Name: sshd-SshServer[7df772af]-nio2-thread-2
State: BLOCKED on org.apache.karaf.log.core.internal.LogServiceImpl@44449f40 owned by: sshd-SshServer[7df772af]-nio2-thread-3
Total blocked: 34  Total waited: 156

Stack trace: 
org.apache.karaf.log.core.internal.LogServiceImpl.doAppend(LogServiceImpl.java:176)
org.ops4j.pax.logging.spi.support.PaxAppenderProxy.doAppend(PaxAppenderProxy.java:69)
org.ops4j.pax.logging.log4j2.internal.bridges.PaxOsgiAppender.append(PaxOsgiAppender.java:100)
org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:543)
org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:502)
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:485)
org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:534)
org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:504)
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:485)
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:412)
org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
org.apache.logging.log4j.core.Logger.logMessage(Logger.java:154)
org.ops4j.pax.logging.log4j2.internal.PaxLoggerImpl.doLog0(PaxLoggerImpl.java:354)
org.ops4j.pax.logging.log4j2.internal.PaxLoggerImpl.doLog(PaxLoggerImpl.java:337)
org.ops4j.pax.logging.log4j2.internal.PaxLoggerImpl.debug(PaxLoggerImpl.java:142)
org.ops4j.pax.logging.internal.TrackingLogger.debug(TrackingLogger.java:115)
org.ops4j.pax.logging.slf4j.Slf4jLogger.debug(Slf4jLogger.java:340)
org.apache.sshd.common.io.nio2.Nio2Session.writePacket(Nio2Session.java:136)
org.apache.sshd.common.session.helpers.AbstractSession.doWritePacket(AbstractSession.java:1154)
   - locked java.lang.Object@301097fe
org.apache.sshd.common.session.helpers.AbstractSession.writePacket(AbstractSession.java:1096)
org.apache.sshd.common.channel.AbstractChannel.sendResponse(AbstractChannel.java:369)
org.apache.sshd.server.channel.ChannelSession.sendResponse(ChannelSession.java:336)
org.apache.sshd.common.channel.AbstractChannel.handleChannelRequest(AbstractChannel.java:302)
org.apache.sshd.common.channel.AbstractChannel.handleRequest(AbstractChannel.java:270)
org.apache.sshd.common.session.helpers.AbstractConnectionService.channelRequest(AbstractConnectionService.java:517)
org.apache.sshd.common.session.helpers.AbstractConnectionService.process(AbstractConnectionService.java:341)
org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:614)
org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:547)
   - locked java.lang.Object@3ba9af64
org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1498)
org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:508)
   - locked java.lang.Object@3dd3ed44
org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:66)
org.apache.sshd.common.io.nio2.Nio2Session.handleReadCycleCompletion(Nio2Session.java:301)
org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:281)
org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:278)
org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$completed$0(Nio2CompletionHandler.java:38)
org.apache.sshd.common.io.nio2.Nio2CompletionHandler$$Lambda$561/0x0000000100612840.run(Unknown Source)
java.base@11.0.4/java.security.AccessController.doPrivileged(Native Method)
org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37)
java.base@11.0.4/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:127)
java.base@11.0.4/sun.nio.ch.Invoker$2.run(Invoker.java:219)
java.base@11.0.4/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
java.base@11.0.4/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base@11.0.4/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
java.base@11.0.4/java.lang.Thread.run(Thread.java:834)