Date: Tue, 5 Feb 2008 18:00:33 +0100 From: "Attilio Rao" <attilio@freebsd.org> To: "Yar Tikhiy" <yar@comp.chem.msu.su> Cc: Kostik Belousov <kostikbel@gmail.com>, Scot Hetzel <swhetzel@gmail.com>, freebsd-current@freebsd.org, Doug Barton <dougb@freebsd.org> Subject: Re: panic: System call lstat returning with 1 locks held Message-ID: <3bbf2fe10802050900y6c8a90e7t127e88102681d30c@mail.gmail.com> In-Reply-To: <3bbf2fe10802050838p6272edces948789be6b1ddc4b@mail.gmail.com> 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>
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2008/2/5, Attilio Rao <attilio@freebsd.org>: > 2008/2/5, Yar Tikhiy <yar@comp.chem.msu.su>: > > > 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
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