Date: Tue, 13 Aug 2013 12:44:54 -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.2.00.1308131244400.4083@desktop> In-Reply-To: <alpine.BSF.2.00.1308131141240.4083@desktop> 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> <alpine.BSF.2.00.1308131141240.4083@desktop>
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On Tue, 13 Aug 2013, Jeff Roberson wrote: > 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. Please try 254308. It is working for me. Thanks, Jeff > > 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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