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<p class="MsoNormal">We have one service, connecting stunnel to another application. Relevant configuration:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[vpn]<o:p></o:p></p>
<p class="MsoNormal">client = no<o:p></o:p></p>
<p class="MsoNormal">accept = 172.17.102.122:443<o:p></o:p></p>
<p class="MsoNormal">exec = /usr/sbin/ppp<o:p></o:p></p>
<p class="MsoNormal">execargs = ppp -direct vpn<o:p></o:p></p>
<p class="MsoNormal">pty = yes<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Brian<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Vincent Deschenes <vdeschenes@stelvio.com> <br>
<b>Sent:</b> Wednesday, October 17, 2018 2:05 PM<br>
<b>To:</b> Murrey, Brian J. <Brian.Murrey@trimedx.com>; stunnel-users@stunnel.org<br>
<b>Subject:</b> RE: [stunnel-users] CPU 100%<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-CA">Just a silly idea, but is it possible you have a re-entrant configuration for one service, one that connect back to itself creating a loop?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Courier New"">Vincent Deschenes Ing. PMP<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> stunnel-users <<a href="mailto:stunnel-users-bounces@stunnel.org">stunnel-users-bounces@stunnel.org</a>>
<b>On Behalf Of </b>Murrey, Brian J.<br>
<b>Sent:</b> Wednesday, 17 October 2018 1:57 PM<br>
<b>To:</b> <a href="mailto:stunnel-users@stunnel.org">stunnel-users@stunnel.org</a><br>
<b>Subject:</b> [stunnel-users] CPU 100%<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal">We are running stunnel 5.49 on FreeBSD 11.2 and we’re running into a problem once in a while.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">CPU pegs at 100% when we get an stunnel connection from one of our external devices.
<o:p></o:p></p>
<p class="MsoNormal">This affects 100% of all cores and we can’t even log in to console.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To mitigate this temporarily, we have a script running in the background to watch when stunnel begins to spike and restarts the daemon.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It doesn’t happen 100% of the time, and so far I have been unable to distinguish what makes the connection do this to the CPU.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Have any of you run in to this issue? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sincerely, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Brian Murrey<br>
System Engineer II, IT Infrastructure<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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