Date: Fri, 14 Apr 2017 12:46:39 -0700 From: Peter Wemm <peter@wemm.org> To: Maxim Sobolev <sobomax@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Hiren Panchasara <hiren@freebsd.org> Subject: Re: svn commit: r316874 - head/sys/kern Message-ID: <6942092.OsECkgAp13@overcee.wemm.org> In-Reply-To: <CAH7qZfuxM2pWvPh-LGP8_vrSpm==hTCWjnoZoXSvaFSgAaS8pg@mail.gmail.com> References: <201704141723.v3EHNS3B043902@repo.freebsd.org> <12133324.zHp9vo75vZ@overcee.wemm.org> <CAH7qZfuxM2pWvPh-LGP8_vrSpm==hTCWjnoZoXSvaFSgAaS8pg@mail.gmail.com>
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[-- Attachment #1 --] 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@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@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; > > KI6FJV > > UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246 -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEBgrA0Vr/vfNVuPoUNdaXCeyAngQFAljxJyAACgkQNdaXCeyA ngRplwf/Z34dHsDsqm0Tpqsh9RMxDQNv4ezIMqoId2egNpmIrcXPm4JTBq8/pbTA J+Mi/zotWeDtfmcqtALCr0gQcNBL1ff3kxjWcMngcv7OtSK4JHyvdFUZhuTJIZrg iWklMg7HYinB8RdxLgctMmOMi0/ekn7QbhHoOqbtEGeLmJCTlvF0kmBbq7kqx+Sz 8cluLIS7KQTsr2ffsnfGpLI4Dcy0ycFeFfJ+t2uYdZWMCY1ocLHGKHTd1yXLAErW /p7KjZSXppK4a7ujh5tfvdrT7YPsY0A4wuRT4McPh/ZAIOLwMWXnlsUUUBKB2hZL YqFbimvrSpd4dXoeGNFZ6YtQAJIzog== =oxwE -----END PGP SIGNATURE-----
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