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<p class="MsoNormal"><span style="color:#1F497D">Hi Bogdan, thanks for looking into this issue. Let me know if anyway I can help to get to the bottom of this issue, like providing logs etc<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">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rahul<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Bogdan-Andrei Iancu [mailto:bogdan@opensips.org]
<br>
<b>Sent:</b> Tuesday, July 28, 2015 1:13 PM<br>
<b>To:</b> Gupta, Rahul; users@lists.opensips.org<br>
<b>Subject:</b> Re: ERROR:core:io_watch_del: BUG - trying to del fd 38 with flags 2 1<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><tt><span style="font-size:10.0pt">Hi Rahul,</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
<br>
<tt>These are great news - that you find a way to reproduce it. Let me do it and start debugging.</tt><br>
<br>
<tt>I really do appreciate your effort in dealing with this error.</tt><br>
<br>
<tt>Regards,</tt><br>
<br>
</span><o:p></o:p></p>
<pre>Bogdan-Andrei Iancu<o:p></o:p></pre>
<pre>OpenSIPS Founder and Developer<o:p></o:p></pre>
<pre><a href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a><o:p></o:p></pre>
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<p class="MsoNormal">On 24.07.2015 00:19, Gupta, Rahul wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D">Hi Bogdan,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Almost a month ago, I have raised the issue regarding the opensips log file filling up with the following message
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">ERROR:core:io_watch_del: BUG - trying to del fd 38 with flags 2 1</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Now I can reproduce it every time with the following scenario:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">1)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">UAC and UAS are connected to opensips proxy with TCP transport</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">2)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">Connections looks good</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">3)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">Netstat shows the connection to UAC in ESTABLISHED state and the tcp_conn_lists of opensips also looks fine for that UAC</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">4)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">Now unplug the Ethernet cable on UAC</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">5)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">After tcp connection timeout (set to 5 mins in opensips.cfg), the tcp connection goes away from netstat as well as from tcp_conn_lists</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">6)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">UAS tries another tcp call to the UAC which is still unplugged</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">7)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">tcp_conn_lists shows the tcp connection to the UAC and netstat shows the connection in SYN_SENT state</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">8)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">After the tcp connection timeout (set to 5 mins in opensips.cfg), the connection goes away from netstat however it remains there in tcp_conn_lists and at that moment the “BUG - trying to del fd 38 with flags 2 1” starts printing
in infinite loop.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I looked at the source code and observed the following</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">1)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">When the network cable is plugged in </span><o:p></o:p></p>
<p class="MsoListParagraph"><span style="color:#1F497D">The io_watch_add happens with flag IO_WATCH_READ in tcp_main.c when the command is CONN_NEW</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">2)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">When the network cable is unplugged</span><o:p></o:p></p>
<p class="MsoListParagraph"><span style="color:#1F497D">The io_watch_add happens with flag IO_WATCH_WRITE in tcp_main.c when the command is ASYNC_CONNECT</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">3)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">While doing io_watch_del after timeout, from handle_tcpconn_ev method, io_watch_del always uses IO_WATCH_READ to delete the fd, which gives this error in case of unplugged cable.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Please look into this and suggest how can I fix this issue ?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Rahul Gupta</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoListParagraph"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
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