stack walk with zgc after 4 days

gistfile1.txt

--- 1572022745 ns (2.64%), 157 samples
  [ 0] AccessInternal::PostRuntimeDispatch<ZBarrierSet::AccessBarrier<1187924ul, ZBarrierSet>, (AccessInternal::BarrierType)2, 1187924ul>::oop_access_barrier(void*)
  [ 1] ResolvedMethodTable::lookup(int, unsigned int, Method*)
  [ 2] java_lang_invoke_ResolvedMethodName::find_resolved_method(methodHandle const&, Thread*)
  [ 3] CallInfo::CallInfo(Method*, Klass*, Thread*)
  [ 4] java_lang_StackFrameInfo::set_method_and_bci(Handle, methodHandle const&, int, Thread*)
  [ 5] JavaFrameStream::fill_frame(int, objArrayHandle, methodHandle const&, Thread*)
  [ 6] StackWalk::fill_in_frames(long, BaseFrameStream&, int, int, objArrayHandle, int&, Thread*)
  [ 7] StackWalk::fetchNextBatch(Handle, long, long, int, int, objArrayHandle, Thread*)
  [ 8] JVM_MoreStackWalk
  [ 9] java.lang.StackStreamFactory$AbstractStackWalker.fetchStackFrames
  [10] java.lang.StackStreamFactory$AbstractStackWalker.fetchStackFrames
  [11] java.lang.StackStreamFactory$AbstractStackWalker.getNextBatch
  [12] java.lang.StackStreamFactory$AbstractStackWalker.peekFrame
  [13] java.lang.StackStreamFactory$AbstractStackWalker.hasNext
  [14] java.lang.StackStreamFactory$StackFrameTraverser.tryAdvance
  [15] java.util.stream.ReferencePipeline.forEachWithCancel
  [16] java.util.stream.AbstractPipeline.copyIntoWithCancel
  [17] java.util.stream.AbstractPipeline.copyInto
  [18] java.util.stream.AbstractPipeline.wrapAndCopyInto
  [19] java.util.stream.FindOps$FindOp.evaluateSequential
  [20] java.util.stream.AbstractPipeline.evaluate
  [21] java.util.stream.ReferencePipeline.findFirst
  [22] org.apache.logging.log4j.util.StackLocator.lambda$getCallerClass$6
  [23] org.apache.logging.log4j.util.StackLocator$$Lambda$47.915349526.apply
  [24] java.lang.StackStreamFactory$StackFrameTraverser.consumeFrames
  [25] java.lang.StackStreamFactory$AbstractStackWalker.doStackWalk
  [26] java.lang.StackStreamFactory$AbstractStackWalker.callStackWalk
  [27] java.lang.StackStreamFactory$AbstractStackWalker.beginStackWalk
  [28] java.lang.StackStreamFactory$AbstractStackWalker.walk
  [29] java.lang.StackWalker.walk
  [30] org.apache.logging.log4j.util.StackLocator.getCallerClass
  [31] org.apache.logging.log4j.util.StackLocatorUtil.getCallerClass
  [32] org.apache.logging.log4j.jcl.LogAdapter.getContext
  [33] org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger
  [34] org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance
  [35] org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance
  [36] org.apache.commons.logging.LogFactory.getLog
  [37] org.springframework.util.ConcurrencyThrottleSupport.<init>
  [38] org.springframework.core.task.SimpleAsyncTaskExecutor$ConcurrencyThrottleAdapter.<init>
  [39] org.springframework.core.task.SimpleAsyncTaskExecutor$ConcurrencyThrottleAdapter.<init>
  [40] org.springframework.core.task.SimpleAsyncTaskExecutor.<init>
  [41] org.springframework.web.context.request.async.WebAsyncManager.<init>
  [42] org.springframework.web.context.request.async.WebAsyncUtils.getAsyncManager
  [43] org.springframework.web.servlet.FrameworkServlet.processRequest
  [44] org.springframework.web.servlet.FrameworkServlet.doGet
  [45] javax.servlet.http.HttpServlet.service
  [46] org.springframework.web.servlet.FrameworkServlet.service
  [47] javax.servlet.http.HttpServlet.service
  [48] org.eclipse.jetty.servlet.ServletHolder.handle
  [49] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [50] com.outbrain.votes_online_db.filter.CookieHandlerFilter.doFilter
  [51] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [52] com.outbrain.cookielib.filter.OBUIDCookieHandlerFilter.doFilter
  [53] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [54] com.outbrain.odb.HdrMetricsFilter.doFilter
  [55] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [56] com.outbrain.tracing.servlet.filter.TraceIdResponseFilter.doFilter
  [57] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [58] io.opentracing.contrib.web.servlet.filter.TracingFilter.doFilter
  [59] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [60] org.eclipse.jetty.servlets.UserAgentFilter.doFilter
  [61] org.eclipse.jetty.servlets.GzipFilter.doFilter
  [62] org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter
  [63] org.eclipse.jetty.servlet.ServletHandler.doHandle
  [64] org.eclipse.jetty.server.handler.ScopedHandler.handle
  [65] org.eclipse.jetty.security.SecurityHandler.handle
  [66] org.eclipse.jetty.server.session.SessionHandler.doHandle
  [67] org.eclipse.jetty.server.handler.ContextHandler.doHandle
  [68] org.eclipse.jetty.servlet.ServletHandler.doScope
  [69] org.eclipse.jetty.server.session.SessionHandler.doScope
  [70] org.eclipse.jetty.server.handler.ContextHandler.doScope
  [71] org.eclipse.jetty.server.handler.ScopedHandler.handle
  [72] org.eclipse.jetty.server.handler.ContextHandlerCollection.handle
  [73] org.eclipse.jetty.server.handler.HandlerCollection.handle
  [74] org.eclipse.jetty.server.handler.HandlerWrapper.handle
  [75] com.outbrain.ob1k.server.jetty.handler.RequestTimeoutHandler.handle
  [76] org.eclipse.jetty.server.handler.HandlerWrapper.handle
  [77] org.eclipse.jetty.server.handler.StatisticsHandler.handle
  [78] org.eclipse.jetty.server.handler.HandlerWrapper.handle
  [79] org.eclipse.jetty.server.Server.handle
  [80] org.eclipse.jetty.server.HttpChannel.handle
  [81] org.eclipse.jetty.server.HttpConnection.onFillable
  [82] org.eclipse.jetty.io.AbstractConnection$2.run
  [83] org.eclipse.jetty.util.thread.QueuedThreadPool.runJob
  [84] org.eclipse.jetty.util.thread.QueuedThreadPool$3.run
  [85] java.lang.Thread.run

Yes - it's explained in detail here: https://mail.openjdk.java.net/pipermail/zgc-dev/2019-March/000605.html

thank you