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@stunnel.org] On Behalf Of Murrey, Brian J. Sent: Wednesday, October 17, 2018 11:09 AM To: stunnel-users@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@stelvio.com mailto:vdeschenes@stelvio.com > Sent: Wednesday, October 17, 2018 2:05 PM To: Murrey, Brian J. <Brian.Murrey@trimedx.com mailto:Brian.Murrey@trimedx.com >; stunnel-users@stunnel.org mailto:stunnel-users@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@stunnel.org mailto:stunnel-users-bounces@stunnel.org > On Behalf Of Murrey, Brian J. Sent: Wednesday, 17 October 2018 1:57 PM To: stunnel-users@stunnel.org mailto:stunnel-users@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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Eric Eberhard