[stunnel-users] CPU 100%

Thu Oct 18 02:03:42 CEST 2018

One other suggestion - run it in inetd mode.  This is MUCH simpler, stunnel
will not have to do as much forking and managing and so forth.  The O/S will
do all that.  I know - it is a little less efficient.  However, I have found
on modern Centos and AIX computers that even with very high volumes it makes
no measurable difference.  If nothing else, it is another debugging
technique.  Especially if the runaway process is the parent process .
because that does not exist under inetd mode.

Eric

From: stunnel-users [mailto:stunnel-users-bounces at stunnel.org] On Behalf Of
Murrey, Brian J.
Sent: Wednesday, October 17, 2018 11:09 AM
To: stunnel-users at stunnel.org
Subject: Re: [stunnel-users] CPU 100%

We have one service, connecting stunnel to another application. Relevant
configuration:

[vpn]

client = no

accept = 172.17.102.122:443

exec = /usr/sbin/ppp

execargs = ppp -direct vpn

pty = yes

Brian

From: Vincent Deschenes <vdeschenes at stelvio.com
<mailto:vdeschenes at stelvio.com> > 
Sent: Wednesday, October 17, 2018 2:05 PM
To: Murrey, Brian J. <Brian.Murrey at trimedx.com
<mailto:Brian.Murrey at trimedx.com> >; stunnel-users at stunnel.org
<mailto:stunnel-users at stunnel.org> 
Subject: RE: [stunnel-users] CPU 100%

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?

Vincent Deschenes Ing. PMP

From: stunnel-users <stunnel-users-bounces at stunnel.org
<mailto:stunnel-users-bounces at stunnel.org> > On Behalf Of Murrey, Brian J.
Sent: Wednesday, 17 October 2018 1:57 PM
To: stunnel-users at stunnel.org <mailto:stunnel-users at stunnel.org> 
Subject: [stunnel-users] CPU 100%

We are running stunnel 5.49 on FreeBSD 11.2 and we're running into a problem
once in a while. 

CPU pegs at 100% when we get an stunnel connection from one of our external
devices. 

This affects 100% of all cores and we can't even log in to console.

To mitigate this temporarily, we have a script running in the background to
watch when stunnel begins to spike and restarts the daemon.

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. 

Have any of you run in to this issue? 

Sincerely, 

Brian Murrey
System Engineer II, IT Infrastructure

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