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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/IDP" style="color: #3b73af; text-decoration: none">Identity Provider</a> / <a href="https://issues.shibboleth.net/jira/browse/IDP-1744" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-e7f4aba2-af3f-43f5-9b1c-e0d7c0e25601" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://issues.shibboleth.net/jira/browse/IDP-1744" style="color: #3b73af; text-decoration: none">IDP-1744</a> </td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/IDP-1744" style="color: #3b73af; text-decoration: none">Unable to acquire conversation lock</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-e7f4aba2-af3f-43f5-9b1c-e0d7c0e25601" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="tzeller@shibboleth.net" id="email_tzeller@shibboleth.net" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=tzeller%40shibboleth.net" style="color:#0052cc;; color: #3b73af; text-decoration: none">Tom Zeller</a> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 02/Feb/21 6:51 PM </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="irifkin@brandeis.edu" id="email_irifkin@brandeis.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=irifkin%40brandeis.edu" style="color:#0052cc;; color: #3b73af; text-decoration: none">Ian P</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Hello,</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Yesterday and again today we've had production issues with our environment. Is this is an OK place to ask a troubleshooting question?</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have 4 load balanced Shib IdP VMs (in two physical sites). We have been running shib for years and it is typically quite stable. Each VM has 3GB RAM</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The shib servers point to a load balanced LDAP URL. There are two LDAP servers behind the load balancer. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">On each shib server we have tomcat running the IDP with an apache proxy in front. Yesterday we started hearing about user's getting 500 errors. Apache was complaining about a ajp timeout reaching tomcat/shib.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Interestingly this occurred on shib servers 1, 3, and 4 (vm #2 was fine).</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">One thing that stands out in the logs is the "Unable to acquire conversation lock after 30 seconds" warning that seems to match the time of the problem. Once it starts failing the CPU spikes and might eventually get a Java head memory error.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Restarting the service would work for 1-2 minutes then it would start failing again. As we tried to investigate and restart the service again it eventually started working without the issue re-occurring.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Unfortunately this morning the issue re-occurred on shib servers 2, 3, 4. This time I saw the "Unable to acquire conversation lock" error on 2 and 3 but not 4. Shib VM 4 today was weirder in that it looks like it died processing requests (without an error?) at around 9:28 then a thread work up and tried to do something at 9:40 and then fell over.<br> <br> There have been no recent config changes to Shib IdP or LDAP.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We have not seen errors from other systems with LDAP. So far nothing looks unusual in LDAP logs.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Can you provide any guidance?</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Thank you,<br> Ian Rifkin</p> </td>
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