+++ This bug was initially created as a clone of Bug #1140880 +++ If a CLI session is open and there is a long OS-level pause, such as from the hypervisor snapshotting a guest VM, it can cause a race between the shudown and read processing. This was fixed in https://github.com/xnio/xnio/commit/2bdbbf2d2
Fixed in XNIO 3.0.11.
Ivo Studensky <istudens> updated the status of jira XNIO-237 to Reopened
Ivo Studensky <istudens> updated the status of jira XNIO-237 to Closed
FailedQA in EAP 6.3.2.CP.CR1. The following deadlock still exists. Steps to Reproduce: 1. Prepare a running EAP instance with secured management port - optionally in VM 2. Execute export JAVA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=y" 3. In the same terminal, execute "bin/jboss-cli.sh --connect --controller=$EAP_IP --user=admin --password=password ':read-resource'" 4. From yet another terminal, execute "jdb -attach localhost:8787" 5. In JDB: 5.a. Create breakpoint: "stop in org.xnio.channels.FramedMessageChannel.receive(java.nio.ByteBuffer)" 5.b. Resume all threads: "resume" 5.c. [Execute five times] Wait until breakpoint is hit and execute "resume". Either set timeout or be fast so that timeout does not occur first 6. Execute "kill -9 $EAP_PID" - optionally in VM 7. In JDB: 8.a. Remove breakpoint: "clear org.xnio.channels.FramedMessageChannel.receive(java.nio.ByteBuffer)" 8.b. Resume all threads: "resume" 9. Now dump the stack trace of jboss-cli.sh: "kill -3 $JBOSS_CLI_PID" Found one Java-level deadlock: ============================= "Remoting "cli-client" read-1": waiting to lock monitor 0x00007ff9c829b558 (object 0x0000000783433408, a java.lang.String), which is held by "main" "main": waiting to lock monitor 0x00007ff9c8333c48 (object 0x00000007851ae6e0, a java.util.ArrayDeque), which is held by "Remoting "cli-client" read-1" Java stack information for the threads listed above: =================================================== "Remoting "cli-client" read-1": at org.jboss.as.cli.impl.CLIModelControllerClient$ChannelCloseHandler.handleClose(CLIModelControllerClient.java:286) - waiting to lock <0x0000000783433408> (a java.lang.String) at org.jboss.as.cli.impl.CLIModelControllerClient$ChannelCloseHandler.handleClose(CLIModelControllerClient.java:269) at org.jboss.remoting3.spi.SpiUtils.safeHandleClose(SpiUtils.java:54) at org.jboss.remoting3.spi.AbstractHandleableCloseable$CloseHandlerTask.run(AbstractHandleableCloseable.java:501) at org.jboss.remoting3.spi.AbstractHandleableCloseable.runCloseTask(AbstractHandleableCloseable.java:406) at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeComplete(AbstractHandleableCloseable.java:277) at org.jboss.remoting3.remote.RemoteConnectionChannel.closeAction(RemoteConnectionChannel.java:532) at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync(AbstractHandleableCloseable.java:359) at org.jboss.remoting3.remote.RemoteConnectionHandler.closeAllChannels(RemoteConnectionHandler.java:392) - locked <0x00000007851ae6e0> (a java.util.ArrayDeque) at org.jboss.remoting3.remote.RemoteConnectionHandler.handleConnectionClose(RemoteConnectionHandler.java:109) at org.jboss.remoting3.remote.RemoteReadListener.handleEvent(RemoteReadListener.java:81) - locked <0x00000007851ae6e0> (a java.util.ArrayDeque) at org.jboss.remoting3.remote.RemoteReadListener.handleEvent(RemoteReadListener.java:45) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72) at org.xnio.channels.TranslatingSuspendableChannel.handleReadable(TranslatingSuspendableChannel.java:189) at org.xnio.channels.TranslatingSuspendableChannel$1.handleEvent(TranslatingSuspendableChannel.java:103) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72) at org.xnio.channels.TranslatingSuspendableChannel.handleReadable(TranslatingSuspendableChannel.java:189) at org.xnio.ssl.JsseConnectedSslStreamChannel.handleReadable(JsseConnectedSslStreamChannel.java:183) at org.xnio.channels.TranslatingSuspendableChannel$1.handleEvent(TranslatingSuspendableChannel.java:103) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72) at org.xnio.nio.NioHandle.run(NioHandle.java:90) at org.xnio.nio.WorkerThread.run(WorkerThread.java:198) "main": at org.jboss.remoting3.remote.RemoteConnectionChannel.receiveMessage(RemoteConnectionChannel.java:361) - waiting to lock <0x00000007851ae6e0> (a java.util.ArrayDeque) at org.jboss.as.protocol.mgmt.FutureManagementChannel$Establishing.connectionOpened(FutureManagementChannel.java:217) at org.jboss.as.protocol.ProtocolConnectionManager.connect(ProtocolConnectionManager.java:78) - locked <0x0000000784978a00> (a org.jboss.as.protocol.ProtocolConnectionManager) at org.jboss.as.protocol.mgmt.FutureManagementChannel$Establishing.getChannel(FutureManagementChannel.java:204) at org.jboss.as.cli.impl.CLIModelControllerClient.getOrCreateChannel(CLIModelControllerClient.java:160) - locked <0x0000000783433408> (a java.lang.String) at org.jboss.as.cli.impl.CLIModelControllerClient$2.getChannel(CLIModelControllerClient.java:120) at org.jboss.as.protocol.mgmt.ManagementChannelHandler.executeRequest(ManagementChannelHandler.java:123) at org.jboss.as.protocol.mgmt.ManagementChannelHandler.executeRequest(ManagementChannelHandler.java:98) at org.jboss.as.controller.client.impl.AbstractModelControllerClient.executeRequest(AbstractModelControllerClient.java:236) at org.jboss.as.controller.client.impl.AbstractModelControllerClient.execute(AbstractModelControllerClient.java:141) at org.jboss.as.controller.client.impl.AbstractModelControllerClient.executeForResult(AbstractModelControllerClient.java:127) at org.jboss.as.controller.client.impl.AbstractModelControllerClient.execute(AbstractModelControllerClient.java:71) at org.jboss.as.cli.impl.CommandContextImpl.tryConnection(CommandContextImpl.java:980) at org.jboss.as.cli.impl.CommandContextImpl.connectController(CommandContextImpl.java:841) at org.jboss.as.cli.impl.CommandContextImpl.connectController(CommandContextImpl.java:817) at org.jboss.as.cli.impl.CliLauncher.initCommandContext(CliLauncher.java:282) at org.jboss.as.cli.impl.CliLauncher.main(CliLauncher.java:250) at org.jboss.as.cli.CommandLineMain.main(CommandLineMain.java:34) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.jboss.modules.Module.run(Module.java:312) at org.jboss.modules.Main.main(Main.java:460)
Another issue is that CLI locks on a string literal which is not preferable way. org.jboss.as.cli.impl.CLIModelControllerClient: ... private final Object lock = "lock"; ...
Verified in 6.3.3.CP.CR1