https://issues.apache.org/bugzilla/show_bug.cgi?id=55524
Bug ID: 55524
Summary: Deadlock produced during Websocket write operation
(org.apache.catalina.websocket.WsOutbound)
Product: Tomcat 7
Version: 7.0.42
Hardware: PC
OS: Linux
Status: NEW
Severity: blocker
Priority: P2
Component: Servlet & JSP API
Assignee: dev@tomcat.apache.org
Reporter: confi...@googlemail.com
Created attachment 30800
--> https://issues.apache.org/bugzilla/attachment.cgi?id=30800&action=edit
thread dump of the deadlock
I use Tomcat with an application that uses Websockets. The websockets are
handled by the Atmosphere framework: https://github.com/Atmosphere/atmosphere
A deadlock occurs during write operations to the websocket.
I have attached a thread dump of the deadlock.
This issue is also duscussed here:
https://github.com/Atmosphere/atmosphere/issues/1264
Here are the deadlocked threads:
Found one Java-level deadlock:
=============================
"Atmosphere-Shared-AsyncOp-267":
waiting to lock monitor 0x00007efebc0015f8 (object 0x00000005ef4c6988, a
org.apache.catalina.websocket.WsOutbound),
which is held by "Atmosphere-Scheduler-2"
"Atmosphere-Scheduler-2":
waiting to lock monitor 0x00007efe8c290ac0 (object 0x00000005ef4b77f8, a
org.atmosphere.cpr.AtmosphereResourceImpl),
which is held by "Atmosphere-Shared-AsyncOp-267"
Java stack information for the threads listed above:
===================================================
"Atmosphere-Shared-AsyncOp-267":
at
org.apache.catalina.websocket.WsOutbound.writeTextMessage(WsOutbound.java:165)
- waiting to lock <0x00000005ef4c6988> (a
org.apache.catalina.websocket.WsOutbound)
at
org.atmosphere.container.version.TomcatWebSocket.write(TomcatWebSocket.java:49)
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:199)
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:168)
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:40)
at
org.atmosphere.cpr.AtmosphereResponse$2.write(AtmosphereResponse.java:574)
at
org.atmosphere.handler.AbstractReflectorAtmosphereHandler.onStateChange(AbstractReflectorAtmosphereHandler.java:169)
at
org.atmosphere.cpr.DefaultBroadcaster.invokeOnStateChange(DefaultBroadcaster.java:1027)
at
org.atmosphere.cpr.DefaultBroadcaster.prepareInvokeOnStateChange(DefaultBroadcaster.java:1047)
at
org.atmosphere.cpr.DefaultBroadcaster.executeAsyncWrite(DefaultBroadcaster.java:921)
at org.atmosphere.cpr.DefaultBroadcaster$3.run(DefaultBroadcaster.java:580)
- locked <0x00000005ef4b77f8> (a org.atmosphere.cpr.AtmosphereResourceImpl)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
"Atmosphere-Scheduler-2":
at
org.atmosphere.cpr.AsynchronousProcessor.completeLifecycle(AsynchronousProcessor.java:476)
- waiting to lock <0x00000005ef4b77f8> (a
org.atmosphere.cpr.AtmosphereResourceImpl)
at
org.atmosphere.cpr.AsynchronousProcessor.timedout(AsynchronousProcessor.java:437)
at
org.atmosphere.cpr.AsynchronousProcessor$AsynchronousProcessorHook.timedOut(AsynchronousProcessor.java:633)
at
org.atmosphere.websocket.DefaultWebSocketProcessor.close(DefaultWebSocketProcessor.java:483)
at
org.atmosphere.container.TomcatWebSocketHandler.onClose(TomcatWebSocketHandler.java:80)
at
org.apache.catalina.websocket.StreamInbound.doOnClose(StreamInbound.java:222)
at
org.apache.catalina.websocket.WsOutbound.doWriteBytes(WsOutbound.java:423)
at
org.apache.catalina.websocket.WsOutbound.doWriteText(WsOutbound.java:442)
at
org.apache.catalina.websocket.WsOutbound.writeTextMessage(WsOutbound.java:174)
- locked <0x00000005ef4c6988> (a org.apache.catalina.websocket.WsOutbound)
at
org.atmosphere.container.version.TomcatWebSocket.write(TomcatWebSocket.java:49)
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:199)
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:168)
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:40)
at
org.atmosphere.cpr.AtmosphereResponse$2.write(AtmosphereResponse.java:574)
at org.atmosphere.cpr.AtmosphereResponse.write(AtmosphereResponse.java:992)
at
org.atmosphere.interceptor.HeartbeatInterceptor$1$1.call(HeartbeatInterceptor.java:104)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
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