Date: Tue, 13 Aug 2013 11:42:10 -1000 (HST) From: Jeff Roberson <jroberson@jroberson.net> To: David Wolfskill <david@catwhisker.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, current@freebsd.org Subject: Re: Early drop to debugger with DEBUG_MEMGUARD Message-ID: <alpine.BSF.2.00.1308131141240.4083@desktop> In-Reply-To: <20130813055939.GL1570@albert.catwhisker.org> References: <20130812151314.GE1570@albert.catwhisker.org> <CACYV=-FH6KinGXFkgs6hyuegHtSsMyWusUuv9DHqqgyOQ1_mDg@mail.gmail.com> <20130812160154.GF1570@albert.catwhisker.org> <CACYV=-Fwmvr0c-2rRyfDCJ-G3r_o_qD5tBDn_CGc-sO42Bf=aQ@mail.gmail.com> <20130812214435.GH1570@albert.catwhisker.org> <20130813052944.GX4972@kib.kiev.ua> <20130813055939.GL1570@albert.catwhisker.org>
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On Mon, 12 Aug 2013, David Wolfskill wrote: > On Tue, Aug 13, 2013 at 08:29:44AM +0300, Konstantin Belousov wrote: >> ... >> The r254025 indeed introduced the problem, and Davide pointed out you a >> workaround for the assertion triggering. > > Right; I tried one of those -- I hope I got it right... > >> Proper fix for the memguard requires a policy of M_NEXTFIT or like, to >> avoid a reuse of the previous allocated range as long as possible. That's why I passed a start address as a lower bound to vmem_xalloc. I would like to eventually implement nextfit. > > Ah. > >> But, you have some further issue even after the assertion was silenced, >> isn't it ? I will fix this today and do some stress tests with memguard on. Sorry for the difficulty. Thanks, Jeff > > Yes; please see > <http://docs.FreeBSD.org/cgi/mid.cgi?20130812160154.GF1570>; for a copy > of the message that shows the resulting panic. (Or see previous > messages i this thread, if that's easier.) It looks (from my naive > perspective) as if mti_zone hadn't been initialized (properly? at > all?). > > In any case, I remain willing to test, subject to Internet connectivity > flakiness where I am now and other demands on my time. > > Peace, > david > -- > David H. Wolfskill david@catwhisker.org > Taliban: Evil men with guns afraid of truth from a 14-year old girl. > > See http://www.catwhisker.org/~david/publickey.gpg for my public key. >
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