panic: System call lstat returning with 1 locks held

[Attilio Rao]

2008/1/29, Attilio Rao <attilio at freebsd.org>:
> 2008/1/29, Doug Barton <dougb at freebsd.org>:
> > Attilio Rao wrote:
> > > 2008/1/27, Doug Barton <dougb at freebsd.org>:
> > >> Attilio Rao wrote:
> > >>
> > >>> As my really first commit about VFS happened on 28 december (and it
> > >>> should also be a nop), and you reported a 23 december kernel, it seems
> > >>> like the problem was alredy there by time.
> > >> Ok, so you're off the hook. :) Interested in helping track down why
> > >> it's panic'ing?
> > >
> > > Sure, I'm testing a patch which instruments lockmgr with ktr and
> > > witness support.
> > > I will post later in the day in order to make consumer-available.
> >
> > ok. FYI I tried torture-testing it today, and thing are looking a
> > little better. It only paniced once, with the same message as in the
> > subject but it was stat, not lstat. Unfortunately it didn't actually
> > do the dump, so I don't have a backtrace. If I can get it to
> > panic&dump I'll let you know.
>
> Which fs? always NTFS?
> I'm committing my WITNESS patch now to perforce so that other people
> can hopefully stress-test it before to be committed.

BTW, I've just found a bug in lockmgr() which could produce such
results, but it should be an old-standing one.

More infos to follow.

Attilio


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