<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi<div class=""><br class=""></div><div class="">I have seen similar problem with our SW a couple of years ago which turned out to be caused by a bug</div><div class="">in the linux kernel used by RHEL 6. According to the following article the RHEL 7.x systems are also</div><div class="">affected by the same issue:</div><div class=""><a href="https://www.infoq.com/news/2015/05/redhat-futex" class="">https://www.infoq.com/news/2015/05/redhat-futex</a></div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Serguei<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 7 Dec 2018, at 18:32, Agarwal, Shelendra via omniORB-list <<a href="mailto:omniorb-list@omniorb-support.com" class="">omniorb-list@omniorb-support.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Hi,<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">We are using c++ implementation of OMNI ORB 4.2.1 on RHEL 7.x.<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">We have a process that sometime hangs and stops responding to other processes for CORBA calls. We collected the gstack of the process and from the thread dumps we see most of the threads are in omni_mutex_lock::omni_mutex_lock condition.<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">We collected multiple snaps of gstack and we see that there is no changes happening over a period of time. Attached are 2 snaps taken 10 minutes apart.<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">We understand that threads are waiting for some resources but we are unable to understand which resource. May be they are in kind of deadlock state waiting for each other or something else, can you please throw some lights?<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">We noted that omniTransportLock is often involved in many mutex locks in the thread dump. Are there any details about this omniTransportLock not being released available?<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Thanks in advance for your help!!<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class="">With Best Regards,</span></i><i class=""><span style="font-size: 10pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class=""><o:p class=""></o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class=""><o:p class=""> </o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class="">Shelendra Agarwal<o:p class=""></o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class="">Telco Big Data Analytics<o:p class=""></o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class="">Communications & Media Solutions<o:p class=""></o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class="">Hewlett Packard Enterprise<o:p class=""></o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span lang="NO-BOK" style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(247, 150, 70);" class="">+91-9945056319<o:p class=""></o:p></span></i></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><i class=""><span style="font-size: 9pt; font-family: "Futura Bk", sans-serif; color: rgb(79, 129, 189);" class=""><a href="mailto:shelendra.agarwal@hpe.com" style="color: rgb(149, 79, 114); text-decoration: underline;" class=""><span lang="NO-BOK" style="color: blue;" class="">shelendra.agarwal@hpe.com</span></a></span></i><span lang="NO-BOK" style="color: rgb(31, 73, 125);" class=""><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><span id="cid:925EDAB8-3254-4A15-962E-23835B8EABDC@numericable.fr"><2018-12-06-17-50-00_GSTACK.log></span><span id="cid:F8816EF0-A6C3-4A6F-95A9-DB48CFF026AC@numericable.fr"><2018-12-06-18-00-47_GSTACK.log></span><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; 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