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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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