Deadlock in Zeppelin during interpreter restart

Found one Java-level deadlock:
=============================
"qtp846238611-295773":
  waiting to lock monitor 0x00007f3cdc099408 (object 0x0000000673c66758, a java.util.LinkedList),
  which is held by "qtp846238611-295335"
"qtp846238611-295335":
  waiting to lock monitor 0x00007f3e98023cd8 (object 0x000000065accda50, a java.util.ArrayList),
  which is held by "qtp846238611-292136"
"qtp846238611-292136":
  waiting to lock monitor 0x00007f3cdc099408 (object 0x0000000673c66758, a java.util.LinkedList),
  which is held by "qtp846238611-295335"Java stack information for the threads listed above:
===================================================
"qtp846238611-295773":
	at org.apache.zeppelin.notebook.Note.getParagraphs(Note.java:750)
	- waiting to lock <0x0000000673c66758> (a java.util.LinkedList)
	at org.apache.zeppelin.notebook.Notebook.getJobListByUnixTime(Notebook.java:872)
	at org.apache.zeppelin.socket.NotebookServer.broadcastUpdateNoteJobInfo(NotebookServer.java:568)
	at org.apache.zeppelin.socket.NotebookServer$ParagraphListenerImpl.afterStatusChange(NotebookServer.java:2333)
	at org.apache.zeppelin.scheduler.Job.setStatus(Job.java:162)
	at org.apache.zeppelin.scheduler.RemoteScheduler.submit(RemoteScheduler.java:154)
	at org.apache.zeppelin.notebook.Paragraph.execute(Paragraph.java:355)
	at org.apache.zeppelin.notebook.Note.run(Note.java:683)
	at org.apache.zeppelin.socket.NotebookServer.persistAndExecuteSingleParagraph(NotebookServer.java:1881)
	at org.apache.zeppelin.socket.NotebookServer.runParagraph(NotebookServer.java:1840)
	at org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:262)
	at org.apache.zeppelin.socket.NotebookSocket.onWebSocketText(NotebookSocket.java:59)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextMessage(JettyListenerEventDriver.java:189)
	at org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:66)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextFrame(JettyListenerEventDriver.java:158)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:162)
	at org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:459)
	at org.eclipse.jetty.websocket.common.extensions.AbstractExtension.nextIncomingFrame(AbstractExtension.java:182)
	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.nextIncomingFrame(PerMessageDeflateExtension.java:105)
	at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension.forwardIncoming(CompressExtension.java:142)
	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.incomingFrame(PerMessageDeflateExtension.java:85)
	at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:220)
	at org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:219)
	at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:244)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:559)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:390)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:748)
"qtp846238611-295335":
	at org.apache.zeppelin.notebook.Note.getParagraphs(Note.java:750)
	- waiting to lock <0x000000065accda50> (a java.util.ArrayList)
	at org.apache.zeppelin.notebook.Notebook.getJobListByUnixTime(Notebook.java:872)
	at org.apache.zeppelin.socket.NotebookServer.broadcastUpdateNoteJobInfo(NotebookServer.java:568)
	at org.apache.zeppelin.socket.NotebookServer$NotebookInformationListener.onParagraphRemove(NotebookServer.java:2194)
	at org.apache.zeppelin.notebook.Notebook.onParagraphRemove(Notebook.java:1084)
	at org.apache.zeppelin.notebook.Note.removeParagraph(Note.java:446)
	- locked <0x0000000673c66758> (a java.util.LinkedList)
	at org.apache.zeppelin.socket.NotebookServer.removeParagraph(NotebookServer.java:1363)
	at org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:283)
	at org.apache.zeppelin.socket.NotebookSocket.onWebSocketText(NotebookSocket.java:59)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextMessage(JettyListenerEventDriver.java:189)
	at org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:66)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextFrame(JettyListenerEventDriver.java:158)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:162)
	at org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:459)
	at org.eclipse.jetty.websocket.common.extensions.AbstractExtension.nextIncomingFrame(AbstractExtension.java:182)
	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.nextIncomingFrame(PerMessageDeflateExtension.java:105)
	at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension.forwardIncoming(CompressExtension.java:142)
	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.incomingFrame(PerMessageDeflateExtension.java:85)
	at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:220)
	at org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:219)
	at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:244)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:559)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:390)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:748)
"qtp846238611-292136":
	at org.apache.zeppelin.notebook.Note.getParagraphs(Note.java:750)
	- waiting to lock <0x0000000673c66758> (a java.util.LinkedList)
	at org.apache.zeppelin.notebook.Notebook.getJobListByUnixTime(Notebook.java:872)
	at org.apache.zeppelin.socket.NotebookServer.broadcastUpdateNoteJobInfo(NotebookServer.java:568)
	at org.apache.zeppelin.socket.NotebookServer$NotebookInformationListener.onParagraphRemove(NotebookServer.java:2194)
	at org.apache.zeppelin.notebook.Notebook.onParagraphRemove(Notebook.java:1084)
	at org.apache.zeppelin.notebook.Note.removeParagraph(Note.java:446)
	- locked <0x000000065accda50> (a java.util.ArrayList)
	at org.apache.zeppelin.socket.NotebookServer.removeParagraph(NotebookServer.java:1363)
	at org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:283)
	at org.apache.zeppelin.socket.NotebookSocket.onWebSocketText(NotebookSocket.java:59)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextMessage(JettyListenerEventDriver.java:189)
	at org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:66)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextFrame(JettyListenerEventDriver.java:158)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:162)
	at org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:459)
	at org.eclipse.jetty.websocket.common.extensions.AbstractExtension.nextIncomingFrame(AbstractExtension.java:182)
	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.nextIncomingFrame(PerMessageDeflateExtension.java:105)
	at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension.forwardIncoming(CompressExtension.java:142)
	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.incomingFrame(PerMessageDeflateExtension.java:85)
	at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:220)
	at org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:219)
	at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:244)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:559)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:390)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)