From owner-freebsd-current@FreeBSD.ORG Tue Feb 5 17:00:35 2008 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8F20016A420 for ; Tue, 5 Feb 2008 17:00:35 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.154]) by mx1.freebsd.org (Postfix) with ESMTP id 0C9BC13C46E for ; Tue, 5 Feb 2008 17:00:34 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: by fg-out-1718.google.com with SMTP id 16so2375974fgg.35 for ; Tue, 05 Feb 2008 09:00:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; bh=IhD2nalsAOuDfQ72wVjp+vBPpScdiKlrXEuHlBOO4ag=; b=Q7kKj+q+LLFzofXH4ACa/9WCjWsmge5/2LE6EQ4Pn1eP7YXO5TFrOcdDLrx8etive17m3Q8uzpHp5nLQF4MISJGsRvJ7XXWNLVP2VoTgU8CDyzQP0teM/FlDUG+TFA1w7XRE7BTmbHrTuJnbpg4qjAWU8ED6PGVx7ojXA/KnO+8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=t6dayyo/N4QhHfgsJ22igRPd7j3xnOTZ664fbDiH9V9t7a0WOK6srSdERyqtaTXNg6ZadBknwJqAQQMAeNfcrPNB26CbYCLf/Cfc9WMOvDEFaxpEi2eWSj1n3L037l6L0zaBVTggf/u4wJLoq82tQDly4fhkXe7SwqZ5Uad/s8c= Received: by 10.86.79.19 with SMTP id c19mr8003488fgb.31.1202230833637; Tue, 05 Feb 2008 09:00:33 -0800 (PST) Received: by 10.86.28.19 with HTTP; Tue, 5 Feb 2008 09:00:33 -0800 (PST) Message-ID: <3bbf2fe10802050900y6c8a90e7t127e88102681d30c@mail.gmail.com> Date: Tue, 5 Feb 2008 18:00:33 +0100 From: "Attilio Rao" Sender: asmrookie@gmail.com To: "Yar Tikhiy" In-Reply-To: <3bbf2fe10802050838p6272edces948789be6b1ddc4b@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <3bbf2fe10801291411v302dd33at54ebe538397e8fac@mail.gmail.com> <790a9fff0801301352xa91a69ci3f08488dfcfc982@mail.gmail.com> <3bbf2fe10801310243tddedfeckbc4c94be87f0a4ca@mail.gmail.com> <20080131130210.GA37090@comp.chem.msu.su> <3bbf2fe10801310504j486924bdm86e0436597a42b09@mail.gmail.com> <790a9fff0801312241s346068b6s40fcae71ebbf546@mail.gmail.com> <20080201145051.GE79881@comp.chem.msu.su> <3bbf2fe10802011041t28e419c9n5f0f6f34d6450184@mail.gmail.com> <20080205163602.GB56373@comp.chem.msu.su> <3bbf2fe10802050838p6272edces948789be6b1ddc4b@mail.gmail.com> X-Google-Sender-Auth: 1607345064726890 Cc: Kostik Belousov , Scot Hetzel , freebsd-current@freebsd.org, Doug Barton Subject: Re: panic: System call lstat returning with 1 locks held X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Feb 2008 17:00:35 -0000 2008/2/5, Attilio Rao : > 2008/2/5, Yar Tikhiy : > > > BTW, I seem to be hitting yet another lockmgr-related panic. > > > > My system won't reboot under certain conditions: it'll panic instead > > in vfs_unmountall(). Namely it will panic if I reboot from single-user > > mode while it'll reboot OK from multi-user mode. I have no idea > > yet about the exact reason for the behaviour. The output from kgdb > > attached. > > > > Note that this panic shouldn't be NTFS-related as I can trigger it > > by typing `reboot' immediately after booting into single user. > > > Yes, sorry for this. > I know of this and I alredy patched my tree. > I did the WITNESS stuff based on the assumption drained lock will > never be release while they are. Unmounting is currently the only one > consumer of LK_DRAIN I know of and I just need to do a WITNESS_LOCK() > over there. > I will provide you an updated patch about this problem and another one > found by kris@. > > I will look later at the backtrace so we can go on. More specifically, here is the "fixed" version: http://www.freebsd.org/~attilio/witness_lockmgr2.diff (against stock -CURRENT). Kris and me tested (rather) this version and I found it reliable, so I want to commit to CVS in a couple of hours. If you can add any other feedback to it, I would be very happy. Thanks, Attilio PS: this WITNESS patch reports 3-4 different LORs at boot-time and other 3-4 at shutdown time... -- Peace can only be achieved by understanding - A. Einstein