From owner-freebsd-stable@freebsd.org Sat Jul 22 10:15:04 2017 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D9430D7C9F5 for ; Sat, 22 Jul 2017 10:15:04 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 7526C749E2; Sat, 22 Jul 2017 10:15:03 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id v6MAEq10028043 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 22 Jul 2017 12:14:52 +0200 (CEST) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: kostikbel@gmail.com Received: from eg.sd.rdtc.ru (eugen@localhost [127.0.0.1]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTP id v6MAElx3036128; Sat, 22 Jul 2017 17:14:48 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: stable/11 r321349 crashing immediately To: Konstantin Belousov References: <201707220542.v6M5ggtP052112@gw.catspoiler.org> <5972E7C5.6070102@grosbein.net> <20170722070529.GP1935@kib.kiev.ua> <5973018B.2050505@grosbein.net> <20170722080012.GR1935@kib.kiev.ua> <59730ECA.7030309@grosbein.net> <20170722095725.GS1935@kib.kiev.ua> Cc: Don Lewis , pz-freebsd-stable@ziemba.us, freebsd-stable@FreeBSD.org From: Eugene Grosbein X-Enigmail-Draft-Status: N1110 Message-ID: <59732597.4010603@grosbein.net> Date: Sat, 22 Jul 2017 17:14:47 +0700 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <20170722095725.GS1935@kib.kiev.ua> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Jul 2017 10:15:05 -0000 On 22.07.2017 16:57, Konstantin Belousov wrote: >>From this description, I would be not even surprised if your machine > load fits into the kstacks cache, despite cache' quite conservative > settings. In other words, almost definitely your machine is not > representative for the problematic load. Something that creates a lot of > short- and middle- lived threads would be. I'm having trouble to imagine a real-world task for today's i386 hardware or virtual machine involving heavy usage of many short/middle-lived threads. Perhaps, you have at least a synthetic benchmark so I could try to reproduce kstack/KVA fragmentation-related problem using my i386 hardware? It has 1G RAM, local 16G CompactFlash (13 GB unpartitioned) as ada0, over 200GB free within local IDE HDD (ada1) and mentioned 2TB USB 2.0 HDD. Pretty many resources for 2007 year AMD Geode system, eh? :-) It runs 11.1-PRERELEASE r318642 currently.