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<p class="MsoNormal"><span style="color:#1F497D">I’m still trying to gauge the release process for Undertow, and where in that process this issue sits, so as to decide how to roll things out to customers on my end:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo11"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">I see UNDERTOW-479 was entered for this deadlock.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo11"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">I see a patch for this was pulled into Undertow 1.3.0 Beta 3
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo11"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">The patch has not been back-ported to prior releases.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo11"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">The Jira case is still open.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">What can I expect to see in the coming days? I need an answer to give management for the question of ‘How soon will the patch be deemed production-ready?’, but I’d appreciate any additional insight that can
be provided.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">//EricP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Eric Peters
<br>
<b>Sent:</b> Thursday, June 25, 2015 5:23 PM<br>
<b>To:</b> Eric Peters; undertow-dev@lists.jboss.org<br>
<b>Subject:</b> RE: InSessionMemoryManager synchronized methods<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I stand corrected – This is 50% of what brought our server down.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The other half of the deadlock belongs to Seam:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.InMemorySessionManager$SessionImpl.bumpTimeout() (line: 271)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.InMemorySessionManager$SessionImpl.getAttribute(java.lang.String) (line: 355)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.spec.HttpSessionImpl.getAttribute(java.lang.String)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">com.sun.faces.context.SessionMap.get(java.lang.Object)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.contexts.ServerConversationContext.get(java.lang.String) (line: 110)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.contexts.Contexts.lookupInStatefulContexts(java.lang.String) (line: 189)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.Component.getInstanceFromFactory(java.lang.String, org.jboss.seam.ScopeType) (line: 2088)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.Component.getInstance(java.lang.String, boolean, boolean, java.lang.Object, org.jboss.seam.ScopeType) (line: 2014)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.Component.getInstance(java.lang.String, boolean, boolean) (line: 1986)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.Component.getInstance(java.lang.String, boolean)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo3">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.Namespace.getComponentInstance(java.lang.String, boolean)
<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.Component.getInstanceFromFactory() obtains a lock that has static scope, so nothing else can
invoke getInstanceFromFacotry() while the lock is held.It then blocks on InMemorySessionManager$SessionImpl.bumpTimeout()<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">Meanwhile, the invalidate() method blocks against the static method in getInstanceFromFactory()<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">//EricP<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:undertow-dev-bounces@lists.jboss.org">undertow-dev-bounces@lists.jboss.org</a> [<a href="mailto:undertow-dev-bounces@lists.jboss.org">mailto:undertow-dev-bounces@lists.jboss.org</a>]
<b>On Behalf Of </b>Eric Peters<br>
<b>Sent:</b> Thursday, June 25, 2015 4:39 PM<br>
<b>To:</b> <a href="mailto:undertow-dev@lists.jboss.org">undertow-dev@lists.jboss.org</a><br>
<b>Subject:</b> [undertow-dev] InSessionMemoryManager synchronized methods<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Chasing after another problem I found several blocked task threads, best as I can determine:<o:p></o:p></p>
<p class="MsoNormal">InMemorySessionmanager$SessionImpl.invalidate() is invoked.<o:p></o:p></p>
<p class="MsoNormal">This method is synchronized, and the call blocks inside SesssionListeners.sessionDestroyed() (separate issue there…)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Later, InMemorySessionmanager$SessionImpl.bumpTimeout() is invoked from another thread.<o:p></o:p></p>
<p class="MsoNormal">This method is also synchronized, and blocks waiting for invalidate() to complete. As the first thread is indefinitely blocked inside invalidate(), this second thread also remains blocked indefinitely.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In my environment it appears to make an existing problem slightly more severe.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Found in 1.1.0, but it looks like it’s in both 1.1.7 and the master branch as well.<o:p></o:p></p>
<p class="MsoNormal">Using RHEL, Java 7, Wildfly 8.2<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">invalidate() Thread trace (excerpt):<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">(blocked) - sun.misc.Unsafe.park(boolean, long)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">…<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.contexts.ServletLifecycle.endSession(javax.servlet.http.HttpSession) (line: 187)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.jboss.seam.servlet.SeamListener.sessionDestroyed(javax.servlet.http.HttpSessionEvent) (line: 59)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.core.ApplicationListeners.sessionDestroyed(javax.servlet.http.HttpSession) (line: 264)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.core.SessionListenerBridge.sessionDestroyed(io.undertow.server.session.Session, io.undertow.server.HttpServerExchange, io.undertow.server.session.SessionListener$SessionDestroyedReason)
(line: 67) <o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.SessionListeners.sessionDestroyed(io.undertow.server.session.Session, io.undertow.server.HttpServerExchange, io.undertow.server.session.SessionListener$SessionDestroyedReason)
(line: 61) <o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.InMemorySessionManager$SessionImpl.invalidate(io.undertow.server.HttpServerExchange, io.undertow.server.session.SessionListener$SessionDestroyedReason) (line: 413)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.InMemorySessionManager$SessionImpl.invalidate(io.undertow.server.HttpServerExchange) (line: 399)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.spec.HttpSessionImpl.invalidate() (line: 197)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo6">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">…<o:p></o:p></span></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">bumpTimeout() Thread trace:<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.InMemorySessionManager$SessionImpl.bumpTimeout() (line: 271)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.session.InMemorySessionManager$SessionImpl.getAttribute(java.lang.String) (line: 355)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.util.SavedRequest.tryRestoreRequest(io.undertow.server.HttpServerExchange, javax.servlet.http.HttpSession) (line: 124)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(io.undertow.server.HttpServerExchange) (line: 67)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.security.handlers.SecurityInitialHandler.handleRequest(io.undertow.server.HttpServerExchange) (line: 76)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.handlers.PredicateHandler.handleRequest(io.undertow.server.HttpServerExchange) (line: 43)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(io.undertow.server.HttpServerExchange) (line: 61)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.handlers.PredicateHandler.handleRequest(io.undertow.server.HttpServerExchange) (line: 43)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.handlers.PredicateHandler.handleRequest(io.undertow.server.HttpServerExchange) (line: 43)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(io.undertow.server.HttpServerExchange, io.undertow.servlet.handlers.ServletChain, io.undertow.servlet.handlers.ServletRequestContext,
javax.servlet.ServletRequest, javax.servlet.ServletResponse) (line: 261) <o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(io.undertow.server.HttpServerExchange, io.undertow.servlet.handlers.ServletRequestContext, io.undertow.servlet.handlers.ServletChain,
javax.servlet.DispatcherType) (line: 247) <o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.handlers.ServletInitialHandler.access$000(io.undertow.servlet.handlers.ServletInitialHandler, io.undertow.server.HttpServerExchange, io.undertow.servlet.handlers.ServletRequestContext,
io.undertow.servlet.handlers.ServletChain, javax.servlet.DispatcherType) <o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(io.undertow.server.HttpServerExchange) (line: 166)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.Connectors.executeRootHandler(io.undertow.server.HttpHandler, io.undertow.server.HttpServerExchange) (line: 197)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">io.undertow.server.HttpServerExchange$1.run() (line: 759)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) (line: 1145)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">java.util.concurrent.ThreadPoolExecutor$Worker.run() (line: 615)
<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo9">
<span style="font-size:12.0pt;font-family:"Times New Roman","serif"">java.lang.Thread.run() (line: 745)
<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:12.0pt">
//EricP<span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p align="center" style="text-align:center"><span style="background:white">This message has been scanned for malware by Websense.
</span><a href="http://www.websense.com/"><span style="color:black;background:white">www.websense.com</span></a><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";background:white"><o:p> </o:p></span></p>
<p align="center" style="text-align:center"><span style="background:white">Click <a href="https://www.mailcontrol.com/sr/qFsLDesiAOTGX2PQPOmvUk8LIR8eqmo3fP!Z+Zd24fwdO9XGlCVXypUHpd+quuDmLK9zr65hnE4eRLY+cWrx9g==">
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