> 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.
