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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks Serguei,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We are working on RHEL 7.3 and according to the link provided it seems that on 7.3 the highlighted issue should be resolved.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We checked this by running the following command:<o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">rpm -q --changelog kernel-`uname -r` | grep futex | grep ref
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">- [kernel] futex: Mention key referencing differences between shared and private futexes (Larry Woodman) [1205862]</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">- [kernel] futex: Ensure get_futex_key_refs() always implies a barrier (Larry Woodman) [1205862]
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">With Best Regards,</span></i><i><span style="font-size:10.0pt;font-family:"Futura Bk",sans-serif;color:#F79646"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Shelendra Agarwal<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Telco Big Data Analytics<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Communications & Media Solutions
<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Hewlett Packard Enterprise<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="NO-BOK" style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">+91-9945056319<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#4F81BD"><a href="mailto:shelendra.agarwal@hpe.com"><span lang="NO-BOK">shelendra.agarwal@hpe.com</span></a></span></i><span lang="NO-BOK" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> kolos [mailto:serguei.kolos@cern.ch]
<br>
<b>Sent:</b> Sunday, December 09, 2018 8:55 PM<br>
<b>To:</b> Agarwal, Shelendra <shelendra.agarwal@hpe.com><br>
<b>Cc:</b> omniorb-list@omniorb-support.com; Cassis, Ivano <ivano.cassis@hpe.com><br>
<b>Subject:</b> Re: [omniORB] Threads hanging in OMNI ORB 4.2.1 with mutex lock<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have seen similar problem with our SW a couple of years ago which turned out to be caused by a bug<o:p></o:p></p>
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<p class="MsoNormal">in the linux kernel used by RHEL 6. According to the following article the RHEL 7.x systems are also<o:p></o:p></p>
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<p class="MsoNormal">affected by the same issue:<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://www.infoq.com/news/2015/05/redhat-futex">https://www.infoq.com/news/2015/05/redhat-futex</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Serguei<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal">On 7 Dec 2018, at 18:32, Agarwal, Shelendra via omniORB-list <<a href="mailto:omniorb-list@omniorb-support.com">omniorb-list@omniorb-support.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">We are using c++ implementation of OMNI ORB 4.2.1 on RHEL 7.x.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">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></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">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></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">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></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">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></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks in advance for your help!!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">With Best Regards,</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646"> </span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Shelendra Agarwal</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Telco Big Data Analytics</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Communications & Media Solutions</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">Hewlett Packard Enterprise</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span lang="NO-BOK" style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#F79646">+91-9945056319</span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Futura Bk",sans-serif;color:#4F81BD"><a href="mailto:shelendra.agarwal@hpe.com"><span lang="NO-BOK">shelendra.agarwal@hpe.com</span></a></span></i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><2018-12-06-17-50-00_GSTACK.log><2018-12-06-18-00-47_GSTACK.log><span style="font-family:"Helvetica",sans-serif">_______________________________________________<br>
omniORB-list mailing list<br>
</span><a href="mailto:omniORB-list@omniorb-support.com"><span style="font-family:"Helvetica",sans-serif;color:#954F72">omniORB-list@omniorb-support.com</span></a><span style="font-family:"Helvetica",sans-serif"><br>
</span><a href="http://www.omniorb-support.com/mailman/listinfo/omniorb-list"><span style="font-family:"Helvetica",sans-serif;color:#954F72">http://www.omniorb-support.com/mailman/listinfo/omniorb-list</span></a><o:p></o:p></p>
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