sun.nio.ch.EPoll.wait(java.base@11.0.23/Native Method) calls in the thread dump, indicating issues with waiting for I/O events. The error message "UT002002: Channel is closed" suggests that the communication channel between the server and client is unexpectedly closing.

 

Possible Causes:

  1. Resource Management Issues: The combination of symptoms points to potential problems with resource management, such as thread pool exhaustion or improper handling of WebSocket connections.
  2. Improper Connection Closure: Clients may not be closing connections properly, leading to a buildup of open channels. This accumulation can overwhelm the server's resources, causing slowdowns.
  3. Inefficient Message Handling: The code handling incoming WebSocket messages might be inefficient, leading to processing delays.
  4. Memory Management Problems: Memory leaks or excessive object creation could be causing garbage collection overhead, slowing down the application.

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wildfly_user

Thank you,

 

I'll proceed searching the issue following this way

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Kousika M

Hello,

Greetings!

There could be several reasons why application is goes responsiveness and channel closed. Some of the reasons are:

 

  • Garbage collection pauses
  • Threads getting BLOCKED
  • Network connectivity
  • Load balancer routing issue
  • Heavy CPU consumption of threads
  • Operating System running with old patches
  • Memory Leak
  • DB not responding properly
  • Kernel issues
  • Backend slow downs
  • Hypervisor/container orchestrator not allocating enough resources

 

:

 

:

 

 So just thread dump is not enough to diagnose the problem. You have captured only thread dump, that too one snapshot of it. It's always a good practice to capture 3 thread dumps in a gap of 10 seconds between each one. Besides thread dumps you might have to capture other logs/artifacts to do thorough analysis.

 

 You can use the open source yCrash script which will capture 360-degree application level artifacts (like GC logs, 3 snapshots of thread dumps, heap dumps) and system level artifacts (like top, top -H, netstat, vmstat, iostat, dmesg, diskusage, kernel parameters...). Once you have these data, either you can manually analyze them or upload it to yCrash tool, which will analyze all these artifacts and generate root cause analysis report. It has potential to indicate the root cause of the problem.

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