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<tt>Hi Rahul,<br>
<br>
<tt><tt>These are great news - <tt>that you <tt>find<tt> a way
to reproduce it. L<tt>et me do it and start debugging.<br>
<br>
<tt>I <tt>really do <tt>appreciate</tt> your effort
in dealing with th<tt>is err<tt>or.<br>
<br>
<tt>Regards,</tt><br>
</tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
<div class="moz-cite-prefix">On 24.07.2015 00:19, Gupta, Rahul
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Hi Bogdan,<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">Almost a month
ago, I have raised the issue regarding the opensips log file
filling up with the following message
<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">ERROR:core:io_watch_del:
BUG - trying to del fd 38 with flags 2 1<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">Now I can
reproduce it every time with the following scenario:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">1)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">UAC and UAS are connected to opensips
proxy with TCP transport<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">2)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Connections looks good<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">3)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><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<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">4)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Now unplug the Ethernet cable on UAC<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">5)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><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<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">6)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">UAS tries another tcp call to the UAC
which is still unplugged<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">7)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">tcp_conn_lists shows the tcp
connection to the UAC and netstat shows the connection in
SYN_SENT state<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">8)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><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.<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">I looked at the
source code and observed the following<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">1)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">When the network cable is plugged in
<o:p></o:p></span></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<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">2)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">When the network cable is unplugged<o:p></o:p></span></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<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">3)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><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.<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">Please look
into this and suggest how can I fix this issue ?<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 Gupta<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><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>
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