Re: Sendmail eats CPU on r317039 [after -r316874 it may be -r316951 and -r316973 are not enough to fix everything]

I'm currently rebuilding world and kernel on a just completed SVN checkout.

Note that the normal sendmail daemon which listens for incoming traffic
does NOT loop.

The sendmail instance which tries local delivery (echo Hi | mail root) or
the msp_queue instance is looping.

It might be an arm64 specific issue, but a few weeks ago this was not an
issue.

Op di 18 apr. 2017 om 21:15 schreef Mark Millard <markmi_at_dsl-only.net>:

> Ronald Klop ronald-lists at klop.ws wrote on Tue Apr 18 09:59:50 UTC 2017:
>
> > there is a thread ono this list about a problem in syslogd which made
> > syslog-clients (like sendmail busy-looping on logging.
> > That might be related to this. (it is fixed in the source already, so
> > upgrading again might help)
> > See the thread with subject like 'Re: r316958: booting a server takes >10
> > minutes!'
> >
> > Regards,
> >
> > Ronald.
>
>
> Yes. But Tom V.'s report is for -r317039, which is after the reported
> fixes as far as I can tell. Something besides syslogd might also cause
> problems?
>
> In my nearly-default -r317015 ardm64 context [as a VirtualBox guest]
> I've not seen the problem, where I did before. (The only reason sendmail
> runs in my context is for the messages FreeBSD sends to it own local
> accounts. I do not otherwise use mail in this context.)
>
> Tom V.'s report vs. others finding lack of a problem suggests that the
> coverage of the fixes is incomplete somehow but useful. I happen to not
> be doing whatever causes the problem to appear. I've no clue what might
> be different or unusual in Tom V.'s context.
>
> There is also the possibility that Tom V.'s report is a fully independent
> issue. But such does not seem all that likely on the initial information.
>
>
> > On 2017-Apr-17, at 7:57 AM, Mark Millard <markmi at dsl-only.net> wrote:
> >
> >> Just an FYI of a more recent report of runaway sendmail on a
> >> more recent system version ( -r317039 ):
> >>
> >> Begin forwarded message:
> >>
> >>> From: Tom Vijlbrief <tvijlbrief at gmail.com>
> >>> Subject: Sendmail eats CPU on r317039
> >>> Date: April 17, 2017 at 3:39:37 AM PDT
> >>> To: "freebsd-current at freebsd.org" <freebsd-current at freebsd.org>,
> freebsd-arm <freebsd-arm at freebsd.org>
> >>>
> >>> On a recent kernel sendmail is constantly consuming CPU.
> >>>
> >>> truss -p PID
> >>>
> >>> shows:
> >>>
> >>> sendto(3,"<22>Apr 17 10:30:33 sendmail[362"...,163,0x0,NULL,0) ERR#55
> 'No
> >>> buffer space available'
> >>> nanosleep({ 0.000001000 }) = 0 (0x0)
> >>> sendto(3,"<22>Apr 17 10:30:33 sendmail[362"...,163,0x0,NULL,0) ERR#55
> 'No
> >>> buffer space available'
> >>> nanosleep({ 0.000001000 })
> >>> ...
> >>>
> >>> This is on an arm64 system
> >>
> >> Analysis of Tom V.'s context for this may be required.
>
> ===
> Mark Millard
> markmi at dsl-only.net
>
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