Name: FelixStartLevel
State: BLOCKED on org.apache.sshd.common.channel.ChannelOutputStream@5cd9d93 owned by: sshd-SshServer[7df772af]-nio2-thread-3
Total blocked: 87  Total waited: 59

Stack trace: 
org.apache.sshd.common.channel.ChannelOutputStream.flush(ChannelOutputStream.java:168)
org.apache.karaf.shell.ssh.ShellFactoryImpl.flush(ShellFactoryImpl.java:164)
org.apache.karaf.shell.ssh.ShellFactoryImpl.access$100(ShellFactoryImpl.java:46)
org.apache.karaf.shell.ssh.ShellFactoryImpl$ShellImpl.destroy(ShellFactoryImpl.java:118)
org.apache.sshd.server.channel.ChannelSession.doCloseImmediately(ChannelSession.java:192)
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:82)
org.apache.sshd.common.channel.AbstractChannel.close(AbstractChannel.java:573)
org.apache.sshd.common.util.closeable.ParallelCloseable.doClose(ParallelCloseable.java:61)
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
org.apache.sshd.common.util.closeable.AbstractInnerCloseable.doCloseImmediately(AbstractInnerCloseable.java:46)
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:82)
org.apache.sshd.common.util.closeable.ParallelCloseable.doClose(ParallelCloseable.java:61)
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:55)
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
org.apache.sshd.common.util.closeable.SequentialCloseable.doClose(SequentialCloseable.java:68)
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
org.apache.sshd.common.util.closeable.AbstractInnerCloseable.doCloseImmediately(AbstractInnerCloseable.java:46)
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:82)
org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.sessionClosed(AbstractSessionIoHandler.java:48)
org.apache.sshd.common.io.nio2.Nio2Session.doCloseImmediately(Nio2Session.java:233)
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:82)
org.apache.sshd.common.util.closeable.ParallelCloseable.doClose(ParallelCloseable.java:61)
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
org.apache.sshd.common.util.closeable.AbstractInnerCloseable.doCloseImmediately(AbstractInnerCloseable.java:46)
org.apache.sshd.common.io.nio2.Nio2Acceptor.doCloseImmediately(Nio2Acceptor.java:159)
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:82)
org.apache.sshd.common.io.nio2.Nio2Acceptor.close(Nio2Acceptor.java:138)
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:55)
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
org.apache.sshd.common.future.AbstractSshFuture.notifyListener(AbstractSshFuture.java:153)
org.apache.sshd.common.future.DefaultSshFuture.addListener(DefaultSshFuture.java:163)
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:56)
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
org.apache.sshd.common.util.closeable.SequentialCloseable.doClose(SequentialCloseable.java:68)
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
org.apache.sshd.common.util.closeable.AbstractInnerCloseable.doCloseImmediately(AbstractInnerCloseable.java:46)
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:82)
org.apache.sshd.server.SshServer.stop(SshServer.java:350)
org.apache.karaf.shell.ssh.Activator.doStop(Activator.java:138)
org.apache.karaf.util.tracker.BaseActivator.stop(BaseActivator.java:108)
org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:719)
org.apache.felix.framework.Felix.stopBundle(Felix.java:2636)
org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1391)
org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308)
java.base@11.0.4/java.lang.Thread.run(Thread.java:834)