svn commit: r316874 - head/sys/kern

[Peter Wemm]

On Friday, April 14, 2017 12:41:52 PM Maxim Sobolev wrote:
> Thanks, Peter. I will try to look into this asap.

I don't understand what is going on yet. Presumably there must be other 
changes in play that affect udp/select sometime between the original 2015 
change and this. The syslogd -s code is Old(TM).  I'm also wondering whether 
the -s code even works at all since the 2015 / r285910 change...

> -Max
> 
> On Apr 14, 2017 12:32 PM, "Peter Wemm" <peter at wemm.org> wrote:
> > On Friday, April 14, 2017 11:49:26 AM Peter Wemm wrote:
> > > On Friday, April 14, 2017 05:23:28 PM Maxim Sobolev wrote:
> > > > Author: sobomax
> > > > Date: Fri Apr 14 17:23:28 2017
> > > > New Revision: 316874
> > > > URL: https://svnweb.freebsd.org/changeset/base/316874
> > > > 
> > > > Log:
> > > >   Restore ability to shutdown DGRAM sockets, still forcing ENOTCONN to
> > 
> > be
> > 
> > > > returned by the shutdown(2) system call. This ability has been lost as
> > > > part
> > > > of the svn revision 285910.
> > > > 
> > > >   Reviewed by:      ed, rwatson, glebius, hiren
> > > >   MFC after:        2 weeks
> > > >   Differential Revision:    https://reviews.freebsd.org/D10351
> > > 
> > > This appears to have broken syslogd and had a major change in behavior
> > 
> > with
> > 
> > > regards to select(2).
> > > 
> > > If you run syslogd with the -s flag (which is default), it now spins at
> > 
> > 100%
> > 
> > > cpu as all the shutdown sockets now return readable from select.
> > > 
> > > Old releases / jails also manifest this behavor.  If it wasn't for
> > > losing
> > > the ability to run old branch binaries I'd suggest changing syslogd
> > > instead, but we depend on this in the cluster and I expect others do
> > > too.
> > > 
> > > I'm not 100% certain that this change is the culprit but a heads-up
> > > can't
> > > hurt. I'll try reverting it on the freebsd cluster next, after fixing
> > > the
> > > broken auditing changes.
> > > 
> > > -Peter
> > 
> > I can confirm that reverting r316874 fixes syslogd and backwards
> > compatability
> > with old branches.
> > 
> > --
> > Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com;
> > KI6FJV
> > UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246

-- 
Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com; KI6FJV
UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246
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